Patent Publication Number: US-2022222966-A1

Title: Imaging apparatus, imaging method, and program

Description:
FIELD 
     The present disclosure relates to an imaging apparatus, an imaging method, and a program. 
     BACKGROUND 
     Personal authentication using biometric information such as a fingerprint pattern, which is information unique to an individual, has become very important technology for protecting individual rights, assets, and the like in a network society. In particular, in electronic commerce, by performing personal authentication using biometric information such as a fingerprint pattern instead of inputting a password, user convenience is improved while high security is ensured. As an example of such technology, technology disclosed in Patent Literature 1 below can be mentioned. 
     CITATION LIST 
     Patent Literature 
     
         
         Patent Literature 1: JP 2017-196319 A 
       
    
     SUMMARY 
     Technical Problem 
     In recent years, in order to enable the personal authentication using the biometric information such as the fingerprint pattern in all situations of daily life, downsizing of a sensor (imaging apparatus) that acquires an image related to the biometric information such as the fingerprint pattern is strongly required. Furthermore, even in a case where the sensor is downsized, it is also required to acquire a high-quality image such as the fingerprint pattern in order to accurately perform the personal authentication. 
     Accordingly, in view of the above circumstances, the present disclosure proposes a new and improved imaging apparatus that can acquire a high-quality image and can realize downsizing, an imaging method, and a program. 
     Solution to Problem 
     For solving the problem described above, an imaging apparatus according to one aspect of the present disclosure has an irradiation unit that irradiates a subject with light; an imaging unit that images the subject a plurality of times; a control unit that controls the imaging unit and the irradiation unit; and a combination unit that combines a plurality of imaged images obtained by the imaging unit, wherein the imaging unit has a plurality of imaging elements disposed in a matrix when viewed from the side of the subject, the irradiation unit has a plurality of light emitting elements provided so as to correspond to the plurality of imaging elements, and the control unit controls the irradiation unit so as to turn on the plurality of light emitting elements different for each imaging among the plurality of light emitting elements, and controls the imaging unit so as to drive the plurality of imaging elements corresponding to the plurality of light emitting elements that are not turned on. 
     An imaging method using an imaging apparatus according to one aspect of the present disclosure, the imaging method, the imaging apparatus including an irradiation unit that irradiates a subject with light, an imaging unit that images the subject a plurality of times, a control unit that controls the imaging unit and the irradiation unit, and a combination unit that combines a plurality of imaged images obtained by the imaging unit, the imaging unit having a plurality of imaging elements disposed in a matrix when viewed from the side of the subject, the irradiation unit having a plurality of light emitting elements provided so as to correspond to the plurality of imaging elements, comprises turning on the plurality of light emitting elements different for each imaging among the plurality of light emitting elements; and driving the plurality of imaging elements corresponding to the plurality of light emitting elements that are not turned on. 
     A program for causing a computer to realize control of an imaging apparatus according to one aspect of the present disclosure, the imaging apparatus including an irradiation unit that irradiates a subject with light, an imaging unit that images the subject a plurality of times, a control unit that controls the imaging unit and the irradiation unit, and a combination unit that combines a plurality of imaged images obtained by the imaging unit, the imaging unit having a plurality of imaging elements disposed in a matrix when viewed from the side of the subject, the irradiation unit having a plurality of light emitting elements provided so as to correspond to the plurality of imaging elements, causes a computer to function as: a function of turning on the plurality of light emitting elements different for each imaging among the plurality of light emitting elements; and a function of driving the plurality of imaging elements corresponding to the plurality of light emitting elements that are not turned on. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a diagram illustrating an example of a form of an authentication device  10  according to a first embodiment of the present disclosure. 
         FIG. 2  is a block diagram illustrating a functional configuration example of the authentication device  10  according to the first embodiment. 
         FIG. 3  is an (first) explanatory diagram for explaining a configuration example of a part of the authentication device  10  according to the first embodiment. 
         FIG. 4  is an (second) explanatory diagram for explaining a configuration example of a part of the authentication device  10  according to the first embodiment. 
         FIG. 5  is a diagram illustrating a flowchart of an authentication method according to the first embodiment. 
         FIG. 6  is an explanatory diagram for explaining an operation example of the authentication device  10  according to the first embodiment. 
         FIG. 7  is an (first) explanatory diagram for explaining an operation example of an authentication device  10  according to a modification of the first embodiment. 
         FIG. 8  is an (second) explanatory diagram for explaining an operation example of an authentication device  10  according to a modification of the first embodiment. 
         FIG. 9  is an (third) explanatory diagram for explaining an operation example of an authentication device  10  according to a modification of the first embodiment. 
         FIG. 10  is an (fourth) explanatory diagram for explaining an operation example of an authentication device  10  according to a modification of the first embodiment. 
         FIG. 11  is an (fifth) explanatory diagram for explaining an operation example of an authentication device  10  according to a modification of the first embodiment. 
         FIG. 12  is an (sixth) explanatory diagram for explaining an operation example of an authentication device  10  according to a modification of the first embodiment. 
         FIG. 13  is an (seventh) explanatory diagram for explaining an operation example of an authentication device  10  according to a modification of the first embodiment. 
         FIG. 14  is an (eighth) explanatory diagram for explaining an operation example of an authentication device  10  according to a modification of the first embodiment. 
         FIG. 15  is an (ninth) explanatory diagram for explaining an operation example of an authentication device  10  according to a modification of the first embodiment. 
         FIG. 16  is an (tenth) explanatory diagram for explaining an operation example of an authentication device  10  according to a modification of the first embodiment. 
         FIG. 17  is an (eleventh) explanatory diagram for explaining an operation example of an authentication device  10  according to a modification of the first embodiment. 
         FIG. 18  is an (twelfth) explanatory diagram for explaining an operation example of an authentication device  10  according to a modification of the first embodiment. 
         FIG. 19  is an (thirteenth) explanatory diagram for explaining an operation example of an authentication device  10  according to a modification of the first embodiment. 
         FIG. 20  is an (fourteenth) explanatory diagram for explaining an operation example of an authentication device  10  according to a modification of the first embodiment. 
         FIG. 21  is an (fifteenth) explanatory diagram for explaining an operation example of an authentication device  10  according to a modification of the first embodiment. 
         FIG. 22  is an explanatory diagram for explaining an operation example of an authentication device  10  according to a second embodiment of the present disclosure. 
         FIG. 23  is an (first) explanatory diagram for explaining a configuration example of a part of an authentication device  10  according to a third embodiment of the present disclosure. 
         FIG. 24  is an (second) explanatory diagram for explaining a configuration example of a part of the authentication device  10  according to the third embodiment. 
         FIG. 25  is an (first) explanatory diagram for explaining a configuration example of a part of an authentication device  10  according to a modification of the third embodiment. 
         FIG. 26  is an (second) explanatory diagram for explaining a configuration example of a part of an authentication device  10  according to a modification of the third embodiment. 
         FIG. 27  is an explanatory diagram for explaining an operation example of an authentication device  10  according to a fourth embodiment of the present disclosure. 
         FIG. 28  is an explanatory diagram for explaining a configuration example of a part of an authentication device  10  according to a fifth embodiment of the present disclosure. 
         FIG. 29  is an explanatory diagram for explaining an operation example of the authentication device  10  according to the fifth embodiment. 
         FIG. 30  is an explanatory diagram for explaining a configuration example of a part of an authentication device  10  according to a sixth embodiment of the present disclosure. 
         FIG. 31  is an explanatory diagram for explaining a configuration example of a part of an authentication device  10  according to a seventh embodiment of the present disclosure. 
         FIG. 32  is an explanatory diagram for explaining a configuration example of a part of an authentication device  10  according to a modification of the seventh embodiment. 
         FIG. 33  is an explanatory diagram for explaining an operation example of the authentication device  10  according to the seventh embodiment. 
         FIG. 34  is an explanatory diagram illustrating an example of a hardware configuration of an information processing apparatus  900  according to an embodiment of the present disclosure. 
         FIG. 35  is an explanatory diagram for explaining a configuration example of a part of an authentication device  10   a  according to a comparative example. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Note that, in the present specification and the drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted. Further, in the present specification and the drawings, similar components of different embodiments may be distinguished by adding different alphabets after the same reference numerals. However, when it is unnecessary to particularly distinguish each of the similar components, only the same reference numeral is assigned. 
     Note that, in the following description, a person who performs personal authentication using an authentication device according to an embodiment of the present disclosure to be described later is referred to as a user. 
     Further, in the following description, a pattern appearing on a part of a body of the user means, for example, a fingerprint pattern appearing on a fingertip of the user or a vein pattern of various places (a fingertip, a face, and the like) of the body of the user. Further, the fingerprint pattern refers to a pattern formed by a line (ridge) in which an opening of a sweat gland on a surface of a skin on the inner side of the distal end side (fingertip) from a first joint of a finger is raised. The vein pattern refers to a pattern formed by a blood vessel that returns blood from a distal end portion of the body or the like to a heart. Further, in the following description, feature point information of the pattern or feature information of a part of the pattern means information of the pattern or information including information of the feature point included in the pattern. 
     Further, in the following description, the feature point refers to an element that characterizes the pattern. For example, the feature point in the fingerprint pattern refers to attribute information such as a shape, a direction, and a position (relative coordinates) with respect to a center point of the fingerprint pattern, a branch point of the ridge, an intersection, and an end point (referred to as a minutia). Further, the feature point may be attribute information such as a shape, a direction, a width, an interval, and a distribution density of the ridges. Further, in the following description, the distribution of the feature points, that is, the number or distribution density (distribution information) of the feature points is referred to as a feature amount. 
     Note that the description will be given in the following order.
         1. Background until embodiments of present disclosure are created   2. First Embodiment   2.1 Form of authentication device  10     2.2 Functional configuration example of authentication device  10     2.3 Detailed configuration around fingerprint sensor unit  104     2.4 Authentication method   2.5 Modification   3. Second Embodiment   4. Third Embodiment   4.1 Detailed configuration around fingerprint sensor unit  104     4.2 Modification   5. Fourth Embodiment   6. Fifth Embodiment   7. Sixth Embodiment   8. Seventh Embodiment   9. Application   10. Summary   11. Hardware configuration   12. Supplement       

     1. Background Until Embodiments of Present Disclosure are Created 
     First, before describing the details of the embodiments of the present disclosure, a background until the embodiments of the present disclosure are created by the present inventors will be described with reference to  FIG. 35 .  FIG. 35  is an explanatory diagram for explaining a configuration example of a part of an authentication device  10   a  according to a comparative example. Here, the comparative example means a configuration of the authentication device  10   a  intensively studied by the present inventors before creating the embodiments of the present disclosure. 
     Meanwhile, as described above, in recent years, for example, downsizing is strongly required for a sensor (imaging apparatus) for acquiring a fingerprint pattern (subject) and the like. Furthermore, in order to accurately perform personal authentication even when the sensor is downsized, the sensor is also required to acquire a high-quality image such as a fingerprint pattern. 
     The authentication device (imaging apparatus)  10   a  according to the comparative example capable of acquiring an image of a fingerprint pattern and performing authentication is configured as illustrated in  FIG. 35 , for example. Specifically, the authentication device  10   a  has a light guide plate  160  having a placement surface  90  on which a fingertip  600  of a user is placed, and a display unit  100  that is provided below (lower side in the drawing) the light guide plate  160  and displays guidance information for guiding the fingertip  600  of the user to the placement surface  90  for fingerprint authentication. Further, the authentication device  10   a  has a fingerprint sensor unit  104  that is provided below the display unit  100  and images a fingerprint pattern of the fingertip  600 , and a lens unit  110  that guides light reflected by a surface of the fingertip  600  to the fingerprint sensor unit  104 . Further, the authentication device  10   a  has a touch sensor unit  102  that is provided so as to surround the lens unit  110  and the fingerprint sensor unit  104  when viewed from above the placement surface  90  (in other words, when the placement surface  90  is viewed from a direction from the top to the bottom in the drawing), and senses a contact state as to whether or not the fingertip  600  of the user is properly in contact with the placement surface  90 . In the authentication device  10   a , an irradiation unit  162  that irradiates the surface of the fingertip  600  of the user with light is provided so as to surround the light guide plate  160  when viewed from above the placement surface  90 . 
     As can be seen from  FIG. 35 , in the authentication device  10   a  according to the comparative example, the irradiation unit  162  that irradiates the surface of the fingertip  600  with light and the light guide plate  160  that guides the light from the irradiation unit  162  to the fingertip  600  and guides the light reflected by the fingertip  600  to the fingerprint sensor unit  104  are required. Therefore, in the comparative example, the configuration of the authentication device  10   a  becomes complicated, and it is difficult to downsize the authentication device  10   a.    
     Further, in the comparative example, since the irradiation unit  162  is provided so as to surround the light guide plate  160 , a region on the surface of the fingertip  600  close to the irradiation unit  162  is strongly irradiated with light, so that the image of the fingerprint pattern in the region has high brightness. On the other hand, in the region on the surface of the fingertip  600  far from the irradiation unit  162 , light is weakly applied according to a distance from the irradiation unit  162 , so that the image of the fingerprint pattern in the region has low brightness. Therefore, in the comparative example, since the brightness tends to vary in the image of the fingerprint pattern, it is difficult to acquire a high-quality uniform image for authentication. 
     Therefore, in view of such a situation, the present inventors have intensively studied an authentication device that can be downsized and can acquire a high-quality image. In addition, in the course of the study, the present inventors have independently focused on using a transparent organic light emitting diode (OLED) device including a transparent organic electro luminescence (EL) element having both a function of displaying (emitting light) and a function of transmitting light. Specifically, the present inventors have independently created an authentication device according to an embodiment of the present disclosure that can be downsized and can acquire a high-quality image by using the display unit  100  including a transparent OLED device instead of the display unit  100 , the irradiation unit  162 , and the light guide plate  160 . Hereinafter, details of embodiments of the present disclosure created by the present inventors will be sequentially described. 
     2. First Embodiment 
     &lt;2.1 Form of Authentication Device  10 &gt; 
     First, an example of a form of an authentication device  10  according to a first embodiment of the present disclosure will be described with reference to  FIG. 1 .  FIG. 1  is a diagram illustrating an example of a form of the authentication device  10  according to the present embodiment. The authentication device  10  according to the present embodiment can have a form as a wearable terminal used by being worn on a body of a user, for example. For example, the authentication device  10  may be a device that has a shape of a wristwatch type, a ring type, a collar type, an earphone type, or the like and can be worn on a part of a measured person such as a wrist, an arm, a neck, or an ear. Further, the authentication device  10  may be a device that has a pad shape such as an adhesive plaster and can be attached to a part of the body of the user such as a hand, an arm, a neck, and a leg. 
     For example, as illustrated in  FIG. 1 , the authentication device  10  can have a form of a wristwatch type having a belt-like wristband. Specifically, the authentication device  10  has a belt-like band portion  150 , a display unit  100  provided on a part of the outer periphery of the band portion  150 , and a touch sensor unit  102  provided to overlap with a part of the display unit  100 . Further, the authentication device  10  can have a fingerprint sensor unit  104  provided so as to overlap with a part of the display unit  100 . In addition, although not illustrated, a control unit  200  (see  FIG. 2 ) or the like that controls the operation of the authentication device  10  may be provided inside the band portion  150 . Note that details of the functional units of the authentication device  10  will be described later. 
     Furthermore, in the present embodiment, the authentication device  10  is not limited to the wearable terminal illustrated in  FIG. 1 , and may be a mobile terminal such as a smartphone, a mobile phone, a notebook personal computer (PC), a laptop PC, or a camera carried by the user. Alternatively, in the present embodiment, the authentication device  10  may be a stationary terminal such as a desktop PC, a security device installed at a gate or a door, and a server device that provides various medical devices, supplements, cosmetics, and the like. 
     &lt;2.2 Functional Configuration Example of Authentication Device  10 &gt; 
     The form of the authentication device  10  according to the present embodiment has been described above. Next, an example of a functional configuration of the authentication device  10  according to the present embodiment will be described with reference to  FIG. 2 .  FIG. 2  is a block diagram illustrating a functional configuration example of the authentication device  10  according to the present embodiment. As illustrated in  FIG. 2 , the authentication device  10  mainly has the display unit (irradiation unit)  100 , the fingerprint sensor unit (imaging unit)  104 , and the control unit  200 . Hereinafter, each functional unit included in the authentication device  10  will be described. 
     (Display Unit  100 ) 
     The display unit  100  can display guidance information for guiding a fingertip of the user (a part of the body of the user) (subject)  600  to a placement surface  90  (see  FIG. 3 ) for fingerprint authentication under the control of the control unit  200  described later. Further, the display unit  100  can function as an irradiation unit that irradiates the fingertip  600  of the user with light at the time of acquiring a fingerprint pattern of the fingertip  600  placed on the placement surface  90 . The display unit  100  can include, for example, a transparent OLED device having a plurality of transparent organic EL elements (light emitting elements)  100   a  (see  FIG. 4 ) disposed in a matrix when viewed from above the placement surface  90 , that is, when viewed from the side of the subject. Note that a detailed configuration of the display unit  100  will be described later. 
     (Fingerprint Sensor Unit  104 ) 
     The fingerprint sensor unit  104  is provided below the display unit  100  so as to overlap with the display unit  100 , for example, and can acquire an image of a fingerprint pattern (subject) of the fingertip  600  of the user placed on the placement surface  90 . In the present embodiment, the fingerprint sensor unit  104  can be an optical fingerprint sensor that detects reflected light generated when the fingertip  600  is placed on the placement surface  90  and acquires a fingerprint pattern, and has, for example, a micro lens array (MLA) (micro lens array unit), which is an example of a lens array, and a plurality of imaging elements  104   a  (see  FIG. 4 ) disposed in a matrix when viewed from above the placement surface  90 . Note that a detailed configuration of the fingerprint sensor unit  104  will be described later. 
     (Control Unit  200 ) 
     The control unit  200  can guide the fingertip  600  of the user to an appropriate position on the placement surface  90  for fingerprint authentication, and can perform authentication of the user by the fingerprint in cooperation with the fingerprint sensor unit  104 . The control unit  200  is realized by, for example, a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), and the like. Specifically, as illustrated in  FIG. 2 , the control unit  200  mainly has an imaging control unit  202 , a data combination unit  204 , an authentication unit  206 , an output control unit  208 , and a storage unit  210 . Hereinafter, each functional block included in the control unit  200  will be described. 
     —Imaging Control Unit  202 — 
     The imaging control unit  202  performs drive control related to the display unit  100  and the fingerprint sensor unit  104 , and executes acquisition of an image of a fingerprint pattern by the fingerprint sensor unit  104 . For example, the imaging control unit  202  controls the plurality of transparent organic EL elements (light emitting elements)  100   a  (see  FIG. 4 ) of the display unit  100  such that the plurality of transparent organic EL elements  100   a  different for each imaging are turned on. Further, at this time, the imaging control unit  202  controls the plurality of remaining transparent organic EL elements  100   a  not turned on such that the plurality of transparent organic EL elements  100   a  not turned on transmit light. Furthermore, the imaging control unit  202  drives the plurality of imaging elements  104   a  (see  FIG. 4 ) corresponding to the plurality of transparent organic EL elements  100   a  not turned on. More specifically, the imaging control unit  202  controls the plurality of imaging elements  104   a  so as to drive the plurality of imaging elements  104   a  overlapping with the plurality of transparent organic EL elements  100   a  not turned on when viewed from above the placement surface  90 . Further, at the time of performing control, the imaging control unit  202  may properly refer to various programs, parameters, databases, or the like recorded in the storage unit  210  described later. 
     —Data Combination Unit  204 — 
     The data combination unit  204  acquires images of fingerprint patterns of a plurality of users from the fingerprint sensor unit  104  described above, combines the images into one image, and outputs the image to the authentication unit  206  described later. Furthermore, the data combination unit  204  may output the combined image to the storage unit  210  described later. Note that the data combination unit  204  may perform predetermined processing on the image of the fingerprint pattern acquired from the fingerprint sensor unit  104  or the combined image to perform emphasis, noise removal, or the like of the fingerprint pattern. More specifically, the data combination unit  204  can use, for example, various filters for smoothing and noise removal such as a moving average filter, a difference filter, a median filter, or a Gaussian filter. Furthermore, the data combination unit  204  may use, for example, various algorithms for binarization and thinning. 
     —Authentication Unit  206 — 
     The authentication unit  206  can authenticate the user on the basis of feature information of the fingerprint pattern obtained from the combined image of the fingerprint pattern combined by the data combination unit  204 . For example, the authentication unit  206  collates the combined image of the fingerprint pattern combined by the data combination unit  204  with a fingerprint template of a fingerprint pattern stored in advance in the storage unit  210 , thereby authenticating the user (a pattern matching method). Further, for example, the authentication unit  206  collates a feature point extracted from the combined image with a feature point of a fingerprint pattern stored in advance in the storage unit  210 , thereby authenticating the user (a feature point method). Further, for example, the authentication unit  206  slices the combined image into a strip shape, spectrally analyzes a pattern for each sliced pattern, and performs collation using a spectral analysis result of a fingerprint pattern stored in advance in the storage unit  210 , thereby performing authentication (a frequency analysis method). 
     —Output Control Unit  208 — 
     The output control unit  208  performs control related to output of information regarding an authentication result acquired from the authentication unit  206 . For example, the output control unit  208  can perform control to cause the display unit  100  described above to display the information regarding the authentication result. Note that the output control unit  208  may properly refer to various programs, parameters, databases, or the like stored in the storage unit  210  described later at the time of performing various types of output control. 
     —Storage Unit  210 — 
     The storage unit  210  is realized by a random access memory (RAM), a storage device, or the like, and stores programs and various data used for processing in the control unit  200 . Specifically, the storage unit  210  stores programs, various data (for example, the above-described fingerprint template, feature point information, and the like), and the like used by the authentication unit  206 . In addition to the above data, the storage unit  210  may properly store various parameters that need to be stored when certain processing is performed, processing progress, and the like. 
     Further, in the present embodiment, the authentication device  10  may include, for example, a voice output device (not illustrated) such as a speaker, may include a lighting device (not illustrated) that notifies the user of predetermined information (authentication result or the like) by flickering or the like, and may have a functional unit such as the touch sensor unit  102  not illustrated in  FIG. 2 . 
     Further, in  FIG. 2 , the authentication device  10  has a configuration in which the fingerprint sensor unit  104  and the like and the control unit  200  are integrated, but the present embodiment is not limited thereto. For example, the authentication device  10  may be configured as an integrated device including the display unit  100  and the fingerprint sensor unit  104 , the control unit  200  may be configured as a separate unit, and they may be connected to each other by wireless communication or the like. 
     &lt;2.3 Detailed Configuration Around Fingerprint Sensor Unit  104 &gt; 
     The functional configuration of the authentication device  10  according to the present embodiment has been described above. Next, an example of a detailed configuration around the fingerprint sensor unit  104  of the authentication device  10  according to the present embodiment will be described with reference to  FIGS. 3 and 4 .  FIGS. 3 and 4  are explanatory diagrams for explaining a configuration example of a part of the authentication device  10  according to the present embodiment. 
     As illustrated in  FIG. 3 , the authentication device  10  according to the present embodiment has the placement surface  90  on which the fingertip  600  of the user is placed. The authentication device  10  has the display unit  100  that is provided below the placement surface  90 , functions as an irradiation unit irradiating the surface of the fingertip  600  placed on the placement surface  90  with light, and displays guidance information for guiding the fingertip  600  of the user to the placement surface  90  for fingerprint authentication. Further, the authentication device  10  has the fingerprint sensor unit  104  that is provided below the placement surface  90  so as to overlap with the display unit  100  and images a fingerprint pattern a plurality of times, and the lens unit  110  that guides light reflected by the surface of the fingertip  600  to the fingerprint sensor unit  104 . Further, the authentication device  10  has the touch sensor unit  102  that is provided so as to surround the lens unit  110  and the fingerprint sensor unit  104  when viewed from above the placement surface  90  and senses a contact state as to whether or not the fingertip  600  of the user is properly in contact with the placement surface  90 . Details of each of these elements will be described below. 
     (Placement Surface  90 ) 
     The placement surface  90  is a surface on which the fingertip  600  of the user is placed, and is preferably a smooth surface with less unevenness in order to avoid giving discomfort to the fingertip  600  of the user, even if the fingertip  600  comes into contact with any position. Further, the placement surface  90  may be formed using a flexible material in order to improve a contact condition with the fingertip  600 . 
     (Display Unit  100 ) 
     As illustrated in  FIG. 4 , the display unit  100  has the plurality of transparent organic EL elements (light emitting elements)  100   a  disposed in a matrix when viewed from above the placement surface  90 . Further, the transparent organic EL elements  100   a  are disposed so as to correspond to the plurality of imaging elements  104   a  of the fingerprint sensor unit  104  disposed in a matrix when viewed from above the placement surface  90  (specifically, so as to overlap with each other). More specifically, the display unit  100  has a plurality of light emitting element arrays (not illustrated) each including the plurality of transparent organic EL elements  100   a  arranged along a horizontal direction or a vertical direction (predetermined direction) in  FIG. 4  on the placement surface  90 . Further, the display unit  100  has a plurality of light emitting element arrays arranged along the horizontal direction or the vertical direction in  FIG. 4  on the placement surface  90 . More specifically, in a case where the light emitting element array includes the plurality of transparent organic EL elements  100   a  arranged along the horizontal direction, the plurality of light emitting element arrays are arranged along the vertical direction. Furthermore, in a case where the light emitting element array includes the plurality of transparent organic EL elements  100   a  arranged along the vertical direction, the plurality of light emitting element arrays are arranged along the horizontal direction. For example, the transparent organic EL element  100   a  includes a transparent organic EL element or the like having a transparent upper electrode and a transparent lower electrode that transmit light, and can transmit light at the time of non-light emission. 
     For example, in the present embodiment, the control unit  200  can cause the plurality of transparent organic EL elements  100   a  to emit light, and can display guidance information for guiding the fingertip  600  of the user to the placement surface  90  for fingerprint authentication. Further, in the present embodiment, the control unit  200  can perform control such that a plurality of transparent organic EL elements  100   a  different for each imaging emit light, and the plurality of remaining transparent organic EL elements  100   a  not turned on transmit light. At this time, the plurality of imaging elements  104   a  of the fingerprint sensor unit  104  corresponding to the plurality of transparent organic EL elements  100   a  not turned on can image a part of the fingerprint pattern of the fingertip  600  with the light transmitted through the plurality of remaining transparent organic EL elements  100   a  not turned on. Note that, in the present embodiment, in each imaging, the plurality of transparent organic EL elements  100   a  preferably emit light in an irradiation pattern capable of uniformly irradiating the entire placement surface  90  on which the fingertip  600  has been placed with light. 
     (Touch Sensor Unit  102 ) 
     The touch sensor unit  102  can sense, for example, a contact state as to whether or not the fingertip  600  of the user is properly in contact with the placement surface  90 . For example, the touch sensor unit  102  can be a pressure sensor or the like that detects a pressure from the fingertip  600 . 
     (Fingerprint Sensor Unit  104 ) 
     As illustrated in  FIG. 4 , the fingerprint sensor unit  104  has the plurality of imaging elements  104   a  disposed in a matrix form when viewed from above the placement surface  90  so as to correspond to the transparent organic EL elements  100   a  included in the display unit  100 . The imaging element  104   a  includes, for example, a photodiode, a charge coupled device (CCD) element, a complementary metal oxide semiconductor (CMOS) element, or the like. In the present embodiment, the control unit  200  drives the imaging elements  104   a  corresponding to the plurality of transparent organic EL elements  100   a  that are not turned on. At this time, since the light transmitted through the plurality of transparent organic EL elements  100   a  not turned on is condensed on the driven imaging elements  104   a , the fingerprint sensor unit  104  can image a part of the fingerprint pattern of the fingertip  600 . 
     (Lens Unit  110 ) 
     Between the display unit  100  and the fingerprint sensor unit  104 , the lens unit  110  including a micro lens array (MLA) having a plurality of microlenses (not illustrated) disposed in a matrix when viewed from above the placement surface  90  is provided. Each microlens can guide light incident on the microlens to each imaging element  104   a . Therefore, the light reflected by the surface of the fingertip  600  placed on the placement surface  90  is condensed on each imaging element  104   a  by the microlens to form an image. 
     As described above, in the present embodiment, by using the display unit  100  including the transparent organic EL element  100   a  having both the function of displaying (emitting light) and the function of transmitting light, it is possible to omit provision of the irradiation unit  162  included in the authentication device  10   a  of the comparative example. Further, in the present embodiment, since the display unit  100  and the fingerprint sensor unit  104  can be provided in a stacked manner, the authentication device  10  can be downsized. 
     &lt;2.4 Authentication Method&gt; 
     The detailed configuration of the authentication device  10  according to the present embodiment has been described above. Next, an outline of an authentication method according to the present embodiment will be described with reference to  FIGS. 5 and 6 .  FIG. 5  is a diagram illustrating a flowchart of the authentication method according to the present embodiment. Further,  FIG. 6  is an explanatory diagram for explaining an operation example of the authentication device  10  according to the present embodiment. 
     As illustrated in  FIG. 5 , the authentication method according to the present embodiment includes steps S 101  to S 107 . Each step of the authentication method according to the present embodiment will be described below. First, before performing authentication, the authentication device  10  displays guidance display (not illustrated) on the display unit  100  toward the user, thereby guiding the fingertip  600  of the user to the placement surface  90 . 
     —Step S 101 — 
     The authentication device  10  turns on the plurality of transparent organic EL elements  100   a  at predetermined positions among the plurality of transparent organic EL elements  100   a , and causes the plurality of remaining transparent organic EL elements  100   a  not turned on to transmit light. Then, the authentication device  10  drives the plurality of imaging elements  104   a  overlapping with the plurality of transparent organic EL elements  100   a  that are not turned on when viewed from above the placement surface  90 , thereby imaging a part of the fingerprint pattern. 
     Here, for example, a case where the display unit  100  has a plurality of light emitting element arrays each including the plurality of transparent organic EL elements  100   a  arranged along the horizontal direction in  FIG. 4  on the placement surface  90 , and the plurality of light emitting element arrays are arranged along the vertical direction in  FIG. 4  (direction perpendicular to the horizontal direction) on the placement surface  90  will be described. In such a case, in step S 101 , the authentication device  10  controls the plurality of transparent organic EL elements  100   a  so as to form an irradiation pattern in which each light emitting element array is alternately turned on and turned off (alternately turned on and turned off along the vertical direction). Then, in a case where the irradiation pattern is used, since the plurality of imaging elements  104   a  overlapping with the plurality of transparent organic EL elements  100   a  that are not turned on image the fingerprint pattern, in step S 101 , an imaged image  500   a  illustrated in the upper left part of  FIG. 6  can be acquired. That is, in step S 101 , the authentication device  10  can obtain the imaged image  500   a  including an image of one row at an interval of one row along the vertical direction. 
     —Step S 103 — 
     Next, the authentication device  10  turns on the plurality of transparent organic EL elements  100   a  not turned on in step S 101  described above, and causes the plurality of remaining transparent organic EL elements  100   a  not turned on to transmit light. Then, the authentication device  10  drives the plurality of imaging elements  104   a  overlapping with the plurality of transparent organic EL elements  100   a  that are not turned on when viewed from above the placement surface  90 , thereby imaging a part of the fingerprint pattern. 
     For example, in step S 103 , the authentication device  10  controls the plurality of transparent organic EL elements  100   a  to form an irradiation pattern in which each light emitting element array is alternately turned on and turned off to turn on the light emitting element arrays not turned on in step S 101  described above. When the irradiation pattern is used, in step S 103 , an imaged image  500   b  illustrated in the upper right part of  FIG. 6  can be acquired. That is, in step S 103 , the authentication device  10  can obtain the imaged image  500   b  including an image of one row at an interval of one row along the vertical direction. 
     In steps S 101  and S 103  described above, the plurality of transparent organic EL elements  100   a  provided in a matrix preferably emit light in an irradiation pattern capable of uniformly irradiating the entire placement surface  90  with light. Meanwhile, in the comparative example, as described above, since the region on the surface of the fingertip  600  close to the irradiation unit  162  is strongly irradiated with light, the image of the fingerprint pattern in the region has high brightness. On the other hand, in the region on the surface of the fingertip  600  far from the irradiation unit  162 , light is weakly applied according to a distance from the irradiation unit  162 , so that the image of the fingerprint pattern in the region has low brightness. Therefore, in the comparative example, the brightness varies in the image of the fingerprint pattern. On the other hand, in the present embodiment, although the fingerprint pattern is imaged twice, in each imaging, the plurality of transparent organic EL elements  100   a  provided in a matrix can uniformly irradiate the entire placement surface  90  with light from below the placement surface  90 . Therefore, variation in brightness hardly occurs in the image of the fingerprint pattern acquired in each imaging, and a high-quality image of a part of the fingerprint pattern image for authentication can be acquired. 
     —Step S 105 — 
     The authentication device  10  acquires the imaged image of the fingerprint pattern imaged in steps S 101  and S 103  described above. Further, the authentication device  10  combines the two imaged images in a state where respective ends of the acquired imaged images and respective pixels overlap with each other with accuracy, and acquires one combined image. For example, in the present embodiment, the authentication device  10  can combine the imaged images  500   a  and  500   b  illustrated in the upper part of  FIG. 6  to obtain a combined image  502  illustrated in the lower part of  FIG. 6 . As described above, in each imaging of steps S 101  and S 103 , only an image of a part of the fingerprint pattern can be acquired although the quality is high. Therefore, in the present embodiment, in step S 105 , an image of a fingerprint pattern can be acquired by combining imaged images of a part of the two fingerprint patterns imaged in steps S 101  and S 103 . 
     —Step S 107 — 
     The authentication device  10  authenticates the user on the basis of feature information of the combined image of the fingerprint pattern combined in step S 105  described above. Note that, in the present embodiment, the authentication method is not particularly limited. 
     As described above, in the present embodiment, by using the display unit  100  including the transparent organic EL element  100   a  having both the function of displaying (emitting light) and the function of transmitting light, it is possible to omit provision of the irradiation unit  162  included in the authentication device  10   a  of the comparative example. Further, in the present embodiment, since the display unit  100  and the fingerprint sensor unit  104  can be provided in a stacked manner, the authentication device  10  can be downsized. Further, in the present embodiment, although the fingerprint pattern is imaged twice, in each imaging, the plurality of transparent organic EL elements  100   a  provided in a matrix can uniformly irradiate the entire placement surface  90  with light from below the placement surface  90 . Therefore, variation in brightness hardly occurs in the image of the fingerprint pattern acquired in each imaging, and a high-quality image of a part of the fingerprint pattern image for authentication can be acquired. Note that, in the present embodiment, an image of a fingerprint pattern can be acquired by combining imaged images of a part of the two imaged fingerprint patterns. That is, according to the present embodiment, it is possible to provide the authentication device  10  that can be downsized and can acquire a high-quality imaged image of a fingerprint pattern. 
     Note that, in the above description, the example in which the present embodiment is applied to the authentication device  10  that authenticates the user using the image of the fingerprint pattern has been described, but the present embodiment is not limited thereto. For example, the configuration and the operation according to the present embodiment may be applied to an authentication device and an authentication method that authenticate the user using an image of a vein pattern, or may be applied to an imaging apparatus and an imaging method that image a fingerprint pattern, a vein pattern, or the like. 
     &lt;2.5 Modification&gt; 
     In the present embodiment, the irradiation pattern in each imaging is not particularly limited as long as light is emitted in an irradiation pattern capable of uniformly irradiating the entire placement surface  90  on which the fingertip  600  is placed with light. In other words, in the present embodiment, the irradiation pattern is not limited to the above-described irradiation pattern as long as the distribution of the transparent organic EL elements  100   a  turned on around the imaging element  104   a  that performs imaging is uniform for each imaging element  104   a . Therefore, modifications of the present embodiment will be described with reference to  FIGS. 7 and 8 . 
       FIGS. 7 and 8  are explanatory diagrams for explaining an operation example of an authentication device  10  according to the modification of the present embodiment. 
     In the present modification, for example, a case where the display unit  100  has a plurality of light emitting element arrays each including a plurality of transparent organic EL elements  100   a  arranged along the vertical direction in  FIG. 4  on the placement surface  90 , and the plurality of light emitting element arrays are arranged along the horizontal direction in  FIG. 4  on the placement surface  90  will be described. In such a case, the authentication device  10  may control the plurality of transparent organic EL elements  100   a  so as to form an irradiation pattern in which each light emitting element array is alternately turned on and turned off (alternately turned on and turned off along the horizontal direction). In such a case, an imaged image  500   a  illustrated in the upper left part of  FIG. 7  can be acquired in first imaging, and an imaged image  500   a  illustrated in the upper right part of  FIG. 7  can be acquired in second imaging. Then, the authentication device  10  can combine the imaged images  500   a  and  500   b  illustrated in the upper part of  FIG. 7  to obtain a combined image  502  illustrated in the lower part of  FIG. 7 . 
     Furthermore, for example, in another modification, the authentication device  10  may control the plurality of transparent organic EL elements  100   a  so as to form an irradiation pattern in which the transparent organic EL elements  100   a  are alternately turned on and turned off in a checkered pattern when viewed from above the placement surface  90  in each imaging. In such a case, an imaged image  500   a  illustrated in the upper left part of  FIG. 8  can be acquired in first imaging, and an imaged image  500   a  illustrated in the upper right part of  FIG. 8  can be acquired in second imaging. Then, the authentication device  10  can combine the imaged images  500   a  and  500   b  illustrated in the upper part of  FIG. 8  to obtain a combined image  502  illustrated in the lower part of  FIG. 8 . 
     Further, in the present embodiment, the imaging is not limited to two times as described above, and may be performed a plurality of times such as three times or four times. In this way, since adjustment of the brightness in the imaged image can be finely performed, a higher-quality fingerprint pattern image can be acquired. Therefore, modifications of the present embodiment will be described with reference to  FIGS. 9 to 17 .  FIGS. 9 to 17  are explanatory diagrams for explaining an operation example of an authentication device  10  according to the modification of the present embodiment. 
     In the present modification, for example, a case where the display unit  100  has a plurality of light emitting element arrays each including a plurality of transparent organic EL elements  100   a  arranged along the horizontal direction in  FIG. 4  on the placement surface  90 , and the plurality of light emitting element arrays are arranged along the vertical direction in  FIG. 4  on the placement surface  90  will be described. In such a case, the authentication device  10  may control the plurality of transparent organic EL elements  100   a  so as to form an irradiation pattern in which one light emitting element array and two light emitting element arrays are alternately turned off and turned on. In such a case, an imaged image  500   a  illustrated in the upper left part of  FIG. 9  can be acquired in first imaging, an imaged image  500   b  illustrated in the upper center of  FIG. 9  can be acquired in second imaging, and an imaged image  500   c  illustrated in the upper right part of  FIG. 9  can be acquired in third imaging. Then, the authentication device  10  can combine the imaged images  500   a ,  500   b , and  500   c  illustrated in the upper part of  FIG. 9  to obtain a combined image  502  illustrated in the lower part of  FIG. 9 . 
     Further, in the present modification, a case where the display unit  100  has a plurality of light emitting element arrays each including a plurality of transparent organic EL elements  100   a  arranged along the vertical direction in  FIG. 4  on the placement surface  90 , and the plurality of light emitting element arrays are arranged along the horizontal direction in  FIG. 4  on the placement surface  90  will be described. In such a case, the authentication device  10  may control the plurality of transparent organic EL elements  100   a  so as to form an irradiation pattern in which one light emitting element array and two light emitting element arrays are alternately turned off and turned on. In such a case, an imaged image  500   a  illustrated in the upper left part of  FIG. 10  can be acquired in first imaging, an imaged image  500   b  illustrated in the upper center of  FIG. 10  can be acquired in second imaging, and an imaged image  500   c  illustrated in the upper right part of  FIG. 10  can be acquired in third imaging. Then, the authentication device  10  can combine the imaged images  500   a ,  500   b , and  500   c  to obtain a combined image  502 . 
     Further, a case where the display unit  100  has a plurality of light emitting element arrays each including a plurality of transparent organic EL elements  100   a  arranged along a direction from the upper left end to the lower right end in  FIG. 4  on the placement surface  90 , and the plurality of light emitting element arrays are arranged along a direction from the upper right end to the lower left end in  FIG. 4  on the placement surface  90  will be described. In the present modification, the authentication device  10  may control the plurality of transparent organic EL elements  100   a  so as to form an irradiation pattern in which one light emitting element array and two light emitting element arrays are alternately turned off and turned on. In such a case, an imaged image  500   a  illustrated in the upper left part of  FIG. 11  can be acquired in first imaging, an imaged image  500   b  illustrated in the upper center of  FIG. 11  can be acquired in second imaging, and an imaged image  500   c  illustrated in the upper right part of  FIG. 11  can be acquired in third imaging. Then, the authentication device  10  can combine the imaged images  500   a ,  500   b , and  500   c  to obtain a combined image  502 . 
     Further, a case where the display unit  100  has a plurality of light emitting element arrays each including a plurality of transparent organic EL elements  100   a  arranged along a direction from the upper right end to the lower left end in  FIG. 4  on the placement surface  90 , and the plurality of light emitting element arrays are arranged along a direction from the upper left end to the lower right end in  FIG. 4  on the placement surface  90  will be described. In the present modification, the authentication device  10  may control the plurality of transparent organic EL elements  100   a  so as to form an irradiation pattern in which one light emitting element array and two light emitting element arrays are alternately turned off and turned on. In such a case, an imaged image  500   a  illustrated in the upper left part of  FIG. 12  can be acquired in first imaging, an imaged image  500   b  illustrated in the upper center of  FIG. 12  can be acquired in second imaging, and an imaged image  500   c  illustrated in the upper right part of  FIG. 12  can be acquired in third imaging. Then, in such a case, the authentication device  10  can combine the imaged images  500   a ,  500   b , and  500   c  to obtain a combined image  502 . 
     Further, a case where the display unit  100  has a plurality of light emitting element arrays each including a plurality of transparent organic EL elements  100   a  arranged along the horizontal direction in  FIG. 4  on the placement surface  90 , and the plurality of light emitting element arrays are arranged along the vertical direction in  FIG. 4  on the placement surface  90  will be described. In the present modification, the authentication device  10  may control the plurality of transparent organic EL elements  100   a  so as to form an irradiation pattern in which one light emitting element array and three light emitting element arrays are alternately turned on and turned off. In such a case, the authentication device  10  can acquire an imaged image  500   a  illustrated in the upper left part of  FIG. 13  in first imaging, and can acquire an imaged image  500   b  illustrated in the upper center left part of  FIG. 13  in second imaging. Then, the authentication device  10  can acquire an imaged image  500   c  illustrated in the upper center right part of  FIG. 13  in third imaging, and can acquire an imaged image  500   d  illustrated in the upper right part of  FIG. 13  in fourth imaging. Then, in such a case, the authentication device  10  can combine the imaged images  500   a ,  500   b ,  500   c , and  500   d  illustrated in the upper part of  FIG. 13  to obtain a combined image  502  illustrated in the lower part of  FIG. 13 . 
     Further, a case where the display unit  100  has a plurality of light emitting element arrays each including a plurality of transparent organic EL elements  100   a  arranged along the vertical direction in  FIG. 4  on the placement surface  90 , and the plurality of light emitting element arrays are arranged along the horizontal direction in  FIG. 4  on the placement surface  90  will be described. In the present modification, the authentication device  10  may control the plurality of transparent organic EL elements  100   a  so as to form an irradiation pattern in which one light emitting element array and three light emitting element arrays are alternately turned off and turned on. In such a case, the authentication device  10  can acquire an imaged image  500   a  illustrated in the upper left part of  FIG. 14  in first imaging, and can acquire an imaged image  500   b  illustrated in the upper center left part of  FIG. 14  in second imaging. Then, the authentication device  10  can acquire an imaged image  500   c  illustrated in the upper center right part of  FIG. 14  in third imaging, and can acquire an imaged image  500   d  illustrated in the upper right part of  FIG. 14  in fourth imaging. Then, in such a case, the authentication device  10  can combine the imaged images  500   a ,  500   b ,  500   c , and  500   d  to obtain a combined image  502 . 
     Further, a case where the display unit  100  has a plurality of light emitting element arrays each including a plurality of transparent organic EL elements  100   a  arranged along a direction from the upper left end to the lower right end in  FIG. 4  on the placement surface  90 , and the plurality of light emitting element arrays are arranged along a direction from the upper right end to the lower left end in  FIG. 4  on the placement surface  90  will be described. In the present modification, the authentication device  10  may control the plurality of transparent organic EL elements  100   a  so as to form an irradiation pattern in which one light emitting element array and three light emitting element arrays are alternately turned off and turned on. In such a case, the authentication device  10  can acquire an imaged image  500   a  illustrated in the upper left part of  FIG. 15  in first imaging, and can acquire an imaged image  500   b  illustrated in the upper center left part of  FIG. 15  in second imaging. Then, the authentication device  10  can acquire an imaged image  500   c  illustrated in the upper center right part of  FIG. 15  in third imaging, and can acquire an imaged image  500   d  illustrated in the upper right part of  FIG. 15  in fourth imaging. Then, in such a case, the authentication device  10  can combine the imaged images  500   a ,  500   b ,  500   c , and  500   d  to obtain a combined image  502 . 
     For example, a case where the display unit  100  has a plurality of light emitting element arrays each including a plurality of transparent organic EL elements  100   a  arranged along a direction from the upper right end to the lower left end in  FIG. 4  on the placement surface  90 , and the plurality of light emitting element arrays are arranged along a direction from the upper left end to the lower right end in  FIG. 4  on the placement surface  90  will be described. In the present modification, the authentication device  10  may control the plurality of transparent organic EL elements  100   a  so as to form an irradiation pattern in which one light emitting element array and three light emitting element arrays are alternately turned off and turned on. In such a case, the authentication device  10  can acquire an imaged image  500   a  illustrated in the upper left part of  FIG. 16  in first imaging, and can acquire an imaged image  500   b  illustrated in the upper center left part of  FIG. 16  in second imaging. Then, the authentication device  10  can acquire an imaged image  500   c  illustrated in the upper center right part of  FIG. 16  in third imaging, and can acquire an imaged image  500   d  illustrated in the upper right part of  FIG. 16  in fourth imaging. Then, in such a case, the authentication device  10  can combine the imaged images  500   a ,  500   b ,  500   c , and  500   d  to obtain a combined image  502 . 
     Further, a case where the display unit  100  has a plurality of light emitting element arrays each including a plurality of transparent organic EL elements  100   a  arranged along the vertical direction in  FIG. 4  on the placement surface  90 , and the plurality of light emitting element arrays are arranged along the horizontal direction in  FIG. 4  on the placement surface  90  will be described. In the present modification, the authentication device  10  alternately turns on and turns off each light emitting element array, but performs control to form an irradiation pattern in which each transparent organic EL element  100   a  is alternately turned on and turned off in one light emitting element array to be turned on. In such a case, the authentication device  10  can acquire an imaged image  500   a  illustrated in the upper left part of  FIG. 17  in first imaging, and can acquire an imaged image  500   b  illustrated in the upper center left part of  FIG. 17  in second imaging. Then, the authentication device  10  can acquire an imaged image  500   c  illustrated in the upper center right part of  FIG. 17  in third imaging, and can acquire an imaged image  500   d  illustrated in the upper right part of  FIG. 17  in fourth imaging. Then, in such a case, the authentication device  10  can combine the imaged images  500   a ,  500   b ,  500   c , and  500   d  to obtain a combined image  502 . 
     Further, in the present embodiment, an arbitrary pattern may be used instead of the regular irradiation pattern described above, and there is no particular limitation as long as an arbitrary irradiation pattern can uniformly irradiate the entire placement surface  90  on which the fingertip  600  is placed with light. For example, by using various arbitrary irradiation patterns, it is possible to acquire the imaged images  500   a  to  500   c  of the part of the fingerprint pattern as illustrated in the upper parts of  FIGS. 18 to 21  which are the explanatory diagrams for explaining the operation example of the authentication device  10  according to the modification of the present embodiment. Then, by combining the imaged images  500   a  to  500   c  of the part of the fingerprint pattern, the combined image  502  illustrated in the lower part of each drawing can be acquired. 
     Further, in the embodiment and the modifications described above, the images of the part of the fingerprint pattern acquired in each imaging are different from each other, but the present embodiment is not limited thereto. For example, in a case where a high-quality image of the center region of the fingerprint pattern is required for authentication, in the present embodiment, an image of the center region of the fingerprint pattern may be acquired in each imaging and these images may be combined so as to overlap with each other, thereby acquiring an image in which the center region has been more emphasized. 
     3. Second Embodiment 
     In the embodiment of the present disclosure described above, an entire placement surface  90  on which a fingertip  600  is placed is uniformly irradiated with light by a plurality of transparent organic EL elements  100   a  disposed in a matrix, so that a high-quality image for authentication can be acquired. However, a surface of the fingertip  600  is a curved surface, and the entire surface of the fingertip  600  is not always in uniform contact with the placement surface  90 . Therefore, depending on a contact state of the surface of the fingertip  600 , it is not always possible to obtain an image of a fingerprint pattern having uniform brightness over an entire region. Further, in a case where an arbitrary irradiation pattern is used as in the modification described above, since a distribution of the turned-on transparent organic EL elements  100   a  is slightly different for each place, there is a possibility that the brightness varies in the obtained fingerprint pattern image. Furthermore, even when the placement surface  90  is dirty, the brightness may vary in the obtained fingerprint pattern image. 
     Therefore, in a second embodiment of the present disclosure described below, the quality of an imaged image of a fingerprint pattern obtained in first imaging is confirmed, a portion having insufficient brightness is extracted, and an irradiation pattern to be used in next imaging is selected according to an extraction result. In this way, a higher-quality fingerprint pattern image can be obtained. Details of the second embodiment will be described with reference to  FIG. 22 .  FIG. 22  is an explanatory diagram for explaining an operation example of an authentication device  10  according to the present embodiment. 
     Specifically, in the present embodiment, for example, as illustrated in the left part (Phase  1 ) of  FIG. 22 , in first imaging, an irradiation pattern  510  that uniformly irradiates an entire placement surface  90  on which a fingertip  600  is placed with light by a plurality of transparent organic EL elements  100   a  disposed in a matrix is used. In addition, an authentication device  10  analyzes an imaged image of a fingerprint pattern obtained using the irradiation pattern  510 , and extracts, for example, a high brightness region and a low brightness region. 
     Next, the authentication device  10  dynamically adjusts lighting or brightness of the plurality of transparent organic EL elements  100   a  disposed in a matrix, on the basis of an extraction result. For example, in a case where an image with high brightness in a center region is obtained, the authentication device  10  performs adjustment so as to decrease the brightness of the transparent organic EL element  100   a  in a center region  516  as illustrated in the right part (Phase  2 ) of  FIG. 22 . Further, for example, in a case where an image with low brightness in an end region is obtained, the authentication device  10  performs adjustment to increase the brightness of the transparent organic EL element  100   a  in an end region  514  as illustrated in the right part (Phase  2 ) of  FIG. 22 . Then, by performing next imaging using an irradiation pattern  512 , a higher-quality fingerprint pattern image can be obtained. 
     Note that the present embodiment is not limited to the adjustment of the brightness, and the authentication device  10  may select a combination of the transparent organic EL elements  100   a  to be turned on, that is, an irradiation pattern. According to the present embodiment, with the above configuration, it is possible to suppress an increase in power consumed by a display unit  100  by performing a plurality of imaging while acquiring a fingerprint pattern of a more necessary portion. 
     4. Third Embodiment 
     &lt;4.1 Detailed Configuration Around Fingerprint Sensor Unit  104 &gt; 
     Furthermore, an example of a specific configuration around a fingerprint sensor unit  104  of an authentication device  10  according to the present embodiment will be described with reference to  FIGS. 23 and 24 .  FIGS. 23 and 24  are explanatory diagrams for explaining a configuration example of a part of the authentication device  10  according to the present embodiment. Specifically,  FIG. 23  illustrates a cross section of the authentication device  10  cut along a stacking direction, and  FIG. 24  is an exploded perspective view schematically illustrating the authentication device  10  disassembled for each layer. Note that, in  FIG. 24 , illustration of a glass  302  (see  FIG. 23 ) is omitted. 
     As illustrated in  FIG. 23 , the glass  302  is provided on an outermost surface (uppermost surface in the drawing) of the authentication device  10  according to the present embodiment in order to function as a placement surface  90  on which a fingertip  600  of a user is placed and to protect a display unit  100 . Further, in the authentication device  10 , the display unit  100  in which a plurality of transparent organic EL elements (light emitting elements)  100   a  are arranged is provided below the glass  302 . In addition, the fingerprint sensor unit  104  including a plurality of imaging elements  104   a  arranged on a substrate  300  is provided below the display unit  100 . Furthermore, a lens unit  110  made of an MLA that guides light to each imaging element  104   a  is provided between the display unit  100  and the fingerprint sensor unit  104 . When the authentication device  10  is viewed from above the placement surface  90 , in a configuration around the fingerprint sensor unit  104 , as illustrated in  FIG. 24 , the plurality of imaging elements  104   a  are disposed in a matrix on the substrate  300  provided below. Further, in the authentication device  10 , the lens unit  110  and the display unit  100  are stacked on each imaging element  104   a . That is, in the authentication device  10  illustrated in  FIGS. 23 and 24 , it can be said that the display unit  100  is located on the side of the placement surface  90 . 
     &lt;4.2 Modification&gt; 
     Further, in the present embodiment, the authentication device  10  is not limited to the form in which the display unit  100  is located on the side of the placement surface  90 , and the display unit  100  may be located below the fingerprint sensor unit  104 , or the display unit  100  and the fingerprint sensor unit  104  may be provided on the same surface. Therefore, an authentication device  10  according to a modification of the present embodiment will be described with reference to  FIGS. 25 and 26 .  FIGS. 25 and 26  are explanatory diagrams for explaining a configuration example of a part of the authentication device  10  according to the modification of the present embodiment. Specifically,  FIG. 25  is an exploded perspective view schematically illustrating the authentication device  10  according to the present modification disassembled for each layer, and illustration of the glass  302  is omitted in  FIG. 25 .  FIG. 26  is a perspective view of the substrate  300  of the authentication device  10  according to the present modification. 
     For example, as illustrated in  FIG. 25 , in the authentication device  10  according to the modification, when viewed from above the placement surface  90 , each imaging element  104   a  of the fingerprint sensor unit  104  may be provided on a transparent substrate  300   a  provided above the display unit  100 . That is, in the authentication device  10  illustrated in  FIG. 25 , the fingerprint sensor unit  104  is provided above the display unit (irradiation unit)  100  so as to overlap with the display unit  100 . In the present modification, since the display unit  100  and each imaging element  104   a  of the fingerprint sensor unit  104  can be provided in a stacked manner, the authentication device  10  can be downsized. 
     Further, for example, as illustrated in  FIG. 26 , in the authentication device  10  according to the modification, when viewed from above the placement surface  90 , each transparent organic EL element  100   a  of the display unit  100  and each imaging element  104   a  of the fingerprint sensor unit  104  may be disposed on the substrate  300 . Note that, in  FIG. 26 , illustration of the glass  302  on the outermost surface and the lens unit  110  located below the glass  302  is omitted. In the present modification, since each transparent organic EL element  100   a  of the display unit  100  and each imaging element  104   a  of the fingerprint sensor unit  104  can be provided on the same substrate  300 , the authentication device  10  can be downsized. 
     Note that the authentication device  10  illustrated in  FIGS. 25 and 26  can be operated similarly to the first embodiment described above. Specifically, the authentication device  10  according to the present modification turns on the plurality of transparent organic EL elements  100   a  at the predetermined positions among the plurality of transparent organic EL elements  100   a , and causes the plurality of remaining transparent organic EL elements  100   a  that are not turned on to transmit light. Then, the authentication device  10  can image a part of the fingerprint pattern by driving a plurality of imaging elements  104   a  (located in the vicinity of and overlapping with the plurality of transparent organic EL elements  100   a ) corresponding to the plurality of transparent organic EL elements  100   a  that are not turned on. 
     5. Fourth Embodiment 
     Further, an authentication device  10  according to an embodiment of the present disclosure may acquire an image of a pattern appearing on a fingertip  600  other than a fingerprint pattern by controlling a wavelength of light to be emitted. For example, the authentication device  10  may acquire a vein pattern of the fingertip  600  of the user. Therefore, as a fourth embodiment of the present disclosure, an example of acquiring the vein pattern and the like will be described with reference to  FIG. 27 .  FIG. 27  is an explanatory diagram for explaining an operation example of the authentication device  10  according to the present embodiment. 
     For example, in the present embodiment, as illustrated in  FIG. 27 , the authentication device  10  performs imaging using an irradiation pattern  520  for emitting near infrared light and an irradiation pattern  522  for emitting infrared light as Phase  1 . Next, as illustrated in  FIG. 27 , the authentication device  10  performs imaging using an irradiation pattern  524  for emitting green light and an irradiation pattern  526  for emitting blue light as Phase  2 . That is, in the present embodiment, the authentication device  10  performs control so that a plurality of transparent organic EL elements  100   a  sequentially emit near infrared light, red light, green light, and blue light. 
     Specifically, since the near infrared light or the infrared light is easily absorbed by hemoglobin in blood in the vein, the vein appears as a shadow in an imaged image when the fingertip  600  irradiated with the near infrared light or the infrared light is imaged. Therefore, the authentication device  10  can acquire the shadow as a vein pattern by irradiating the fingertip  600  with the near infrared light or the infrared light. In the present embodiment, personal authentication can also be performed using the vein pattern acquired as described above. Further, for example, since the green light or the blue light has low transparency to body tissue, a fingerprint pattern or a sweat gland pattern of the surface of the fingertip  600  can be acquired when the fingertip  600  irradiated with the green light or the blue light is imaged. Therefore, by irradiating the fingertip  600  with the green light or the blue light, the authentication device  10  can acquire a fingerprint pattern or a sweat gland pattern of the surface of the fingertip  600 , and can perform personal authentication using the pattern. 
     That is, in the present embodiment, by controlling the wavelength of the light with which the fingertip  600  is irradiated, the depth to which the light reaches on the surface of the fingertip  600  can be changed, so that not only the fingerprint pattern but also the vein pattern and the like can be acquired. Therefore, in the present embodiment, since two authentication methods can be used by using two different patterns appearing on the fingertip  600 , personal authentication with higher security can be performed. 
     Further, in the present embodiment, for example, by emitting the near infrared light or the infrared light, a time-series change in the volume of the blood vessel (time-series change in blood flow) can be captured, so that it is also possible to detect a pulse or the like. Therefore, in the present embodiment, since it is also possible to determine whether or not an imaged image is obtained from a living body by detecting a time-series change in the pattern of the blood vessel, it is also possible to detect forgery for breaking the authentication. That is, according to the present embodiment, the authentication device  10  can be provided with a determination unit that determines whether or not the imaged image is obtained from the living body. 
     Note that, in the present embodiment, the light is not limited to the near infrared light, the red light, the green light, and the blue light, and light in other wavelength bands may be used. Further, in the present embodiment, not only information regarding the blood flow but also biometric information such as an alcohol concentration or a blood glucose level in the blood vessel may be acquired by using light in other wavelength bands. In such a case, the authentication device  10  according to the present embodiment can also function as a device for performing personal authentication for ensuring privacy when biometric information is acquired. 
     6. Fifth Embodiment 
     Meanwhile, in the authentication device  10  according to each of the embodiments described above, since focal distances of the lens unit  110 , that is, a plurality of lenses forming a microlens array are the same, it may be difficult to acquire detailed information of unevenness of a ridge of a fingerprint pattern, and it may be difficult to extract a high-dimensional feature amount. Therefore, as a fifth embodiment of the present disclosure, an authentication device  10  using a microlens array including a plurality of lenses having different focal distances will be described with reference to  FIGS. 28 and 29 .  FIG. 28  is an explanatory diagram for explaining a configuration example of a part of the authentication device  10  according to the present embodiment, and  FIG. 29  is an explanatory diagram for explaining an operation example of the authentication device  10  according to the present embodiment. 
     Specifically, as illustrated in  FIG. 28 , in the present embodiment, a lens unit  110  has a microlens array including a plurality of lenses  112  disposed in a matrix. In the microlens, it is assumed that four lenses  112  arranged in a square shape have focal distances different from each other. In other words, lenses  112   a ,  112   b ,  112   c , and  112   d  illustrated in  FIG. 28  have focal distances different from each other. Therefore, these lenses  112   a ,  112   b ,  112   c , and  112   d  can connect images of fingerprint patterns at different depths on the corresponding imaging elements  104   a . Note that, in the present embodiment, the four lenses  112  arranged in a square shape are not limited to having focal distances different from each other, and for example, if at least some of the plurality of lenses  112  have focal distances different from each other, the type of focal distance can be properly selected. 
     In the present embodiment, in a case where the lens  112  and a transparent organic EL element  100   a  of a display unit  100  correspond to each other on a one-to-one basis, the authentication device  10  alternately turns on and turns off each light emitting element array, for example. However, the authentication device  10  performs control so as to form an irradiation pattern in which each transparent organic EL element  100   a  is alternately turned on and turned off in one light emitting element array to be turned on. More specifically, the authentication device  10  performs control to form an irradiation pattern illustrated in  FIG. 29( a )  in first imaging, and performs control to form an irradiation pattern illustrated in  FIG. 29( b )  in second imaging. Then, the authentication device  10  performs control to form an irradiation pattern illustrated in  FIG. 29( c )  in third imaging, and performs control to form an irradiation pattern illustrated in  FIG. 29( d )  in fourth imaging. In such a case, the authentication device  10  can combine imaged images  500  obtained by the four imaging to obtain a combined image  502  of the fingerprint pattern including the detailed information of the unevenness of the ridge (the information of the fingerprint pattern at the different depth). 
     As described above, in the present embodiment, since the detailed information of the unevenness of the ridge can be acquired, it is possible to extract a higher-dimensional feature amount, and as a result, the accuracy of authentication can be further improved. Note that, in the present embodiment, the focal distance of the lens  112  is not limited to being selected according to the unevenness of the surface of the fingertip  600 , and for example, a vein of the fingertip  600 , a capillary blood vessel in the dermis, and the like may be imaged by selecting the focal distance according to the inside of the fingertip  600 . 
     7. Sixth Embodiment 
     In the authentication device  10  according to the fifth embodiment described above, in order to avoid images formed by a plurality of lenses  112  on imaging elements  104   a  from interfering with each other, a distance between the lenses  112  when viewed from above a placement surface  90  may be required to be a predetermined distance or more. In such a case, not only an area of a lens unit  110  is increased, but also areas of a display unit  100  and a fingerprint sensor unit  104  are increased accordingly, so that it may be difficult to reduce a size and a manufacturing cost of the authentication device  10 . Therefore, as a sixth embodiment of the present disclosure, an authentication device  10  provided with a shutter layer  304  will be described with reference to  FIG. 30 .  FIG. 30  is an explanatory diagram for explaining a configuration example of a part of the authentication device  10  according to the present embodiment. 
     Specifically, in the authentication device  10  according to the present embodiment, as illustrated in  FIG. 30 , the shutter layer  304  is provided between the display unit  100  and the lens unit  110 . The shutter layer  304  has a plurality of shutter elements  304   a  made of liquid crystal and disposed in a matrix, and the shutter elements  304   a  are provided so as to correspond to the respective lenses  112 . 
     The shutter element  304   a  includes, for example, a passive reflective liquid crystal, two transparent electrodes sandwiching the reflective liquid crystal from both sides, and two polarizing plates sandwiching the two transparent electrodes (polarization angles of the two polarizing plates are orthogonal to each other, for example). In the present embodiment, transmission and non-transmission of light can be controlled by applying a predetermined voltage between the transparent electrodes to change a structure of liquid crystal molecules and change a polarization direction of the light, so that it is possible to cause the shutter element  304   a  to function as a shutter. Therefore, in the present embodiment, by controlling the shutter element  304   a , control is performed such that light passes only through the lens  112  having a specific focal distance, for example, only the shutter element  304   a  on the lens  112  having the specific focal distance transmits light. As a result, in the present embodiment, it is possible to avoid the images formed by the plurality of lenses  112  on the respective imaging elements  104   a  from interfering with each other, and a clear imaged image with less interference can be obtained. 
     As described above, in the present embodiment, since the images formed by the plurality of lenses  112  on the respective imaging elements  104   a  can be avoided from interfering with each other, the distance between the lenses  112  does not have to be the predetermined distance or more. Therefore, according to the present embodiment, it is possible to avoid an increase in the area of the lens unit  110  and an increase in the areas of the display unit  100  and the fingerprint sensor unit  104 , and as a result, it is possible to reduce the size and the manufacturing cost of the authentication device  10 . Note that, in the present embodiment, the shutter layer  304  is not limited to being provided between the display unit  100  and the lens unit  110 , and for example, the shutter layer  304  may be provided between the lens unit  110  and the fingerprint sensor unit  104 . 
     Furthermore, in the present embodiment, each lens  112  may be replaced with a lens group including a combination of a plurality of concave lenses, convex lenses, and the like, and a light shielding body provided with a pinhole. In this case, since each lens group configures, for example, a Kepler-type optical system and forms an image on one corresponding imaging element  104   a , it is possible to avoid images from interfering with each other. 
     8. Seventh Embodiment 
     In the authentication device  10  according to the sixth embodiment described above, close-up shooting of a fingerprint pattern or the like can be performed. However, since it is difficult to image a subject far away from the authentication device  10 , it is required to provide another imaging apparatus capable of such imaging. More specifically, in a case where the authentication device  10  according to the sixth embodiment is provided in a smartphone or the like, since it is difficult for the authentication device  10  to perform a function of imaging a subject (person or landscape) away from the smartphone, another imaging apparatus may be provided in the smartphone. For this reason, it may be difficult to reduce a size and a manufacturing cost of the smartphone. 
     Therefore, as a seventh embodiment of the present disclosure, an authentication device  10  capable of imaging a distant subject will be described with reference to  FIGS. 31 and 32 .  FIG. 31  is an explanatory diagram for explaining a configuration example of a part of the authentication device  10  according to the present embodiment, in which an upper part is a cross-sectional view of the authentication device  10  and a lower part is a plan view of a lens unit  110  of the authentication device  10 . Further,  FIG. 32  is an explanatory diagram for explaining a configuration example of a part of an authentication device  10  according to a modification of the present embodiment, in which an upper part is a cross-sectional view of the authentication device  10  and a lower part is a plan view of the lens unit  110  of the authentication device  10 . Further,  FIG. 33  is an explanatory diagram for explaining an operation example of the authentication device  10  according to the present embodiment. 
     Specifically, in the present embodiment, as illustrated in the upper part of  FIG. 31 , a shutter layer  304  is provided above the lens unit  110 , similarly to the sixth embodiment described above. The shutter layer  304  has a plurality of shutter elements  304   a  disposed in a matrix, and the shutter elements  304   a  are provided so as to correspond to respective lenses  112 . Further, in the present embodiment, as illustrated in the lower part of  FIG. 31 , the lens unit  110  has a plurality of lenses  112  disposed in a matrix, and these lenses  112  include close-up lenses  112   e  and lenses  112   f  for imaging a distant subject. In the present embodiment, since the close-up lens  112   e  and the lens  112   f  for imaging the distant subject are included, the authentication device  10  can perform a function of imaging not only the fingerprint pattern but also the distant subject. Note that, in the example of  FIG. 31 , since the lens  112   f  is disposed at the corner of the lens unit  110 , it is difficult to perform close-up shooting at the corner of the lens unit  110 , but it is preferable to perform designing so as to cover an image in the case of close-up shooting by the lens  112   e  adjacent to the lens  112   f.    
     As described above, in the present embodiment, since the authentication device  10  can perform the function of imaging not only the fingerprint pattern but also the distant subject, it is possible to reduce the size and the manufacturing cost of the smartphone even in a case where the authentication device  10  is provided in the smartphone or the like. For example, the authentication device  10  can image not only the fingerprint pattern but also a face of a user in order to perform face authentication, or can image a one-dimensional code (for example, a bar code or the like) and a two-dimensional code (for example, a QR code (registered trademark) or the like). 
     Further, as a modification of the present embodiment, a light shielding plate  306  having an opening  308  may be provided instead of the shutter layer  304 . Specifically, as illustrated in the upper part of  FIG. 32 , the light shielding plate  306  having the opening  308  is provided above the lens unit  110 . In the present modification, the opening  308  is provided so that a position thereof corresponds to a position of the close-up lens  112   e  of the lens unit  110  and a position of the lens  112   f  for imaging the distant subject. 
     In the present modification, as illustrated in  FIG. 33 , the light shielding plate  306  is mechanically moved by an actuator formed by micro electro mechanical systems (MEMS) to switch a position where light enters the lens unit  110  via the opening  308 . In the present modification, for example, as illustrated in the upper part of  FIG. 33 , it is possible to cause the light to enter only the lens  112   e  by moving the light shielding plate  306 , and as illustrated in the lower part of  FIG. 33 , it is possible to cause the light to enter only the lens  112   f  by moving the light shielding plate  306 . Therefore, even in the present modification, the authentication device  10  can perform a function of imaging not only the fingerprint pattern but also the distant subject. Note that the present modification is not limited to mechanically moving the light shielding plate  306  so as to select a lens with a different focal point, and for example, the light shielding plate  306  may be mechanically moved so as to select a lens with a different angle of view. Further, in the present modification, the light shielding plate  306  is not limited to being provided above the lens unit  110 , and for example, the light shielding plate  306  may be provided between the lens unit  110  and the fingerprint sensor unit  104 . 
     9. Application 
     The authentication device  10  according to each embodiment of the present disclosure described above can be used to ensure security of personal information such as biometric information and asset information, electronic payment, and the like. Further, the authentication device  10  according to the present embodiment can also be applied to a security device installed at a gate of a facility or a door of an automobile, and a security device installed in an IoT device. Further, the authentication device  10  according to the present embodiment may be applied to a medical device (a device for managing medicines and supplements to be dispensed to each individual, a device for managing surgery to be performed to each individual, and the like) not only for ensuring security but also for ensuring safety. In addition, the authentication device  10  according to each embodiment of the present disclosure can also be an imaging apparatus that simply images a fingerprint pattern or the like. 
     10. Summary 
     As described above, according to each embodiment of the present disclosure, it is possible to provide the authentication device  10  that can be downsized and can acquire a high-quality imaged image such as a fingerprint pattern. 
     11. Hardware Configuration 
       FIG. 34  is an explanatory diagram illustrating an example of a hardware configuration of an information processing apparatus  900  according to the present embodiment. In  FIG. 34 , the information processing apparatus  900  illustrates an example of a hardware configuration of the authentication device  10  described above. 
     The information processing apparatus  900  has, for example, a CPU  950 , a ROM  952 , a RAM  954 , a recording medium  956 , an input/output interface  958 , and an operation input device  960 . The information processing apparatus  900  further has a display device  962 , a communication interface  968 , and a sensor  980 . Further, the information processing apparatus  900  connects the respective components by, for example, a bus  970  as a data transmission path. 
     (CPU  950 ) 
     The CPU  950  includes, for example, one or more processors including an arithmetic circuit such as a CPU, various processing circuits, and the like, and functions as a control unit (not illustrated) that controls the entire information processing apparatus  900 , or the above-described control unit  200 . 
     (ROM  952  and RAM  954 ) 
     The ROM  952  stores programs used by the CPU  950 , control data such as calculation parameters, and the like. The RAM  954  temporarily stores, for example, a program executed by the CPU  950 . The ROM  952  and the RAM  954  function as, for example, the storage unit  210  described above in the information processing apparatus  900 . 
     (Recording Medium  956 ) 
     The recording medium  956  functions as the storage unit  210  described above, and stores, for example, various data such as data related to the authentication method according to the present embodiment and various applications. Here, examples of the recording medium  956  include a magnetic recording medium such as a hard disk, and a nonvolatile memory such as a flash memory. Further, the recording medium  956  may be detachable from the information processing apparatus  900 . 
     (Input/Output Interface  958 , Operation Input Device  960 , and Display Device  962 ) 
     The input/output interface  958  connects, for example, the operation input device  960 , the display device  962 , and the like. Examples of the input/output interface  958  include a universal serial bus (USB) terminal, a digital visual interface (DVI) terminal, a high-definition multimedia interface (HDMI) (registered trademark) terminal, various processing circuits, and the like. 
     The operation input device  960  functions as an operation unit (not illustrated), is provided in the information processing apparatus  900 , for example, and is connected to the input/output interface  958  inside the information processing apparatus  900 . Examples of the operation input device  960  include a keyboard, a button, an arrow key, a rotary selector such as a jog dial, a touch panel, or a combination thereof. 
     The display device  962  functions as an information presentation device including the above-described display unit  100 , is provided on the information processing apparatus  900 , for example, and is connected to the input/output interface  958  inside the information processing apparatus  900 . Examples of the display device  962  include an organic electro-luminescence (EL) display and the like. 
     Note that it goes without saying that the input/output interface  958  can be connected to an external device such as an operation input device (for example, a keyboard, a mouse, or the like) outside the information processing apparatus  900  or an external display device. 
     (Communication Interface  968 ) 
     The communication interface  968  is a communication mechanism included in the information processing apparatus  900 , and functions as a communication unit (not illustrated) for performing wireless or wired communication with an external device such as a server via a network (or directly). Here, examples of the communication interface  968  include a communication antenna and a radio frequency (RF) circuit (wireless communication), an IEEE 802.15.1 port and a transmission/reception circuit (wireless communication), an IEEE 802.11 port and a transmission/reception circuit (wireless communication), a local area network (LAN) terminal and a transmission/reception circuit (wired communication), and the like. 
     (Sensor  980 ) 
     The sensor  980  functions as the fingerprint sensor unit  104  and the touch sensor unit  102  described above, and is, for example, a sensor capable of detecting fingerprint information of the user and detecting contact of the fingertip  600  of the user. 
     Note that the hardware configuration of the information processing apparatus  900  is not limited to the configuration illustrated in  FIG. 34 . For example, the information processing apparatus  900  may not include the communication interface  968  in a case of communicating with an external device or the like via a connected external communication device or in a case of a configuration of performing processing in a stand-alone manner. Further, the communication interface  968  may have a configuration capable of communicating with one or more external devices by a plurality of communication methods. Further, the information processing apparatus  900  can have a configuration that does not include the recording medium  956 , the operation input device  960 , the display device  962 , and the like, for example. 
     Although the information processing apparatus  900  has been described above as the present embodiment, the present embodiment is not limited to such a form. The present embodiment can also be applied to various devices capable of performing processing related to an information processing method according to the present embodiment, for example, a communication device such as a mobile phone. 
     Further, the information processing apparatus  900  according to the present embodiment may be applied to a system including a plurality of devices on the premise of connection to a network (or communication between devices), for example, like cloud computing. That is, the information processing apparatus  900  according to the present embodiment described above can also be realized as an information processing system that performs processing related to the information processing method according to the present embodiment by a plurality of devices, for example. 
     An example of the hardware configuration of the information processing apparatus  900  has been described above. Each of the above-described components may be configured using a general-purpose member, or may be configured by hardware specialized for the function of each component. Such a configuration can be properly changed according to a technical level at the time of implementation. 
     12. Supplement 
     Note that the embodiment of the present disclosure described above can include, for example, a program for causing a computer to function as the information processing apparatus according to the present embodiment, and a non-transitory tangible medium on which the program is recorded. In addition, the program may be distributed via a communication line (including wireless communication) such as the Internet. 
     The preferred embodiments of the present disclosure have been described in detail with reference to the accompanying drawings, but the technical scope of the present disclosure is not limited to such examples. It is obvious that a person with an ordinary skill in a technological field of the present disclosure could conceive of various alterations or corrections within the scope of the technical ideas described in the appended claims, and it should be understood that such alterations or corrections will naturally belong to the technical scope of the present disclosure. 
     Furthermore, the effects described in the present specification are merely illustrative or exemplary and are not restrictive. That is, the technology according to the present disclosure can exhibit other effects obvious to those skilled in the art from the description of the present specification in addition to or in place of the above effects. 
     Note that the following configurations also belong to the technical scope of the present disclosure. 
     (1) An imaging apparatus comprising: 
     an irradiation unit that irradiates a subject with light; 
     an imaging unit that images the subject a plurality of times; 
     a control unit that controls the imaging unit and the irradiation unit; and 
     a combination unit that combines a plurality of imaged images obtained by the imaging unit, wherein 
     the imaging unit has a plurality of imaging elements disposed in a matrix when viewed from the side of the subject, 
     the irradiation unit has a plurality of light emitting elements provided so as to correspond to the plurality of imaging elements, and 
     the control unit 
     controls the irradiation unit so as to turn on the plurality of light emitting elements different for each imaging among the plurality of light emitting elements, and 
     controls the imaging unit so as to drive the plurality of imaging elements corresponding to the plurality of light emitting elements that are not turned on. 
     (2) The imaging apparatus according to (1), further comprising: 
     a placement surface on which a part of a body of a user is placed, wherein 
     the irradiation unit is provided below the placement surface and irradiates the part of the body placed on the placement surface with light, and 
     the imaging unit is provided below the placement surface and images a pattern appearing on the part of the body placed on the placement surface a plurality of times. 
     (3) The imaging apparatus according to (2), wherein 
     the plurality of light emitting elements are disposed in a matrix when viewed from above the placement surface. 
     (4) The imaging apparatus according to (3), wherein 
     the imaging unit is provided below the irradiation unit so as to overlap with the irradiation unit, and 
     the control unit 
     controls the irradiation unit so as to transmit light with respect to the plurality of light emitting elements that are not turned on, and 
     controls the imaging unit so as to drive the plurality of imaging elements overlapping with the plurality of light emitting elements that are not turned on when viewed from above the placement surface. 
     (5) The imaging apparatus according to (4), further comprising: 
     a microlens array unit that is provided between the irradiation unit and the imaging unit and has a plurality of microlenses disposed in a matrix when viewed from above the placement surface. 
     (6) The imaging apparatus according to (5), wherein at least some of the plurality of microlenses have focal distances different from each other.
 
(7) The imaging apparatus according to (5) or (6), further including:
 
     a shutter layer that is provided between the irradiation unit and the microlens array unit or between the microlens array unit and the imaging unit. 
     (8) The imaging apparatus according to (5) or (6), further including: 
     a light shielding plate that is provided between the irradiation unit and the microlens array unit or between the microlens array unit and the imaging unit and has a plurality of openings; and 
     an actuator that moves the light shielding plate. 
     (9) The imaging apparatus according to any one of (2) to (8), wherein 
     the irradiation unit has a plurality of light emitting element arrays each including the plurality of light emitting elements arranged along a predetermined direction when viewed from above the placement surface, 
     the plurality of light emitting element arrays are arranged along a direction perpendicular to the predetermined direction, and 
     the control unit controls the irradiation unit such that the light emitting element arrays are alternately turned on and turned off for each predetermined number of the light emitting element arrays in each imaging. 
     (10) The imaging apparatus according to any one of (2) to (8), wherein 
     the control unit controls the irradiation unit such that the light emitting elements are alternately turned on and turned off in a checkered pattern when viewed from above the placement surface in each imaging. 
     (11) The imaging apparatus according to any one of (2) to (8), wherein 
     the irradiation unit has a plurality of light emitting element arrays each including the plurality of light emitting elements arranged along a predetermined direction when viewed from above the placement surface, and 
     the control unit controls the irradiation unit such that the plurality of light emitting elements in the light emitting element array are alternately turned on and turned off for every predetermined number when viewed from above the placement surface in each imaging. 
     (12) The imaging apparatus according to any one of (1) to (8), wherein 
     the control unit selects the plurality of light emitting elements turned on in next imaging, on the basis of the imaged image obtained in previous imaging. 
     (13) The imaging apparatus according to any one of (1) to (8), wherein 
     the control unit adjusts brightness of the plurality of light emitting elements turned on in next imaging, on the basis of the imaged image obtained in previous imaging. 
     (14) The imaging apparatus according to (1), wherein 
     the imaging unit is provided above the irradiation unit so as to overlap with the irradiation unit. 
     (15) The imaging apparatus according to (2), further comprising: 
     a substrate that is provided below the placement surface so as to overlap with the placement surface, wherein 
     the plurality of light emitting elements and the plurality of imaging elements are disposed on the substrate. 
     (16) The imaging apparatus according to any one of (2) to (8), wherein 
     the irradiation unit functions as a display unit that displays guidance information for guiding the user to place a part of the body of the user on the placement surface under the control of the control unit. 
     (17) The imaging apparatus according to any one of (1) to (16), further comprising: an authentication unit that authenticates the user on the basis of a combined image obtained by the combination unit.
 
(18) The imaging apparatus according to (17), wherein the authentication unit authenticates the user on the basis of feature information of a fingerprint appearing on a fingertip of the user.
 
(19) The imaging apparatus according to any one of (2) to (8), wherein the control unit controls the plurality of light emitting elements so as to sequentially emit near infrared light, red light, green light, and blue light.
 
(20) The imaging apparatus according to (19), further comprising: a determination unit that determines whether or not the imaged image has been obtained from a living body, on the basis of the imaged image.
 
(21) The imaging apparatus according to (20), wherein the determination unit determines whether or not the imaged image has been obtained from a living body, on the basis of a time-series change in blood flow appearing on a fingertip of the user.
 
(22) The imaging apparatus according to any one of (2) to (8), wherein the imaging apparatus is included in a wearable terminal worn on the body of the user or a mobile terminal used by the user.
 
(23) An imaging method using an imaging apparatus, the imaging apparatus including
 
     an irradiation unit that irradiates a subject with light, 
     an imaging unit that images the subject a plurality of times, 
     a control unit that controls the imaging unit and the irradiation unit, and 
     a combination unit that combines a plurality of imaged images obtained by the imaging unit, 
     the imaging unit having a plurality of imaging elements disposed in a matrix when viewed from the side of the subject, 
     the irradiation unit having a plurality of light emitting elements provided so as to correspond to the plurality of imaging elements, 
     the imaging method comprising: 
     turning on the plurality of light emitting elements different for each imaging among the plurality of light emitting elements; and 
     driving the plurality of imaging elements corresponding to the plurality of light emitting elements that are not turned on. 
     (24) A program for causing a computer to realize control of an imaging apparatus, the imaging apparatus including 
     an irradiation unit that irradiates a subject with light, 
     an imaging unit that images the subject a plurality of times, 
     a control unit that controls the imaging unit and the irradiation unit, and 
     a combination unit that combines a plurality of imaged images obtained by the imaging unit, 
     the imaging unit having a plurality of imaging elements disposed in a matrix when viewed from the side of the subject, 
     the irradiation unit having a plurality of light emitting elements provided so as to correspond to the plurality of imaging elements, wherein 
     the program causes the computer to realize: 
     a function of turning on the plurality of light emitting elements different for each imaging among the plurality of light emitting elements; and 
     a function of driving the plurality of imaging elements corresponding to the plurality of light emitting elements that are not turned on. 
     REFERENCE SIGNS LIST 
     
         
         
           
               10 ,  10   a  AUTHENTICATION DEVICE 
               90  PLACEMENT SURFACE 
               100  DISPLAY UNIT 
               100   a  TRANSPARENT ORGANIC EL ELEMENT 
               102  TOUCH SENSOR UNIT 
               104  FINGERPRINT SENSOR UNIT 
               104   a  IMAGING ELEMENT 
               110  LENS UNIT 
               112 ,  112   a ,  112   b ,  112   c ,  112   d ,  112   e ,  112   f  LENS 
               150  BAND PORTION 
               160  LIGHT GUIDE PLATE 
               162  IRRADIATION UNIT 
               200  CONTROL UNIT 
               202  IMAGING CONTROL UNIT 
               204  DATA COMBINATION UNIT 
               206  AUTHENTICATION UNIT 
               208  OUTPUT CONTROL UNIT 
               210  STORAGE UNIT 
               300 ,  300   a  SUBSTRATE 
               302  GLASS 
               304  SHUTTER LAYER 
               304   a  SHUTTER ELEMENT 
               306  LIGHT SHIELDING PLATE 
               308  OPENING 
               500   a ,  500   b ,  500   c ,  500   d  IMAGED IMAGE 
               502  COMBINED IMAGE 
               510 ,  512 ,  520 ,  522 ,  524 ,  526  IRRADIATION PATTERN 
               514  END REGION 
               516  CENTER REGION 
               600  FINGERTIP 
               900  INFORMATION PROCESSING APPARATUS 
               950  CPU 
               952  ROM 
               954  RAM 
               956  RECORDING MEDIUM 
               958  INPUT/OUTPUT INTERFACE 
               960  OPERATION INPUT DEVICE 
               962  DISPLAY DEVICE 
               968  COMMUNICATION INTERFACE 
               970  BUS 
               980  SENSOR