Abstract:
A control unit, method and computer program product cooperate to provide a controllable depth of display of at least a part of a graphical user interface. Moreover, the control unit includes a control circuit that controls a depth display of an icon, which may be a user-selectable icon, as part of the graphical user interface. The control circuit changes the depth of display of the icon when an object is detected as approaching the display. In this way, a user is provided with visual feedback when the user is interacting with the graphical user interface.

Description:
TECHNICAL FIELD 
       [0001]    The present disclosure relates to an image processing apparatus, and method, and computer program product, and more particularly, to image processing apparatus and method, and a computer program product, which can allow a function allocated to an icon or the like to be selected and executed without touching a display screen. 
       BACKGROUND ART 
       [0002]    The expansion of a GUI (Graphical User Interface) function has been attempted from the related art. 
         [0003]    For example, as a GUI that adopts an icon, a GUI that is displayed on a touchscreen which is collectively constructed by a display panel such as a liquid crystal panel that displays an icon or the like, and a touch panel that detects a touching by a user&#39;s finger. 
         [0004]    In the GUI using the touchscreen, when the icon displayed on the touchscreen is touched, a function that is allocated to the icon is executed. 
         [0005]    In addition, a technology in which the approach of a finger to a display screen is detected, and the icon is enlarged and displayed is also suggested (for example, refer to PTL1 and PTL2). 
       CITATION LIST 
     Patent Literature 
       [0006]    PTL 1: JP-A-2006-236143 
         [0007]    PTL 2: JP-A-2005-51876 
       SUMMARY OF INVENTION 
     Technical Problem 
       [0008]    However, in PTL1 and PTL2, to select and execute a function allocated to an icon, it is necessary to touch the display screen on which the icon is displayed. 
         [0009]    As described above, when the display screen such as a liquid crystal panel is touched by a finger, a contaminant such as sebum may be attached thereto. In addition, when the display screen is strongly pressed plural times, the liquid crystal panel or the like may be damaged. 
         [0010]    On the other hand, in a case where the function allocated to the icon is allowed to be executed without touching the display screen, for example, there is a problem in that it is difficult to return feedback to a user, through which the user clearly comes to feel the selection of the icon, or the like. 
         [0011]    Under the circumstance, it is desirable to allow a function allocated to an icon or the like to be selected and executed without touching a display screen. 
       Solution to Problem 
       [0012]    According to one embodiment, a control unit includes 
         [0013]    a control circuit that controls a depth display of a part of a graphical user interface displayed on a display, the control circuit changes the depth of display of the part when an object is detected as approaching the display. 
         [0014]    According to an aspect of the embodiment, 
         [0015]    the control unit changes the depth of display by lessening the depth of display. 
         [0016]    According to another aspect of the embodiment, the part is an icon displayed on the display. 
         [0017]    According to another aspect of the embodiment, 
         [0018]    the icon is a user-selectable icon and the control circuit changes the depth of display in response to the object being detected as being within a predetermined distance from the icon. 
         [0019]    According to another aspect of the embodiment, 
         [0020]    the control circuit changes the icon from a first state to a second state when the object is detected as being within a predetermined distance of the display, the second state causing the icon to be perceived visually at a different distance than for the first state. 
         [0021]    According to another aspect of the embodiment, the unit further includes 
         [0022]    a sensor that detects when the object is a predetermined distance from the display. 
         [0023]    According to another aspect of the embodiment, 
         [0024]    the sensor is an electrostatic capacitance sensor that is included as an integral part of the display. 
         [0025]    According to another aspect of the embodiment, the unit further includes 
         [0026]    the display, the display being a 3-dimensional display. 
         [0027]    According to another aspect of the embodiment, 
         [0028]    the 3-dimensional display includes a left image and a right image. 
         [0029]    According to another aspect of the embodiment, 
         [0030]    the control circuit changes a parallax of the part so as to create a visually perceptual change in display depth of the part. 
         [0031]    According to another aspect of the embodiment, 
         [0032]    the part of the graphical user interface is an icon, and 
         [0033]    the control circuit 
         [0034]    changes the depth of display of the part when the object is a first distance from the display, and 
         [0035]    executes a function associated with the icon when the object is detect as being within a second distance from the display, the second distance being less than the first distance. 
         [0036]    According to another aspect of the embodiment, 
         [0037]    the control circuit changes a color of the icon when the object is within the second distance of the display. 
         [0038]    According to another aspect of the embodiment, 
         [0039]    the control circuit causes the icon to gradually disappear in response to the object being detected as being within the second distance and triggering an execution of the function. 
         [0040]    According to a method embodiment, the method includes 
         [0041]    displaying a part of a graphical user interface on a display; 
         [0042]    detecting an object approach the display; 
         [0043]    controlling with a control circuit a depth display of the part of a graphical user interface, the controlling includes changing the depth of display of the part. 
         [0044]    According to an aspect of the method, 
         [0045]    the controlling includes changing the depth of display by lessening the depth of display. 
         [0046]    According to an aspect of the method, 
         [0047]    the part is an icon displayed on the display. 
         [0048]    According to an aspect of the method, 
         [0049]    the icon is a user-selectable icon, and 
         [0050]    the controlling changes the depth of display in response to the object being detected as being within a predetermined distance from the icon. 
         [0051]    According to an aspect of the method, 
         [0052]    the controlling includes changing the icon from a first state to a second state when the object is detected as being within a predetermined distance of the display, the second state causing the icon to be perceived visually at a different distance than for the first state. 
         [0053]    According to an aspect of the method, the method further includes 
         [0054]    detecting with a sensor when the object is a predetermined distance from the display. 
         [0055]    According to a non-transitory computer readable storage device embodiment, the storage device has computer readable instructions that when executed by a processing circuit implement a display control method, the method includes 
         [0056]    displaying a part of a graphical user interface on a display; 
         [0057]    detecting an object approach the display; 
         [0058]    controlling with a control circuit a depth display of the part of a graphical user interface, the controlling includes changing the depth of display of the part. 
       Advantageous Effects of Invention 
       [0059]    According to the embodiments of the present disclosure, it is possible to allow a function allocated to an icon or the like to be selected and executed without touching a display screen. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0060]      FIG. 1  is a diagram illustrating a method of generating a 3D image. 
           [0061]      FIG. 2  is a diagram illustrating a configuration example of a display that displays the 3D image. 
           [0062]      FIG. 3  is a diagram illustrating an example in a case where an image is displayed with a parallax barrier turned on. 
           [0063]      FIG. 4  is a diagram illustrating an example in a case where an image is displayed with the parallax barrier turned off. 
           [0064]      FIGS. 5A and 5B  are diagrams illustrating an appearance configuration example of an imaging apparatus as an embodiment of an image processing apparatus to which a technology of the present disclosure is applied. 
           [0065]      FIG. 6  is a block diagram illustrating an internal configuration example of the imaging apparatus in  FIGS. 5A and 5B . 
           [0066]      FIG. 7  is a block diagram illustrating a functional configuration example of software executed by a CPU. 
           [0067]      FIG. 8  is a diagram illustrating an example of an image displayed on a touchscreen. 
           [0068]      FIGS. 9A and 9B  are diagrams illustrating a transition in a display screen of the touchscreen in a case where an icon is selected. 
           [0069]      FIGS. 10A and 10B  are diagrams illustrating the transition in the display screen of the touchscreen in a case where the icon is selected. 
           [0070]      FIGS. 11A and 11B  are diagrams illustrating the transition in the display screen of the touchscreen in a case where the icon is selected. 
           [0071]      FIG. 12  is a diagram illustrating an example of an icon selection and display controlling process. 
           [0072]      FIG. 13  is a diagram illustrating another example of the icon selection and display controlling process. 
           [0073]      FIG. 14  is a block diagram illustrating a configuration example of a personal computer. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0074]    Hereinafter, an embodiment of the present disclosure will be described with reference to the attached drawings. 
         [0075]    In an embodiment described below, a 3D image (an image that is displayed in a three-dimension) is displayed. Therefore, before describing an embodiment of the present disclosure, an outline of a method of generating the 3D image including a left eye image and a right eye image for ease of comprehension of an embodiment of the present disclosure will be provided. 
         [0076]      FIG. 1  shows a diagram illustrating a method of generating the 3D image. 
         [0077]    A first generation method is a method using an imaging apparatus in which two lenses are provided. That is, in the first generation method, a user maintains the imaging apparatus in such a manner that the two lenses are disposed in an approximately horizontal direction, and takes a picture one time. Then, in the two lenses, data of a left eye image is generated by light that transmits through a left side lens and data of a right eye image is generated by light that transmits through a right side lens. 
         [0078]    In addition, the left eye image data and the right eye image data may be generated corresponding to an image generated by CG (Computer Graphics) without using an imaging apparatus or the like. 
         [0079]    Each of the left eye image and the right eye image generated in this way includes a corresponding object at a position spaced in correspondence with the distance between two lenses of the imaging apparatus. Here, the difference (that is, the distance) between an arranged position in a substantially horizontal direction of the corresponding object included in each of the left eye image and the right eye image is referred to as the parallax. The larger the parallax is, the deeper the depth of the object that is displayed three-dimensionally becomes. That is, the degree of unevenness becomes stronger. Therefore, parallax having the above-described characteristics may be used as a parameter that determines the degree of unevenness of the object displayed three-dimensionally. 
         [0080]      FIG. 2  shows a diagram illustrating a configuration example of a display that displays the above-described 3D image. The display shown in the same drawing is a 3D display  30  that displays a 3D image with a system called a parallax barrier system, and allows a user to sense the unevenness of the object displayed three-dimensionally through an observation of the 3D display  30  with the naked eye. 
         [0081]    As shown in  FIG. 2 , the 3D display  30  includes a display layer  31  and a parallax barrier layer  32 . In the display layer  31 , the left eye image and the right eye image are displayed alternately for each unit pixel (one column) in the horizontal direction. In the same drawing, a column of the display layer  31  in which the left eye image is displayed is indicated by “L”, and a column “R” in which the right eye image is displayed, is indicated by “R”. 
         [0082]    The parallax barrier layer  32  is formed of a lattice-type barrier having the same periodic column as that of the image on the display layer  31 , and the width of an opening portion of the barrier is set to have the same width as that of one image column of the display layer  31 . When a user views the image displayed on the display layer  31  from a position spaced with a predetermined distance through the parallax barrier layer  32 , “L” and “R” images are separately presented to the left and right eyes of the user and therefore parallax occurs. 
         [0083]    For example, as shown in  FIG. 3 , when a user  40  views an image displayed on the display layer  31  from a position spaced with a predetermined distance through the parallax barrier layer  32 , an image composed of columns of a left eye image is presented to a left eye of the user  40 , and an image composed of columns of a right eye image is presented to a right eye of the user  40 . In an example of the same drawing, an image composed of each column of “L 1  (represents a first left eye image)”, . . . , “Ln (represents an n-th left eye image)”, . . . , “LN (represents a N-th left eye image)” is presented to the left eye of the user  40 . In addition, an image composed of each column of “R 1  (represents a first right eye image)”, . . . , “Rn (represents a n-th right eye image)”, . . . , “RN (represents a N-th right eye image)” is presented to the right eye of the user  40 . 
         [0084]    In this way, it is possible to allow the user  40  to sense the unevenness of the object that is displayed three-dimensionally by observing the 3D display  30  with the naked eye. In addition, the image observed through the parallax barrier layer  32  can represent a half of the resolution which the display layer  31  originally has in the horizontal direction. Therefore, the 3D display  30  can display an image with the parallax barrier turned on as shown in  FIG. 3 , and can display the image with the parallax barrier turned off as shown in  FIG. 4 . 
         [0085]      FIG. 4  shows a diagram illustrating an example where the image is displayed with the parallax barrier turned off. In the case of the example in  FIG. 4 , an image displayed in each column of the display layer  31  is presented to the left eye and the right eye of the user  40 , respectively. Therefore, in a case where the image is displayed with the parallax barrier turned off, images “LR 1 ”, “LR 2 ”, . . . , which are presented to both the left and right eyes, are displayed in each column of the display layer  31 , and therefore the image can be displayed with the resolution which the display layer  31  originally has in the horizontal direction. However, in the case of  FIG. 4 , since the image having parallax is not presented to the user, it is difficult to display the image three-dimensionally and only two-dimensional display (2D display) may be performed. 
         [0086]    In this way, the 3D display  30  is configured to 3D-display an image as shown in  FIG. 3 , or 2D-display an image as shown in  FIG. 4 . 
         [0087]      FIGS. 5A and 5B  show diagrams illustrating an appearance configuration example of an imaging apparatus  50  as an embodiment of an image processing apparatus to which a technology of the present disclosure is applied. 
         [0088]      FIG. 5A  shows the front face of the imaging apparatus  50  and  FIG. 5B  shows the rear face thereof, respectively. 
         [0089]    As shown in  FIG. 5A , for example, at the right side of the front face of the imaging apparatus  50  configured as a digital camera, a lens unit  111  is provided. The lens unit  111  includes an optical system such as a condensing lens that condenses light transmitted from a subject, a focus lens that adjusts a focus, and an aperture, and the others (all not shown). The lens unit  111  protrudes from a casing of the imaging apparatus  50  when a power of the imaging apparatus  50  is turned on, and is accommodated in the casing of the imaging apparatus  50  when the power is turned off. In  FIG. 5A , the lens unit  111  is accommodated in the casing of the imaging apparatus  50 . 
         [0090]    At the upper-right side of the lens unit  111  at the front face of the imaging apparatus  50 , an AF (auto focus) auxiliary light transmitting unit  112  is provided. The AF auxiliary light transmitting unit  112  emits light as AF auxiliary light in an optical axis direction of an optical system of the lens unit  111  and thereby illuminates a subject. In this manner, for example, a so-called auto focus function operates, in which even in a dark place, an image of the subject is captured, and the subject is brought into focus based on the image. 
         [0091]    At the upper-middle side of the front face of the imaging apparatus  50 , a strobe  113  is disposed. 
         [0092]    At the right side of the top face of the imaging apparatus  50  when seen from the front face side, a power button  114  that is operated when turning on and off the power is provided, and at the left side thereof when seen from the front face side, a shutter button (release button)  115  that is operated when recording an image that is captured. 
         [0093]    As shown in  FIG. 5B , at the upper-right side of the rear face of the imaging apparatus  50 , a zoom button  116  is provided. 
         [0094]    For example, when a user captures an image of the subject by using the imaging apparatus  50 , when making an instruction of a telephoto (Tele), the user presses a portion (hereinafter, referred to as a T button) marked by “T” in the zoom button  116 . On the other hand, when making an instruction of a wide angle (Wide), the user presses a portion (hereinafter, referred to as a W button) marked by “W” in the zoom button  116 . In addition, the user may make an instruction of the telephoto (Tele) or the wide angle (Wide) in succession by maintaining a pressed state of the T button or W button. 
         [0095]    At a lower side of the zoom button  116 , a mode dial  117  is provided. This mode dial  117  is operated when various modes of the imaging apparatus  50  are selected, or the like. As an operation mode of the imaging apparatus  50 , for example, a photographing mode at which a subject is photographed, or an image display mode at which a photographed image obtained as a result of the photographing of the subject is displayed may be exemplified. In addition, as a mode related to various operations at the photographing mode, a mode where the lighting of the strobe  113  is forcibly turned on or off, a mode where a self-timer is used, a mode where a menu screen is displayed on a liquid crystal panel  120  described later, or the like may be exemplified. 
         [0096]    At a lower side of the mode dial  117 , an operation button  118  is provided. This operation button  118  is used when the user performs an instruction operation allocated in advance. 
         [0097]    For example, the user operates the operation button  118  and thereby moves a cursor on the menu screen, and as a result thereof can select an item present in an arranged position of the cursor. 
         [0098]    A touchscreen  119  includes the liquid crystal panel  120  and an approach panel  121  disposed on the liquid crystal panel  120 , which are integrally formed. The touchscreen  119  displays various images by the liquid crystal panel  120  and receives an operation of the user by the approach panel  121 . 
         [0099]    The liquid crystal panel  120  is configured, for example, as a display having the same configuration as that of the 3D display  30  described above with reference  FIGS. 2 to 4 , and is configured to display an image two-dimensionally or three-dimensionally as necessary. 
         [0100]    The approach panel  121  detects a variance in an electrostatic capacitance through the same method as a touchscreen of an electrostatic capacitance method and thereby detects that the user&#39;s finger or the like approaches thereto. The approach panel  121  detects a variance in an electrostatic capacitance at a predetermined position on a panel and outputs a signal indicating how much the user&#39;s finger or the like approaches at that position. 
         [0101]      FIG. 6  shows a block diagram illustrating an internal configuration of the imaging apparatus  50  in  FIGS. 5A and 5B . 
         [0102]    In addition, in  FIG. 6 , the AF auxiliary light transmitting unit  112  and the strobe  113  in  FIGS. 5A and 5B  are not drawn. 
         [0103]    A CCD (charge coupled device)  131  operates according to a timing signal supplied from a timing generator (TG)  141 . The CCD  131  receives light from a subject, which is incident through the lens unit  111  and performs a photoelectric conversion, and supplies an analog image signal as an electric signal, which corresponds to the amount of light received, to an analog signal processing unit  132 . 
         [0104]    The analog signal processing unit  132  performs an analog signal processing such as an amplification of an analog image signal supplied from the CCD  131 , or the like, according to a control of a CPU (Central Processing Unit)  136 , and supplies the image signal, which is obtained as a result of the analog signal processing, to an A/D (analog/digital) converting unit  133 . 
         [0105]    The A/D converting unit  133  A/D-converts an image signal, which is an analog signal supplied from the analog signal processing unit  132 , according to a control of the CPU  136 , and supplies the image data, which is a digital signal obtained as a result of the conversion, to a digital signal processing unit  134 . 
         [0106]    According to a control of the CPU  136 , the digital signal processing unit  134  performs a digital signal processing such as the removal of noise with respect to the image data supplied from the A/D converting unit  133 , and the image data after the processing to the liquid crystal panel  120 . In this manner, on the liquid crystal panel  120 , an image corresponding to data of the supplied image, that is, a photographed image (hereinafter, referred to as a through-the-lens image) while being photographed is displayed. In addition, the digital signal processing unit  134  compresses and encodes the image data supplied from the A/D converting unit  133  through, for example, a JPEG (joint photographic experts group) method or the like, and supplies the compressed and encoded data obtained as a result thereof to a recording device  135  to be recorded therein. In addition, the digital signal processing unit  134  decompresses and decodes the compressed and encoded data that is recorded in the recording device  135  and supplies the image data obtained as a result thereof to the liquid crystal panel  120 . In this manner, on the liquid crystal panel  120 , an image that corresponds to data of the supplied image, that is, a recorded photographed image is displayed. 
         [0107]    In addition, the digital signal processing unit  134  controls a display of a GUI (for example, a menu screen described later) that is displayed on the liquid crystal panel  120  according to a control of the CPU  136 . 
         [0108]    The recording device  135  includes, for example, a disc such as a DVD (Digital 
         [0109]    Versatile Disc), a semiconductor memory such as a memory card, and other removable recording medium, and is provided to be easily detached from the imaging apparatus  50 . In the recording device  135 , data of the photographed image is recorded. 
         [0110]    The CPU  136  executes a program that is recorded in a program ROM (Read Only Memory)  139 , and controls each unit making up the imaging apparatus  50 , and performs various processes according to a signal supplied from the approach panel  121  or a signal supplied from an operation unit  137 . 
         [0111]    The operation unit  137  is operated by a user and supplies a signal corresponding to the operation to the CPU  136 . In addition, the operation unit  137  includes the power button  114 , the shutter button  115 , the zoom button  116 , the mode dial  117 , the operation button  118 , or the like shown in  FIGS. 5A and 5B . 
         [0112]    An EEPROM (Electrically Erasable Programmable ROM)  138  stores data or the like that is necessary to be maintained even when the power of the imaging apparatus  50  is turned off, in addition to various kinds of information set to the imaging apparatus  50 , according to the control of the CPU  136 . 
         [0113]    The program ROM  139  stores a program, which is executed by the CPU  136 , and data necessary in order for the CPU  136  to execute a program. A RAM (Random Access Memory)  140  temporarily stores a program or data, which is necessary in order for the CPU  136  to perform various processes. 
         [0114]    The timing generator  141  supplies a timing signal to the CCD  131  according to a control of the CPU  136 . A exposure time (shutter speed) in the CCD  131 , or the like is controlled by the timing signal supplied from the timing generator  141  to the CCD  131 . 
         [0115]    A motor driver  142  drives an actuator  143  including a motor according to a control of the CPU  136 . When the actuator  143  is driven, the lens unit  111  protrudes from the casing of the imaging apparatus  50  or is accommodated in the casing of the imaging apparatus  50 . In addition, when the actuator  143  is driven, an adjustment of the aperture making up the lens unit  111 , or a movement of the focus lens making up the lens unit  111  is performed. 
         [0116]    In the imaging apparatus  50  configured as described above, the CCD  131  receives light from a subject, which is incident through the lens unit  111 , and performs a photo-electric conversion, and outputs an analog image signal obtained as a result of the conversion. The analog image signal output from the CCD  131  is made into image data of a digital signal when being passed through the analog signal processing unit  132  and the A/D converting unit  133 , and is supplied to the digital signal processing unit  134 . 
         [0117]    The digital signal processing unit  134  supplies image data supplied from the A/D converting unit  133  to the liquid crystal panel  120 , and as a result thereof, on the liquid crystal panel  120 , a through-the-lens image is displayed. 
         [0118]    When a user operates the shutter button  115  ( FIGS. 5A and 5B ), a signal corresponding to the operation is supplied from the operation unit  137  to the CPU  136 . When the signal corresponding to the operation of the shutter button  115  is supplied from the operation unit  137 , the CPU  136  controls the digital signal processing unit  134  to compress the image data supplied from the A/D converting unit  133  to the digital signal processing unit  134 , and to record the compressed image data obtained as a result of the compression in the recording device  135 . 
         [0119]    In this manner, so-called photographing is performed. 
         [0120]    In addition, the CPU  136  executes a predetermined program and thereby generates image data of a 3D image. 
         [0121]    In the case of generating the 3D image, the CPU  136  sets parallax d. In a case where the parallax d is set to have a large value, a sense of perspective (degree of unevenness of an object that is displayed three-dimensionally) of an object displayed with an image having parallax becomes large. For example, in a case where the parallax d is set to have a large value, at the side of the user who observes a screen, it looks as if the object protrudes forward greatly from the screen (or as if the screen is drawn in deeply). 
         [0122]    On the other hand, when the parallax d is set to have a small value, a sense of perspective (degree of unevenness of an object that is displayed three-dimensionally) of an object displayed with an image having parallax becomes small. For example, in a case where the parallax d is set to have a small value, at the side of the user who observes a screen, it looks as if the object is present to be substantially flush with the screen. 
         [0123]    The CPU  136  acquires image data that becomes an origin of the generation of the 3D image, sets a region to be processed, in which an object to be displayed three-dimensionally is displayed, and sets a reference point P at a predetermined position of the region to be processed in the horizontal direction. The CPU  136  generates respective data of left and right regions that are spaced from the reference point P with the same distance determined in correspondence with the parallax d as left eye image data and right eye image data. 
         [0124]    Images corresponding to the left eye image data and the right eye image data, which are generated in this manner and have the parallax d, are displayed on the touchscreen  119 , and therefore the user is able to observe the 3D image. 
         [0125]      FIG. 7  shows a block diagram illustrating a functional configuration example of software of a program or the like that is executed by the CPU  136 . 
         [0126]    An approach determining unit  181  determines a degree of approach of the user&#39;s finger or the like with respect to the touchscreen  119 , based on an approach detection signal output from an approach panel  121 . For example, when the user&#39;s finger or the like approaches to the touchscreen  119  until a distance from the touchscreen  119  becomes less than a predetermined threshold value, the approach determining unit  181  generates and outputs predetermined data indicating this situation. In addition, when the user&#39;s finger or the like, which approached to the touchscreen  119 , goes away from the touchscreen  119  until a distance from the screen  119  becomes equal to or larger than a predetermined threshold value, the approach determining unit  181  generates and outputs data indicating this situation. In addition, in the data generated by the approach determining unit  181 , information indicating whether the user&#39;s finger or the like approaches to a portion of the touchscreen  119  (the approach panel  121 ) or the like is included. 
         [0127]    A parallax adjusting unit  182  sets parallax of the 3D image generated by a 3D image generating unit  183 . For example, the degree of approach of the user&#39;s finger or the like is specified based on data output from the approach determining unit  181  and the parallax of the 3D image is set based on this degree of approach. For example, in a case where it is specified that the user&#39;s finger approaches to a distance less than a first threshold value, parallax d 1  is set, and in a case where it is specified that the user&#39;s finger approaches to a distance less than a second threshold value smaller than the first threshold value, parallax d 2  larger than the parallax d 1  is set. 
         [0128]    In addition, the parallax adjusting unit  182  acquires data of an image (for example, an image of a menu screen described later) that becomes an origin of the generation of the 3D image, and specifies a region to be processed in which an object to be displayed three-dimensionally is displayed. At this time, for example, an object to be displayed three-dimensionally (for example, an icon that is displayed on a menu screen described below) is specified, based on information that is included in data output from the approach determining unit  181  and indicates whether the user&#39;s finger or the like approaches to which portion of the touchscreen  119 . In addition, the parallax adjusting unit  182  sets a reference point P, for example, at a central position of an object to be displayed three-dimensionally. 
         [0129]    The 3D image generating unit  183  generates respective data of left and right regions that are spaced from the above-described reference point with the same distance determined in correspondence with the parallax as left eye image data and right eye image data. In this manner, data of the 3D image is generated. 
         [0130]    When the degree of approach between the object to be displayed three-dimensionally and the user&#39;s finger or the like is specified based on data output from the approach determining unit  181 , a selection execution instructing unit  184  determines that the object is selected based on this degree of approach, and gives an instruction for the execution of a function corresponding to the object. For example, it is determined that a predetermined icon displayed on a menu screen described below is selected, and an instruction is given for an execution of a function corresponding to the icon. 
         [0131]      FIG. 8  shows an example of an image displayed on the touchscreen  119 .  FIG. 8  is regarded as a menu screen displayed when, for example, a mode in which a menu screen is displayed is selected by the above-described mode dial  117  in the imaging apparatus  50 . 
         [0132]    In this menu screen, various icons are displayed. For example, an icon  201  that is displayed as a “simple mode”, an icon  202  that is displayed as a “smile shutter”, . . . , an icon  208  that is displayed as a “display setting” are displayed. 
         [0133]    A user approaches to an icon displayed on the touchscreen  119  using a finger and may select a desired icon. When the icon is selected, a function corresponding to the icon is executed or a predetermined setting is performed. 
         [0134]    For example, when user approaches an icon  207  using a finger, the icon is selected and a function of “face detection” is executed. Here, “face detection” is a function of automatically detecting a face of human beings in a subject that is photographed as an image corresponding to an image signal output from the CCD  131 , and of performing an auto-focusing to further bring the detected face into focus. 
         [0135]    With reference to  FIGS. 9A to 11B , description will be made with respect to a transition of a display screen of the touchscreen  119  in a case where the icon  207  is selected by a user. 
         [0136]      FIG. 9A  shows a diagram illustrating an example of an image obtained when the touchscreen  119  is observed with the user&#39;s eyes. 
         [0137]    As shown in  FIG. 9A , a user approaches to a portion, on which the icon  207  is displayed, of the touchscreen  119  by using a finger  221 . At this time, it is assumed that the finger  221  does not sufficiently approach to the touchscreen  119 . For example, it is assumed that the distance between the finger  221  and the touchscreen  119  is equal to or larger than a threshold value Th 1 . 
         [0138]      FIG. 9B  shows a diagram that is obtained when the user views the touchscreen  119  from a left side direction of  FIG. 9A , and that illustrates a virtual sense of the distance between the icon  207  of the touchscreen  119  and the finger  221 , which the user perceives as a result of observing the touchscreen  119 . In addition,  FIG. 9B  illustrates a sense of perspective which the user perceives from a 3D image, while actually, the icon  207  is just an image that is displayed on a surface of the touchscreen  119  (that is, a planar article not having thickness and depth). 
         [0139]    As shown in  FIG. 9B , the icon  207  does not protrude from the touchscreen  119 . That is, the distance between the finger  221  and the touchscreen  119  is equal to or larger than a threshold value Th 1 , such that an image having parallax is not generated, and the icon  207  seen from a user appears to be located on a surface of the touchscreen  119 . 
         [0140]      FIG. 10A  illustrates another example of an image obtained when the touchscreen  119  is observed with the user&#39;s eyes. As shown in  FIG. 10A , a user further approaches to a portion, on which the icon  207  is displayed, of the touchscreen  119  by using a finger  221 . At this time, for example, it is assumed that the distance between the finger  221  and the touchscreen  119  is less than the threshold value Th 1  and is equal to or larger than a threshold value Th 2 . 
         [0141]      FIG. 10B  shows a diagram that is obtained when the touchscreen  119  is seen from a left side direction of  FIG. 10A , and that illustrates a virtual sense of the distance between the icon  207  of the touchscreen  119  and the finger  221 , which the user perceives as a result of observing the touchscreen  119 . In addition,  FIG. 10B  illustrates a sense of perspective which the user perceives from a 3D image, while actually, the icon  207  is just an image that is displayed on a surface of the touchscreen  119  (that is, a planar article not having thickness and depth). 
         [0142]    As shown in  FIG. 10B , the icon  207  protrudes from the touchscreen  119 , and becomes close to the finger  221 . That is, the distance between the finger  221  and the touchscreen  119  is less than the threshold value Th 1 , such that an image having parallax is generated, and the icon  207  seen from a user. 
         [0143]      FIG. 11A  illustrates still another example of an image obtained when the touchscreen  119  is observed with the user&#39;s eyes. As shown in  FIG. 11A , a user further approaches to a portion, on which the icon  207  is displayed, of the touchscreen  119  by using a finger  221 . At this time, for example, it is assumed that a distance between the finger  221  and the touchscreen  119  is less than the threshold value Th 2 . 
         [0144]      FIG. 11B  shows a diagram that is obtained when the touchscreen  119  is seen from a left side direction of  FIG. 11A , and that illustrates a virtual sense of the distance between the icon  207  of the touchscreen  119  and the finger  221 , which the user perceives as a result of observing the touchscreen  119 . In addition,  FIG. 11B  illustrates a sense of perspective which the user perceives by a 3D image, while actually, the icon  207  is just an image that is displayed on a surface of the touchscreen  119  (that is, a planar article not having thickness and depth). 
         [0145]    As shown in  FIG. 11B , the icon  207  protrudes from the touchscreen  119 , and comes into contact with the finger  221 . That is, the distance between the finger  221  and the touchscreen  119  is less than the threshold value Th 2 , such that an image having a further large parallax is generated, and the icon  207  seen from a user looks as if it further protrudes from the touchscreen  119 . 
         [0146]    In addition, the icon  207  shown in  FIG. 10A  and  FIG. 11A  may be enlarged and displayed. That is, when seen to the side of the user, the icon  207  may be made to look as if it protrudes from the touchscreen  119  and at the same time as if the icon  207  is enlarged compared to other icons. In this manner, it is possible to allow the user to clearly come to feel the selection of the icon  207 . 
         [0147]    When it reaches the state shown in  FIGS. 11A and 11B , a function allocated to the icon  207  is executed. That is, a function (face detection) of automatically detecting a face of human beings in a subject that is photographed as an image corresponding to an image signal output from the CCD  131 , and of performing an auto-focusing to bring the detected face into focus is performed. 
         [0148]    In addition, when a function allocated to the icon  207  is executed, for example, the color of the icon  207  may be changed. In addition, when a function allocated to the icon  207  is executed, for example, the icon  207  may be animation-displayed to gradually disappear (fade-out). In this manner, the user may clearly come to feel the selection of the icon  207 . In addition, in this manner, it is possible to feed back the selection operation of the icon to the user, such that it is possible to allow the user to clearly come to feel the selection of the icon  207 . 
         [0149]    In addition, when the menu screen is displayed three-dimensionally, or when the function of the icon is executed, a predetermined sound effect or the like may be output. 
         [0150]    Next, an example of an icon selection and display controlling process performed by the imaging apparatus  50  will be described with reference to a flowchart of  FIG. 12 . This process is performed, for example, when the imaging apparatus  50  receives a user&#39;s operation through the touchscreen  119 . 
         [0151]    In step S 21 , the CPU  136  controls the digital signal processing unit  134  and displays the menu screen on the liquid crystal panel  120  (the touchscreen  119 ). 
         [0152]    In this manner, for example, the menu screen described above with reference to  FIG. 8  is displayed. 
         [0153]    In step S 22 , the approach determining unit  181  determines whether or not the approach of the user&#39;s finger  221  is detected, and when it is determined that the finger  221  has not approached yet, the process returns to step S 21 . For example, in the case of the state shown in  FIGS. 9A and 9B , it is determined that the user&#39;s finger  221  has not yet approached. 
         [0154]    In a case where it is determined that the approach of the user&#39;s finger  221  is detected in step S 22 , the process proceeds to step S 23 . For example, in the case of the state shown in  FIGS. 10A and 10B , it is determined that the approach of the user&#39;s finger  221  is detected. For example, in a case where the distance between the finger  221  and the touchscreen  119  is less than a threshold value Th 1 , it is determined that the approach of the user&#39;s finger  221  is detected. 
         [0155]    In step S 23 , the parallax adjusting unit  182  specifies an icon that is to be displayed three-dimensionally. At this time, for example, the icon that is to be displayed three-dimensionally is specified based on information that is included in data output from the approach determining unit  181  and that indicates that the user&#39;s finger  221  approaches which portion of the touchscreen  119 . In addition, for example, a reference point P is set to the central position of the icon that is to be displayed three-dimensionally. 
         [0156]    In step S 24 , the parallax adjusting unit  182  specifies a distance between the touchscreen  119  and the finger  221 . The distance between the touchscreen  119  and the finger  221  is specified based on, for example, a degree of approach, which is obtained based on data output from the approach determining unit  181 . 
         [0157]    In step S 25 , the parallax adjusting unit  182  sets parallax of the 3D image generated by the 3D image generating unit  183 . At this time, for example, parallax corresponding to the distance specified in step S 24  is set. For example, in a case where it is specified that the user&#39;s finger approaches to a distance less than a first threshold value, parallax d 1  is set, and in a case where it is specified that the user&#39;s finger approaches to a distance less than a second threshold value smaller than the first threshold value, parallax d 2  larger than parallax d 1  is set. 
         [0158]    In step S 26 , the 3D image generating unit  183  generates data as left eye image data and right eye image data based on the parallax set in the process in step S 25  and the reference point set according to the process in step S 23 . In this manner, the 3D image data is generated. In addition, based on this 3D image data, the menu screen of the touchscreen  119  is displayed three-dimensionally. 
         [0159]    In step S 27 , the parallax adjusting unit  182  determines whether or not the distance between the touchscreen  119  and the finger  221  varies, and in a case where it is determined that the distance between the touchscreen  119  and the finger  221  does not vary, the process returns to step S 26 . 
         [0160]    In step S 27 , in a case where it is determined that the distance between the touchscreen  119  and the finger  221  varies, the process proceeds to step S 28 . 
         [0161]    In step S 28 , the parallax adjusting unit  182  determines whether or not the distance between the touchscreen  119  and the finger  221  is sufficiently small. For example, in a case where the distance between the touchscreen  119  and the finger  221  is less than a threshold value Th 2 , in step S 28 , it is determined that the distance between the touchscreen  119  and the finger  221  is sufficiently small. 
         [0162]    In step S 28 , in a case where it is determined that the distance between the touchscreen  119  and the finger  221  is not sufficiently small, the process returns to step S 22 . On the other hand, in step S 28 , in a case where the distance between the touchscreen  119  and the finger  221  is sufficiently small, the process proceeds to step S 29 . 
         [0163]    For example, in the case of the state shown in  FIGS. 11A and 11B , in step S 28 , it is determined that the distance between the touchscreen  119  and the finger  221  is sufficiently small. For example, in a case where the distance between the touchscreen  119  and the finger  221  is less than the threshold value Th 2 , it is determined that the distance from the user&#39;s finger  221  is sufficiently small. 
         [0164]    In step S 29 , the parallax adjusting unit  182  sets relatively large parallax as parallax of the 3D image generated by the 3D image generating unit  183 . 
         [0165]    In step S 30 , the 3D image generating unit  183  generates data as left eye image data and right eye image data in correspondence with the parallax set in the process of step S 29 . In this manner, the 3D image data is generated and therefore the menu screen of the touchscreen  119  is displayed three-dimensionally. 
         [0166]    In step S 31 , the selection execution instructing unit  184  determines the selection of the icon specified in the process of step S 23 . 
         [0167]    In step S 32 , the selection execution instructing unit  184  allows a function of the icon whose selection is determined in step S 31  to be executed. At this time, for example, as shown in  FIGS. 11A and 11B , the icon  207  is selected, and a function (face detection) of automatically detecting a face of human beings in a subject that is photographed as an image corresponding to an image signal output from the CCD  131 , and of performing an auto-focusing to bring the detected face into focus is performed. 
         [0168]    In this manner, an icon selection and display controlling process is performed. In this way, for example, as described above with reference to  FIG. 9A  to  FIG. 11B , when the user&#39;s finger  221  approaches to the icon  207 , it looks as if the icon  207  protrudes from the touchscreen  119 . In addition, when the user&#39;s finger  221  further approaches to the icon  207 , it looks as if the icon  207  further protrudes from the touchscreen  119  and comes into contact with the finger  221 . 
         [0169]    Therefore, without touching the screen  119  by the finger  221 , it is possible to allow the user to clearly come to feel the selection of the icon  207  and the fact that the function of the icon is executed. 
         [0170]    In addition, in the above-described example, an example where when the finger approaches, the icon is displayed to look as if it protrudes from the touchscreen, but the icon may be displayed in other ways. For example, the display may be performed in such a manner that an icon, which looks as if it sinks in the depth direction of the touchscreen, looks as if it rises up when the finger approaches to the icon. The point is that the display data may be generated such that when the finger approaches to the icon, the icon looks as if it closes to the finger. 
         [0171]    However, in the example described above with reference to  FIG. 12 , for example, in a case where the distance between the touchscreen  119  and the finger  221  is less than the threshold value Th 1 , the approach is detected, and in a case where the distance is less than the threshold value Th 2 , the selection of the icon is determined. That is, the determination of the distance between the touchscreen  119  and the finger  221  is performed in two steps. 
         [0172]    However, the determination of the distance between the touchscreen  119  and the finger  221  may be performed in three steps or more. In this way, a realistic 3D display may be performed. 
         [0173]    In addition, the determination of the distance between the touchscreen  119  and the finger  221  may be performed using a single threshold value. In this case, the icon selection and display control may be relatively simple. 
         [0174]      FIG. 13  shows a flowchart illustrating another example of the icon selection and display controlling process by the imaging apparatus  50 . This process is a process which becomes simpler than the icon selection and display controlling process of  FIG. 12 . 
         [0175]    In step S 51 , the CPU  136  controls the digital signal processing unit  134  to display the menu screen on the liquid crystal panel  120  (the touchscreen  119 ). 
         [0176]    In step S 52 , the approach determining unit  181  determines whether the approach of the user&#39;s finger  221  is detected, and when it is determined that the finger  221  has not yet approached, the process returns to step S 51 . For example, in the case of the state shown in  FIGS. 9A and 9B , it is determined that the user&#39;s finger  221  has not yet approached. 
         [0177]    In a case where it is determined that the approach of the user&#39;s finger  221  is detected in step S 52 , the process proceeds to step S 53 . For example, in a case where the distance between the touchscreen  119  and the finger  221  is less than the threshold value Th 1 , it is determined that the approach of the user&#39;s finger  221  is detected. 
         [0178]    In step S 53 , the parallax adjusting unit  182  specifies an icon that is to be displayed three-dimensionally. At this time, for example, the icon that is to be displayed three-dimensionally is specified based on information that is included in data output from the approach determining unit  181  and that indicates that the user&#39;s finger  221  approaches which portion of the touchscreen  119 . In addition, for example, a reference point P is set to the central position of the icon that is to be displayed three-dimensionally. 
         [0179]    In step S 54 , the parallax adjusting unit  182  sets parallax of the 3D image generated by the 3D image generating unit  183 . At this time, for example, parallax that is determined in advance is set. 
         [0180]    In step S 55 , the 3D image generating unit  183  generates data as left eye image data and right eye image data based on the parallax set in the process in step S 54  and the reference point set according to the process in step S 53 . In this manner, the 3D image data is generated. In addition, based on this 3D image data, the menu screen of the touchscreen  119  is displayed three-dimensionally. 
         [0181]    In step S 56 , the selection execution instructing unit  184  determines the selection of the icon specified in the process of step S 53 . 
         [0182]    In step S 57 , the selection execution instructing unit  184  allows a function of the icon whose selection is determined in step S 31  to be executed. At this time, for example, as shown in  FIGS. 11A and 11B , the icon  207  is selected, and a function (face detection) of automatically detecting a face of human beings in a subject that is photographed as an image corresponding to an image signal output from the CCD  131 , and of performing an auto-focusing to bring the detected face into focus is performed. 
         [0183]    In this manner, the icon selection and display controlling process may be performed. 
         [0184]    Hereinbefore, an example where the present technology is applied to the imaging apparatus  50  is described, but the present technology may be applied to other electronic apparatuses other than the imaging apparatus. The present technology may be applied an arbitrary apparatus as long as an operation using a touchscreen or the like is performed. 
         [0185]    In addition, hereinbefore, an example where the icon or the like displayed on the touchscreen is operated by using a finger or the like is described, but for example, the present technology may be applied to a case where the icon or the like displayed on the touchscreen is operated by using a stylus pen or the like. 
         [0186]    In addition, hereinbefore, an example where the 3D display is performed when the icon in the menu screen displayed on the touchscreen is selected is described, but the application of the present technology is not limited thereto. The point is that the present technology may be applied as long as a GUI part is displayed on the touchscreen or the like, and this GUI part is operated. 
         [0187]    In addition, hereinbefore, an example where the 3D display is performed by the touchscreen having the 3D display in which the parallax barrier system is adopted is described, but the present disclosure may be applied even in a case where the 3D display is performed using a system other than the parallax barrier system. For example, a touchscreen having a 3D display in which a lenticular system is adopted may be used. 
         [0188]    In addition, a touchscreen having a 3D display that allows a user to observe it wearing special eyeglasses other than the 3D display that allows the user to observe it with the naked eye may be used. 
         [0189]    In addition, the above-described serial processes may be executed by hardware or software. In a case where the above-described series of processes is executed by the software, a program making up the software may be installed, over a network or from a recording medium, on a computer in which dedicated hardware is assembled, or for example, a general purpose personal computer  700  shown in  FIG. 14 , which can execute various functions by installing various programs. 
         [0190]    In  FIG. 14 , a CPU (Central Processing Unit)  701  performs various processes according to a program that is stored in a ROM (Read Only Memory)  702 , or a program that is loaded into a RAM (Random Access Memory)  703  from a storage unit  708 . In the RAM  703 , data necessary for executing various processes by the CPU  701  is appropriately stored. 
         [0191]    The CPU  701 , the ROM  702 , and the RAM  703  are connected to each other through a bus  704 . In addition, an I/O interface  705  is connected to the bus  704 . 
         [0192]    To the I/O interface  705 , an input unit  706  such as a keyboard and a mouse, a display such as an LCD (Liquid Crystal Display), an output unit  707  such as a speaker, a storage unit  708  such as a hard disk, and a communication unit  709  such as a modem and a network interface card including a LAN card or the like are connected. The communication unit  709  performed a communication process over a network including the Internet. 
         [0193]    A drive  710  is connected to the I/O interface  705  as necessary, and a removable medium  711  such as a magnetic disk, an optical disc, a magneto-optical disc, and a semiconductor memory is appropriately mounted, and therefore a computer program read out from these may be installed in the storage unit  708  as necessary. 
         [0194]    In the case of executing the above-described serial processes by software, a program making up the software may be installed over a network such as the Internet, or a recording medium such as the removable medium  711 . 
         [0195]    In addition, separately from a main body of the apparatus shown in  FIG. 14 , this recording medium may be composed of not only the removable medium  711  including a magnetic disk (including a floppy disk (registered trademark)), an optical disc (including CD-ROM (Compact Disc-Read Only Memory), and a DVD (Digital Versatile Disc)), an magneto-optical disc (including MD (Mini-Disc)(registered trade mark)), a semiconductor memory, or the like, which is distributed for transmitting a program to a user and on which the program is recorded, but also the ROM  702 , a hard disk included in the storage unit  708 , or the like, which is distributed to a user in a state of being assembled in advance to the main body of the apparatus and in which the program is recorded. 
         [0196]    It should be noted that the present disclosure can also take the following configurations. 
         [0197]    (1) 
         [0198]    An image processing apparatus, including: 
         [0199]    an approach detecting unit that detects whether or not an object, which operates a GUI part, approaches with respect to a display unit that displays the GUI part; 
         [0200]    a part specifying unit that specifies the GUI part that is operated, in a case where the object approaches; and 
         [0201]    an image data generating unit that generates image data that controls a depth display of the display unit such that the specified GUI part looks to be close to the object. 
         [0202]    (2) 
         [0203]    The image processing apparatus according to [1], 
         [0204]    wherein the image data generating unit generates the image data, which controls the depth display of the display unit, according to a degree to which the object approaches with respect to the display unit. 
         [0205]    (3) 
         [0206]    The image processing apparatus according to [2], 
         [0207]    wherein the degree of approach is compared to a threshold value set in advance, and parallax, which is used for the control of the depth display of the display unit, is set in correspondence with the comparison result. 
         [0208]    (4) 
         [0209]    The image processing apparatus according to [1], 
         [0210]    wherein the image data generating unit generates the image data such that the specified GUI part is enlarged and displayed. 
         [0211]    (5) 
         [0212]    The image processing apparatus according to [1], 
         [0213]    wherein the image data generating unit generates the image data such that a color of the specified GUI part is changed. 
         [0214]    (6) 
         [0215]    The image processing apparatus according to [1], further including: 
         [0216]    a function executing unit that executes a function allocated to the specified GUI part, after the image data is generated by the image data generating unit. 
         [0217]    (7) 
         [0218]    The image processing apparatus according to [1], 
         [0219]    wherein the display includes a 3D display adopting a parallax barrier system. 
         [0220]    (8) 
         [0221]    The image processing apparatus according to [1], 
         [0222]    wherein the approach detecting unit includes a touchscreen. 
         [0223]    (9) 
         [0224]    The image processing apparatus according to [1], 
         [0225]    wherein the image data generating unit generates the image data by generating left eye image data and right eye image data that have a predetermined parallax based on a reference point corresponding to a display position of the GUI part. 
         [0226]    (10) 
         [0227]    A method of displaying an operation screen, including: 
         [0228]    allowing an approach detecting unit to detect whether or not an object, which operates a GUI part, approaches with respect to a display unit that displays the GUI part by an approach detecting unit; 
         [0229]    allowing a part specifying unit to specify the GUI part that is operated in a case where the object approaches, by a part specifying unit; and 
         [0230]    allowing an image data generating unit to generate image data that controls a depth display of the display unit such that the specified GUI part looks to be close to the object by an image data generating unit. 
         [0231]    (11) 
         [0232]    A program that allows a computer to function as an image processing apparatus, 
         [0233]    wherein the image processing apparatus includes: 
         [0234]    an approach detecting unit that detects whether or not an object, which operates a GUI part, approaches with respect to a display unit that displays the GUI part; 
         [0235]    a part specifying unit that specifies the GUI part that is operated in a case where the object approaches; and 
         [0236]    an image data generating unit that generates image data that controls a depth display of the display unit such that the specified GUI part looks to be close to the object. In addition, the above-described series of processes in the present specification includes not only processes performed in time series according to the described sequence, but also processes performed in parallel or separately even though not necessarily performed in time series. 
         [0237]    In addition, an embodiment of the present disclosure is not limited to the above-described embodiments, and various changes may be made without departing from the scope of the present disclosure. 
       REFERENCE SIGNS LIST 
       [0000]    
       
           50 : Imaging apparatus 
           119 : Touchscreen 
           120 : Liquid crystal panel 
           121 : Approach panel 
           134 : Digital signal processing unit 
           136 : CPU 
           137 : Operation unit 
           138 : EEPROM 
           139 : Program ROM 
           140 : RAM 
           181 : Approach determining unit 
           182 : Parallax adjusting unit 
           183 : 3D image generating unit 
           184 : Selection executing unit 
           201  to  208 : Icons