Patent Description:
Generally, iris authentication indicates a technology of recognizing a person using iris information of an eyeball having unique property of each person or means such an authentication system. An iris has unique patterns more than those of a fingerprint and is recognizable accurately in a glass or lens worn state. Since iris authentication is a noncontact type, it has no repulsion advantageously. Specifically, such an iris authentication technology is widely applied to such fields as an access control, a computer security, an e-commerce authentication and the like.

As the iris authentication technology has applied throughout the industry, various iris forging methods have appeared. For instance, authentication is attempted in a manner of outputting an iris image through a high-resolution printer, fabricating an iris image into a lens type, outputting an iris image to a 3D artificial eye, or the like.

In order to prevent such an iris forgery, such a method as a liveness test or the like is applied. Representatively, there are an eye blinking check, a pupil motion check, a reflective object information check by IR illumination, and the like.

For instance, <CIT> is directed to a biometric authentication or security system, which obtains two or more images of a subject, particularly an eye, wherein the images collectively include a plurality of focus distances. A behavioral metric, a spatial metric, or a reflectance metric is determined, in order to determine rejecting or accepting one or more of the images. The behavioral metric may be based on constriction of a pupil in response to a photic stimulus. The resulting sequence of pupil diameters measured in response to the photic stimulus may be analyzed to determine one or more motion parameters for the constriction of the pupil. The motion parameters may include a duration of the constriction motion, the velocity of pupil constriction, and an acceleration of the pupil constriction. A distance between one or more determined motion parameters and one or more expected motion parameters is determined.

Accordingly, embodiments of the present invention are directed to a mobile device and controlling method thereof that substantially obviate one or more problems due to limitations and disadvantages of the related art.

One object of first to fifth embodiments of the present invention is to provide a mobile device and controlling method thereof, by which a presence or non-presence of a forged iris can be determined more efficiently using the property of a pupil responding to various external conditions.

Technical tasks obtainable from the present invention are non-limited by the above-mentioned technical tasks. And, other unmentioned technical tasks can be clearly understood from the following description by those having ordinary skill in the technical field to which the present invention pertains.

Additional advantages, objects, and features of the invention will be set forth in the disclosure herein as well as the accompanying drawings. Such aspects may also be appreciated by those skilled in the art based on the disclosure herein.

These objects are solved by the present invention as defined in the independent claims.

Accordingly, embodiments of the present invention provide various effects and/or features.

First of all, a mobile device and controlling method thereof according to one embodiment of the present invention use a prescribed region of a display as a visible light illumination, thereby providing a more convenient and efficient authentication process.

Secondly, a mobile device and controlling method thereof according to another embodiment of the present invention provide various forgery preventing methods varying according to an external illuminance, thereby providing a more accurate forgery preventing process.

Effects obtainable from the present invention may be non-limited by the above mentioned effects. And, other unmentioned effects can be clearly understood from the following description by those having ordinary skill in the technical field to which the present invention pertains.

Description will now be given in detail according to exemplary embodiments disclosed herein, with reference to the accompanying drawings. For the sake of brief description with reference to the drawings, the same or equivalent components may be provided with the same reference numbers, and description thereof will not be repeated. In general, a suffix such as "module" and "unit" may be used to refer to elements or components. Use of such a suffix herein is merely intended to facilitate description of the specification, and the suffix itself is not intended to give any special meaning or function. In the present disclosure, that which is well-known to one of ordinary skill in the relevant art has generally been omitted for the sake of brevity. The accompanying drawings are used to help easily understand various technical features and it should be understood that the embodiments presented herein are not limited by the accompanying drawings. As such, the present disclosure should be construed to extend to any alterations, equivalents and substitutes in addition to those which are particularly set out in the accompanying drawings.

It will be understood that when an element is referred to as being "connected with" another element, the element can be connected with the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly connected with" another element, there are no intervening elements present.

Mobile terminals presented herein may be implemented using a variety of different types of terminals. Examples of such terminals include cellular phones, smart phones, user equipment, laptop computers, digital broadcast terminals, personal digital assistants (PDAs), portable multimedia players (PMPs), navigators, portable computers (PCs), slate PCs, tablet PCs, ultra books, wearable devices (for example, smart watches, smart glasses, head mounted displays (HMDs)), and the like.

By way of non-limiting example only, further description will be made with reference to particular types of mobile terminals. However, such teachings apply equally to other types of terminals, such as those types noted above. In addition, these teachings may also be applied to stationary terminals such as digital TV, desktop computers, and the like.

Reference is now made to <FIG>, where <FIG> is a block diagram of a mobile terminal in accordance with the present disclosure, and <FIG> and <FIG> are conceptual views of one example of the mobile terminal, viewed from different directions.

The mobile terminal <NUM> is shown having components such as a wireless communication unit <NUM>, an input unit <NUM>, a sensing unit <NUM>, an output unit <NUM>, an interface unit <NUM>, a memory <NUM>, a controller <NUM>, and a power supply unit <NUM>. It is understood that implementing all of the illustrated components is not a requirement, and that greater or fewer components may alternatively be implemented.

Referring now to <FIG>, the mobile terminal <NUM> is shown having wireless communication unit <NUM> configured with several commonly implemented components. For instance, the wireless communication unit <NUM> typically includes one or more components which permit wireless communication between the mobile terminal <NUM> and a wireless communication system or network within which the mobile terminal is located.

The wireless communication unit <NUM> typically includes one or more modules which permit communications such as wireless communications between the mobile terminal <NUM> and a wireless communication system, communications between the mobile terminal <NUM> and another mobile terminal, communications between the mobile terminal <NUM> and an external server.

The sensing unit <NUM> is typically implemented using one or more sensors configured to sense internal information of the mobile terminal, the surrounding environment of the mobile terminal, user information, and the like. For example, in <FIG>, the sensing unit <NUM> is shown having a proximity sensor <NUM> and an illumination sensor <NUM>.

If desired, the sensing unit <NUM> may alternatively or additionally include other types of sensors or devices, such as a touch sensor, an acceleration sensor, a magnetic sensor, a G-sensor, a gyroscope sensor, a motion sensor, an RGB sensor, an infrared (IR) sensor, a finger scan sensor, a ultrasonic sensor, an optical sensor (for example, camera <NUM>), a microphone <NUM>, a battery gauge, an environment sensor (for example, a barometer, a hygrometer, a thermometer, a radiation detection sensor, a thermal sensor, and a gas sensor, among others), and a chemical sensor (for example, an electronic nose, a health care sensor, a biometric sensor, and the like), to name a few. The mobile terminal <NUM> may be configured to utilize information obtained from sensing unit <NUM>, and in particular, information obtained from one or more sensors of the sensing unit <NUM>, and combinations thereof.

The controller <NUM> typically functions to control overall operation of the mobile terminal <NUM>, in addition to the operations associated with the application programs. The controller <NUM> may provide or process information or functions appropriate for a user by processing signals, data, information and the like, which are input or output by the various components depicted in <FIG>, or activating application programs stored in the memory <NUM>. As one example, the controller <NUM> controls some or all of the components illustrated in <FIG> according to the execution of an application program that have been stored in the memory <NUM>.

Referring still to <FIG>, various components depicted in this figure will now be described in more detail.

The broadcast managing entity may be implemented using a server or system which generates and transmits a broadcast signal and/or broadcast associated information, or a server which receives a pre-generated broadcast signal and/or broadcast associated information, and sends such items to the mobile terminal. The broadcast signal may be implemented using any of a TV broadcast signal, a radio broadcast signal, a data broadcast signal, and combinations thereof, among others. The broadcast signal in some cases may further include a data broadcast signal combined with a TV or radio broadcast signal.

The broadcast signal may be encoded according to any of a variety of technical standards or broadcasting methods (for example, International Organization for Standardization (ISO), International Electrotechnical Commission (IEC), Digital Video Broadcast (DVB), Advanced Television Systems Committee (ATSC), and the like) for transmission and reception of digital broadcast signals. The broadcast receiving module <NUM> can receive the digital broadcast signals using a method appropriate for the transmission method utilized.

Examples of broadcast associated information may include information associated with a broadcast channel, a broadcast program, a broadcast event, a broadcast service provider, or the like. The broadcast associated information may also be provided via a mobile communication network, and in this case, received by the mobile communication module <NUM>.

The broadcast associated information may be implemented in various formats. For instance, broadcast associated information may include an Electronic Program Guide (EPG) of Digital Multimedia Broadcasting (DMB), an Electronic Service Guide (ESG) of Digital Video Broadcast-Handheld (DVB-H), and the like. Broadcast signals and/or broadcast associated information received via the broadcast receiving module <NUM> may be stored in a suitable device, such as a memory <NUM>.

The mobile communication module <NUM> can transmit and/or receive wireless signals to and from one or more network entities. Typical examples of a network entity include a base station, an external mobile terminal, a server, and the like. Such network entities form part of a mobile communication network, which is constructed according to technical standards or communication methods for mobile communications (for example, Global System for Mobile Communication (GSM), Code Division Multi Access (CDMA), CDMA2000(Code Division Multi Access <NUM>), EV-DO(Enhanced Voice-Data Optimized or Enhanced Voice-Data Only), Wideband CDMA (WCDMA), High Speed Downlink Packet access (HSDPA), HSUPA(High Speed Uplink Packet Access), Long Term Evolution (LTE) , LTE-A(Long Term Evolution-Advanced), and the like).

In some embodiments, another mobile terminal (which may be configured similarly to mobile terminal <NUM>) may be a wearable device, for example, a smart watch, a smart glass or a head mounted display (HMD), which is able to exchange data with the mobile terminal <NUM> (or otherwise cooperate with the mobile terminal <NUM>). The short-range communication module <NUM> may sense or recognize the wearable device, and permit communication between the wearable device and the mobile terminal <NUM>. In addition, when the sensed wearable device is a device which is authenticated to communicate with the mobile terminal <NUM>, the controller <NUM>, for example, may cause transmission of data processed in the mobile terminal <NUM> to the wearable device via the short-range communication module <NUM>. Hence, a user of the wearable device may use the data processed in the mobile terminal <NUM> on the wearable device. For example, when a call is received in the mobile terminal <NUM>, the user may answer the call using the wearable device. Also, when a message is received in the mobile terminal <NUM>, the user can check the received message using the wearable device.

The input unit <NUM> may be configured to permit various types of input to the mobile terminal <NUM>. Examples of such input include audio, image, video, data, and user input. Image and video input is often obtained using one or more cameras <NUM>. Such cameras <NUM> may process image frames of still pictures or video obtained by image sensors in a video or image capture mode. The processed image frames can be displayed on the display unit <NUM> or stored in memory <NUM>. In some cases, the cameras <NUM> may be arranged in a matrix configuration to permit a plurality of images having various angles or focal points to be input to the mobile terminal <NUM>. As another example, the cameras <NUM> may be located in a stereoscopic arrangement to acquire left and right images for implementing a stereoscopic image.

The sensing unit <NUM> is generally configured to sense one or more of internal information of the mobile terminal, surrounding environment information of the mobile terminal, user information, or the like. The controller <NUM> generally cooperates with the sending unit <NUM> to control operation of the mobile terminal <NUM> or execute data processing, a function or an operation associated with an application program installed in the mobile terminal based on the sensing provided by the sensing unit <NUM>. The sensing unit <NUM> may be implemented using any of a variety of sensors, some of which will now be described in more detail.

The proximity sensor <NUM> may include a sensor to sense presence or absence of an object approaching a surface, or an object located near a surface, by using an electromagnetic field, infrared rays, or the like without a mechanical contact. The proximity sensor <NUM> may be arranged at an inner region of the mobile terminal covered by the touch screen, or near the touch screen.

The proximity sensor <NUM>, for example, may include any of a transmissive type photoelectric sensor, a direct reflective type photoelectric sensor, a mirror reflective type photoelectric sensor, a high-frequency oscillation proximity sensor, a capacitance type proximity sensor, a magnetic type proximity sensor, an infrared rays proximity sensor, and the like. When the touch screen is implemented as a capacitance type, the proximity sensor <NUM> can sense proximity of a pointer relative to the touch screen by changes of an electromagnetic field, which is responsive to an approach of an object with conductivity. In this case, the touch screen (touch sensor) may also be categorized as a proximity sensor.

The term "proximity touch" will often be referred to herein to denote the scenario in which a pointer is positioned to be proximate to the touch screen without contacting the touch screen. The term "contact touch" will often be referred to herein to denote the scenario in which a pointer makes physical contact with the touch screen. For the position corresponding to the proximity touch of the pointer relative to the touch screen, such position will correspond to a position where the pointer is perpendicular to the touch screen. The proximity sensor <NUM> may sense proximity touch, and proximity touch patterns (for example, distance, direction, speed, time, position, moving status, and the like).

In general, controller <NUM> processes data corresponding to proximity touches and proximity touch patterns sensed by the proximity sensor <NUM>, and cause output of visual information on the touch screen. In addition, the controller <NUM> can control the mobile terminal <NUM> to execute different operations or process different data according to whether a touch with respect to a point on the touch screen is either a proximity touch or a contact touch.

A touch sensor can sense a touch applied to the touch screen, such as display unit <NUM>, using any of a variety of touch methods. Examples of such touch methods include a resistive type, a capacitive type, an infrared type, and a magnetic field type, among others.

As one example, the touch sensor may be configured to convert changes of pressure applied to a specific part of the display unit <NUM>, or convert capacitance occurring at a specific part of the display unit <NUM>, into electric input signals. The touch sensor may also be configured to sense not only a touched position and a touched area, but also touch pressure and/or touch capacitance. A touch object is generally used to apply a touch input to the touch sensor. Examples of typical touch objects include a finger, a touch pen, a stylus pen, a pointer, or the like.

When a touch input is sensed by a touch sensor, corresponding signals may be transmitted to a touch controller. The touch controller may process the received signals, and then transmit corresponding data to the controller <NUM>. Accordingly, the controller <NUM> may sense which region of the display unit <NUM> has been touched. Here, the touch controller may be a component separate from the controller <NUM>, the controller <NUM>, and combinations thereof.

In some embodiments, the controller <NUM> may execute the same or different controls according to a type of touch object that touches the touch screen or a touch key provided in addition to the touch screen. Whether to execute the same or different control according to the object which provides a touch input may be decided based on a current operating state of the mobile terminal <NUM> or a currently executed application program, for example.

The touch sensor and the proximity sensor may be implemented individually, or in combination, to sense various types of touches. Such touches includes a short (or tap) touch, a long touch, a multi-touch, a drag touch, a flick touch, a pinch-in touch, a pinch-out touch, a swipe touch, a hovering touch, and the like.

If desired, an ultrasonic sensor may be implemented to recognize position information relating to a touch object using ultrasonic waves. The controller <NUM>, for example, may calculate a position of a wave generation source based on information sensed by an illumination sensor and a plurality of ultrasonic sensors. Since light is much faster than ultrasonic waves, the time for which the light reaches the optical sensor is much shorter than the time for which the ultrasonic wave reaches the ultrasonic sensor. The position of the wave generation source may be calculated using this fact. For instance, the position of the wave generation source may be calculated using the time difference from the time that the ultrasonic wave reaches the sensor based on the light as a reference signal.

The camera <NUM> typically includes at least one a camera sensor (CCD, CMOS etc.), a photo sensor (or image sensors), and a laser sensor.

Implementing the camera <NUM> with a laser sensor may allow detection of a touch of a physical object with respect to a 3D stereoscopic image. The photo sensor may be laminated on, or overlapped with, the display device. The photo sensor may be configured to scan movement of the physical object in proximity to the touch screen. In more detail, the photo sensor may include photo diodes and transistors at rows and columns to scan content received at the photo sensor using an electrical signal which changes according to the quantity of applied light. Namely, the photo sensor may calculate the coordinates of the physical object according to variation of light to thus obtain position information of the physical object.

In some embodiments, the display unit <NUM> may be implemented as a stereoscopic display unit for displaying stereoscopic images. A typical stereoscopic display unit may employ a stereoscopic display scheme such as a stereoscopic scheme (a glass scheme), an auto-stereoscopic scheme (glassless scheme), a projection scheme (holographic scheme), or the like.

In general, a 3D stereoscopic image may include a left image (e.g., a left eye image) and a right image (e.g., a right eye image). According to how left and right images are combined into a 3D stereoscopic image, a 3D stereoscopic imaging method can be divided into a top-down method in which left and right images are located up and down in a frame, an L-to-R (left-to-right or side by side) method in which left and right images are located left and right in a frame, a checker board method in which fragments of left and right images are located in a tile form, an interlaced method in which left and right images are alternately located by columns or rows, and a time sequential (or frame by frame) method in which left and right images are alternately displayed on a time basis.

Also, as for a 3D thumbnail image, a left image thumbnail and a right image thumbnail can be generated from a left image and a right image of an original image frame, respectively, and then combined to generate a single 3D thumbnail image. In general, the term "thumbnail" may be used to refer to a reduced image or a reduced still image. A generated left image thumbnail and right image thumbnail may be displayed with a horizontal distance difference there between by a depth corresponding to the disparity between the left image and the right image on the screen, thereby providing a stereoscopic space sense.

A left image and a right image required for implementing a 3D stereoscopic image may be displayed on the stereoscopic display unit using a stereoscopic processing unit. The stereoscopic processing unit can receive the 3D image and extract the left image and the right image, or can receive the 2D image and change it into a left image and a right image.

When the mobile terminal <NUM> is connected with an external cradle, the interface unit <NUM> can serve as a passage to allow power from the cradle to be supplied to the mobile terminal <NUM> or may serve as a passage to allow various command signals input by the user from the cradle to be transferred to the mobile terminal there through. Various command signals or power input from the cradle may operate as signals for recognizing that the mobile terminal is properly mounted on the cradle.

The memory <NUM> can store programs to support operations of the controller <NUM> and store input/output data (for example, phonebook, messages, still images, videos, etc.). The memory <NUM> may store data related to various patterns of vibrations and audio which are output in response to touch inputs on the touch screen.

The memory <NUM> may include one or more types of storage mediums including a Flash memory, a hard disk, a solid state disk, a silicon disk, a multimedia card micro type, a card-type memory (e.g., SD or DX memory, etc), a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a Read-Only Memory (ROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Programmable Read-Only memory (PROM), a magnetic memory, a magnetic disk, an optical disk, and the like. The mobile terminal <NUM> may also be operated in relation to a network storage device that performs the storage function of the memory <NUM> over a network, such as the Internet.

The controller <NUM> may typically control the general operations of the mobile terminal <NUM>. For example, the controller <NUM> may set or release a lock state for restricting a user from inputting a control command with respect to applications when a status of the mobile terminal meets a preset condition.

The power supply unit <NUM> receives external power or provide internal power and supply the appropriate power required for operating respective elements and components included in the mobile terminal <NUM>. The power supply unit <NUM> may include a battery, which is typically rechargeable or be detachably coupled to the terminal body for charging.

The power supply unit <NUM> may include a connection port. The connection port may be configured as one example of the interface unit <NUM> to which an external charger for supplying power to recharge the battery is electrically connected.

Various embodiments described herein may be implemented in a computer-readable medium, a machine-readable medium, or similar medium using, for example, software, hardware, or any combination thereof.

Referring now to <FIG> and <FIG>, the mobile terminal <NUM> is described with reference to a bar-type terminal body. However, the mobile terminal <NUM> may alternatively be implemented in any of a variety of different configurations. Examples of such configurations include watch-type, clip-type, glasses-type, or as a folder-type, flip-type, slide-type, swing-type, and swivel-type in which two and more bodies are combined with each other in a relatively movable manner, and combinations thereof. Discussion herein will often relate to a particular type of mobile terminal (for example, bar-type, watch-type, glasses-type, and the like). However, such teachings with regard to a particular type of mobile terminal will generally apply to other types of mobile terminals as well.

The mobile terminal <NUM> will generally include a case (for example, frame, housing, cover, and the like) forming the appearance of the terminal. In this embodiment, the case is formed using a front case <NUM> and a rear case <NUM>. Various electronic components are incorporated into a space formed between the front case <NUM> and the rear case <NUM>. At least one middle case may be additionally positioned between the front case <NUM> and the rear case <NUM>.

The display unit <NUM> is shown located on the front side of the terminal body to output information. As illustrated, a window 151a of the display unit <NUM> may be mounted to the front case <NUM> to form the front surface of the terminal body together with the front case <NUM>.

In some embodiments, electronic components may also be mounted to the rear case <NUM>. Examples of such electronic components include a detachable battery <NUM>, an identification module, a memory card, and the like. Rear cover <NUM> is shown covering the electronic components, and this cover may be detachably coupled to the rear case <NUM>. Therefore, when the rear cover <NUM> is detached from the rear case <NUM>, the electronic components mounted to the rear case <NUM> are externally exposed.

As illustrated, when the rear cover <NUM> is coupled to the rear case <NUM>, a side surface of the rear case <NUM> is partially exposed. In some cases, upon the coupling, the rear case <NUM> may also be completely shielded by the rear cover <NUM>. In some embodiments, the rear cover <NUM> may include an opening for externally exposing a camera 121b or an audio output module 152b.

The cases <NUM>, <NUM>, <NUM> may be formed by injection-molding synthetic resin or may be formed of a metal, for example, stainless steel (STS), aluminum (Al), titanium (Ti), or the like.

As an alternative to the example in which the plurality of cases form an inner space for accommodating components, the mobile terminal <NUM> may be configured such that one case forms the inner space. In this example, a mobile terminal <NUM> having a unibody is formed in such a manner that synthetic resin or metal extends from a side surface to a rear surface.

If desired, the mobile terminal <NUM> may include a waterproofing unit (not shown) for preventing introduction of water into the terminal body. For example, the waterproofing unit may include a waterproofing member which is located between the window 151a and the front case <NUM>, between the front case <NUM> and the rear case <NUM>, or between the rear case <NUM> and the rear cover <NUM>, to hermetically seal an inner space when those cases are coupled.

<FIG> and <FIG> depict certain components as arranged on the mobile terminal. However, it is to be understood that alternative arrangements are possible and within the teachings of the instant disclosure. Some components may be omitted or rearranged. For example, the first manipulation unit 123a may be located on another surface of the terminal body, and the second audio output module 152b may be located on the side surface of the terminal body.

The display unit <NUM> outputs information processed in the mobile terminal <NUM>. The display unit <NUM> may be implemented using one or more suitable display devices. Examples of such suitable display devices include a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT-LCD), an organic light emitting diode (OLED), a flexible display, a <NUM>-dimensional (3D) display, an e-ink display, and combinations thereof.

The display unit <NUM> may be implemented using two display devices, which can implement the same or different display technology. For instance, a plurality of the display units <NUM> may be arranged on one side, either spaced apart from each other, or these devices may be integrated, or these devices may be arranged on different surfaces.

The display unit <NUM> may also include a touch sensor which senses a touch input received at the display unit. When a touch is input to the display unit <NUM>, the touch sensor may be configured to sense this touch and the controller <NUM>, for example, may generate a control command or other signal corresponding to the touch. The content which is input in the touching manner may be a text or numerical value, or a menu item which can be indicated or designated in various modes.

The touch sensor may be configured in a form of a film having a touch pattern, disposed between the window 151a and a display on a rear surface of the window 151a, or a metal wire which is patterned directly on the rear surface of the window 151a. Alternatively, the touch sensor may be integrally formed with the display. For example, the touch sensor may be disposed on a substrate of the display or within the display.

The display unit <NUM> may also form a touch screen together with the touch sensor. Here, the touch screen may serve as the user input unit <NUM> (see <FIG>). Therefore, the touch screen may replace at least some of the functions of the first manipulation unit 123a.

The first audio output module 152a may be implemented in the form of a speaker to output voice audio, alarm sounds, multimedia audio reproduction, and the like.

The window 151a of the display unit <NUM> will typically include an aperture to permit audio generated by the first audio output module 152a to pass. One alternative is to allow audio to be released along an assembly gap between the structural bodies (for example, a gap between the window 151a and the front case <NUM>). In this case, a hole independently formed to output audio sounds may not be seen or is otherwise hidden in terms of appearance, thereby further simplifying the appearance and manufacturing of the mobile terminal <NUM>.

The optical output module <NUM> can be configured to output light for indicating an event generation. Examples of such events include a message reception, a call signal reception, a missed call, an alarm, a schedule notice, an email reception, information reception through an application, and the like. When a user has checked a generated event, the controller can control the optical output unit <NUM> to stop the light output.

The first camera 121a can process image frames such as still or moving images obtained by the image sensor in a capture mode or a video call mode. The processed image frames can then be displayed on the display unit <NUM> or stored in the memory <NUM>.

The first and second manipulation units 123a and 123b are examples of the user input unit <NUM>, which may be manipulated by a user to provide input to the mobile terminal <NUM>. The first and second manipulation units 123a and 123b may also be commonly referred to as a manipulating portion, and may employ any tactile method that allows the user to perform manipulation such as touch, push, scroll, or the like. The first and second manipulation units 123a and 123b may also employ any non-tactile method that allows the user to perform manipulation such as proximity touch, hovering, or the like.

<FIG> illustrates the first manipulation unit 123a as a touch key, but possible alternatives include a mechanical key, a push key, a touch key, and combinations thereof.

Input received at the first and second manipulation units 123a and 123b may be used in various ways. For example, the first manipulation unit 123a may be used by the user to provide an input to a menu, home key, cancel, search, or the like, and the second manipulation unit 123b may be used by the user to provide an input to control a volume level being output from the first or second audio output modules 152a or 152b, to switch to a touch recognition mode of the display unit <NUM>, or the like.

As another example of the user input unit <NUM>, a rear input unit (not shown) may be located on the rear surface of the terminal body. The rear input unit can be manipulated by a user to provide input to the mobile terminal <NUM>. The input may be used in a variety of different ways. For example, the rear input unit may be used by the user to provide an input for power on/off, start, end, scroll, control volume level being output from the first or second audio output modules 152a or 152b, switch to a touch recognition mode of the display unit <NUM>, and the like. The rear input unit may be configured to permit touch input, a push input, or combinations thereof.

The rear input unit may be located to overlap the display unit <NUM> of the front side in a thickness direction of the terminal body. As one example, the rear input unit may be located on an upper end portion of the rear side of the terminal body such that a user can easily manipulate it using a forefinger when the user grabs the terminal body with one hand. Alternatively, the rear input unit can be positioned at most any location of the rear side of the terminal body.

Embodiments that include the rear input unit may implement some or all of the functionality of the first manipulation unit 123a in the rear input unit. As such, in situations where the first manipulation unit 123a is omitted from the front side, the display unit <NUM> can have a larger screen.

As a further alternative, the mobile terminal <NUM> may include a finger scan sensor which scans a user's fingerprint. The controller <NUM> can then use fingerprint information sensed by the finger scan sensor as part of an authentication procedure. The finger scan sensor may also be installed in the display unit <NUM> or implemented in the user input unit <NUM>.

The microphone <NUM> is shown located at an end of the mobile terminal <NUM>, but other locations are possible. If desired, multiple microphones may be implemented, with such an arrangement permitting the receiving of stereo sounds.

The interface unit <NUM> may serve as a path allowing the mobile terminal <NUM> to interface with external devices. For example, the interface unit <NUM> may include one or more of a connection terminal for connecting to another device (for example, an earphone, an external speaker, or the like), a port for near field communication (for example, an Infrared Data Association (IrDA) port, a Bluetooth port, a wireless LAN port, and the like), or a power supply terminal for supplying power to the mobile terminal <NUM>. The interface unit <NUM> may be implemented in the form of a socket for accommodating an external card, such as Subscriber Identification Module (SIM), User Identity Module (UIM), or a memory card for information storage.

The second camera 121b is shown located at the rear side of the terminal body and includes an image capturing direction that is substantially opposite to the image capturing direction of the first camera unit 121a. If desired, second camera 121a may alternatively be located at other locations, or made to be moveable, in order to have a different image capturing direction from that which is shown.

The second camera 121b can include a plurality of lenses arranged along at least one line. The plurality of lenses may also be arranged in a matrix configuration. The cameras may be referred to as an "array camera. " When the second camera 121b is implemented as an array camera, images may be captured in various manners using the plurality of lenses and images with better qualities.

As shown in <FIG>, a flash <NUM> is shown adjacent to the second camera 121b. When an image of a subject is captured with the camera 121b, the flash <NUM> may illuminate the subject.

As shown in <FIG>, the second audio output module 152b can be located on the terminal body. The second audio output module 152b may implement stereophonic sound functions in conjunction with the first audio output module 152a, and may be also used for implementing a speaker phone mode for call communication.

At least one antenna for wireless communication may be located on the terminal body. The antenna may be installed in the terminal body or formed by the case. For example, an antenna which configures a part of the broadcast receiving module <NUM> may be retractable into the terminal body. Alternatively, an antenna may be formed using a film attached to an inner surface of the rear cover <NUM>, or a case that includes a conductive material.

A power supply unit <NUM> for supplying power to the mobile terminal <NUM> may include a battery <NUM>, which is mounted in the terminal body or detachably coupled to an outside of the terminal body. The battery <NUM> may receive power via a power source cable connected to the interface unit <NUM>. Also, the battery <NUM> can be recharged in a wireless manner using a wireless charger. Wireless charging may be implemented by magnetic induction or electromagnetic resonance.

The rear cover <NUM> is shown coupled to the rear case <NUM> for shielding the battery <NUM>, to prevent separation of the battery <NUM>, and to protect the battery <NUM> from an external impact or from foreign material. When the battery <NUM> is detachable from the terminal body, the rear case <NUM> may be detachably coupled to the rear case <NUM>.

An accessory for protecting an appearance or assisting or extending the functions of the mobile terminal <NUM> can also be provided on the mobile terminal <NUM>. As one example of an accessory, a cover or pouch for covering or accommodating at least one surface of the mobile terminal <NUM> may be provided. The cover or pouch may cooperate with the display unit <NUM> to extend the function of the mobile terminal <NUM>. Another example of the accessory is a touch pen for assisting or extending a touch input to a touch screen.

<FIG> is a flowchart of a process for registering an iris image. In particular, <FIG> is a diagram of a process for registering a first iris image, which becomes a basis for determining whether a second iris image is forged, at a memory of a mobile device. A mobile device described with reference to <FIG> can be supplementarily construed by referring to the mobile terminal described with reference to <FIG>.

Referring to <FIG>, if a registration of a first iris image starts [S200], a camera detects an iris image by photographing user's eye region [S201].

Generally, in an environment with a considerably high or low illuminance, it is difficult to detect an iris image correctly. Hence, a controller of a mobile device senses an external illuminance by controlling an illuminance sensor and then determines whether the external illuminance is <NUM> ~ <NUM>1x for example [S202].

Subsequently, the controller determines a presence or non-presence of a naked eye based on the detected iris image [S203]. While a user ears an accessory such as glasses or the like, it is difficult to perform an accurate iris authentication process due to such an effect as a light reflection by lens or the like.

Subsequently, the controller determines whether the detected iris image is an iris image in a static state without motion [S204]. Since iris authentication is performed in various external environments, an iris registering process for iris authentication requires an iris image of high quality.

After the steps S201 to S204, the detected first iris image is registered as a normal iris image [S205]. If any one of the steps S202 to S204 is determined as inappropriate by the controller, the controller controls an iris image to be detected again.

<FIG> is a flowchart of a process for implementing an invention according to first to fifth embodiments of the present invention. In the following description, on the assumption that a first iris image is registered (e.g., the process mentioned in <FIG>), a process for detecting a second iris image and then determining whether the detected second iris image matches the first iris image and whether the detected second iris image is forged is described. Particularly, an iris forgery determining process varying according to an external illuminance environment shall be described.

The method invention shown in <FIG> shall be schematically described with reference to the mobile device (e.g., mobile terminal) shown in <FIG>.

First of all, the first iris image is registered at the memory <NUM> shown in <FIG> and the illumination sensor <NUM> senses an external illuminance of the mobile device <NUM>.

Furthermore, the display <NUM> shown in <FIG> emits light from a preset region and the camera <NUM> detects a second iris image or a pupil image.

The controller <NUM> controls the memory <NUM>, the illumination sensor <NUM>, the camera <NUM> and the display <NUM> and further displays a message, which guides a variation of an eye by controlling the display <NUM> according to the external illuminance sensed by the illumination sensor <NUM>. The message for guiding the variation of the eye is characterized in being changed according to the sensed external illuminance for example.

Details will be described with reference to <FIG> as follows.

First of all, a liveness text is the test for determining whether the detected second iris image is forged, and more particularly, whether a size or location of user's pupil is changed on a specific condition. So to speak, it is determined whether the corresponding pupil is a live pupil that is not forged.

In <FIG>, a step S301 of photographing a second iris image, a step S302 of determining a match to a registered first iris image, a step S303 of sensing an external illuminance by an illumination sensor, and steps S310 to S335 of determining whether a second iris image is forged according to the external illuminance are experimentally performed within <NUM>.

In the following description, an indoor illuminance environment without illumination, an indoor illuminance environment with illumination and an outdoor illuminance environment are set to a first range (below <NUM> lx), a second range (<NUM> ~ <NUM>1x) and a third range (above <NUM>,<NUM> lx), respectively. Furthermore, the first to third ranges can be set differently by a mobile device user in advance and are the experimental values to describe the present invention.

A case that the external illuminance belongs to the first range is described as follows [S310 to S315].

The controller controls the illumination sensor to sense an external illuminance and determines whether the external illuminance belongs to the first range [S310]. In an external illuminance environment corresponding to the first range, whether the second iris image is forged is determined by a method of detecting a size change of a pupil according to display brightness and a method of detecting a movement (vision line) of a pupil.

First of all, in a state that display brightness is set to a maximum value by the controller, a pupil is primarily detected through the camera [S311]. Subsequently, the controller sets the display brightness to a minimum value [S312] and then detects the pupil through the camera secondarily [S313].

Alternatively, the controller controls the camera to determine whether the pupil is moving along a path displayed on a prescribed region of the display [S312].

The controller compares a size of the primarily detected pupil to that of the secondarily detected pupil or determines whether the pupil moves along the path [S314]. According to the determination, if the second iris image is determined as not forged, the authentication is completed [S315].

The steps S311 to S314 shall be described in detail with reference to <FIG> later.

A case that the external illuminance belongs to the second range is described as follows [S320 to S325].

The controller controls the illumination sensor to sense an external illuminance and determines whether the external illuminance belongs to the second range [S320]. In an external illuminance environment corresponding to the second range, whether the second iris image is forged is determined by a method of detecting a size change of a pupil according to a size of an object and a method of detecting a movement (vision line) of a pupil.

First of all, when a user gazes at a first icon displayed on a prescribed region of a display, a pupil is primarily detected through the camera [S321]. Subsequently, the controller displays a second icon, which has the same shape of the first icon but differs from the first icon in size, on a prescribed region of the display [S322], enables the user to gaze at the second icon, and then detects the pupil through the camera secondarily [S323].

Alternatively, the controller controls the camera to determine whether the pupil is moving along a path displayed on the prescribed region of the display [S322].

The controller compares a size of the primarily detected pupil to that of the secondarily detected pupil or determines whether the pupil moves along the path [S324]. According to the determination, if the second iris image is determined as not forged, the authentication is completed [S325].

The steps S321 to S324 shall be described in detail with reference to <FIG> later.

A case that the external illuminance belongs to the third range is described as follows [S330 to S335].

The controller controls the illumination sensor to sense an external illuminance and determines whether the external illuminance belongs to the third range [S330]. In an external illuminance environment corresponding to the third range, whether the second iris image is forged is determined by a method of detecting a size change of a pupil according to a focal distance.

First of all, when a user gazes at a display illumination region, a pupil is primarily detected through the camera [S331]. Subsequently, the controller enables the user to gaze at a remote object [S332] and then detects the pupil through the camera secondarily [S333].

The controller compares a size of the primarily detected pupil to that of the secondarily detected pupil [S334]. Accordingly, if the second iris image is determined as not forged, the authentication is completed [S335].

The steps S331 to S334 shall be described in detail with reference to <FIG> and <FIG> later.

According to another embodiment of the present invention, depending on a security level of a function desired to be performed through a mobile device, as shown in Table <NUM>, a determination through a detection of a pupil size variation or both a determination through a detection of a pupil size variation and a determination of a presence or non-presence of a movement of a pupil can be set to be requested by a user in advance.

According to further embodiment of the present invention, in case that the present invention applies to an operation of unlocking a mobile device, an iris authentication process can be progressed only if a user's action of pushing a home button precedes. Generally, while a display is turned off, a user often gazes at a display screen instead of a mirror. Hence, in this case, a lock screen is maintained to cope with user's intention.

<FIG> and <FIG> are diagrams of a process for detecting a size of a pupil in association with the first embodiment of the present invention. With reference to <FIG> and <FIG>, a process for determining whether a second iris image is forged by detecting a variation of a size of a pupil according to display brightness is described in detail as follows.

Generally, a size of a pupil varies <NUM> to <NUM> according to external illuminance. Using such a pupil property, it is able to make a determination of a presence or non-presence of a forgery of a second iris image.

According to a first embodiment of the present invention shown in <FIG>, if an external illuminance sensed by an illumination sensor (not shown) belongs to a first range, a controller controls a display to enable a brightness of an illumination region <NUM> to have a maximum value.

A message <NUM> indicating that 'Gaze at an illumination region of a screen. ' is displayed on a prescribed region of the display, and a user then gazes at an illumination icon <NUM> displayed on the illumination region <NUM>. In doing so, a camera <NUM> photographs a user's eye region <NUM> and the controller primarily detects a size of a pupil <NUM> reduced within the eye region <NUM>.

According to a second embodiment of the present invention shown in <FIG>, the controller controls the display to enable the brightness of the illumination region <NUM> to have a minimum value.

The message <NUM> indicating that 'Gaze at an illumination region of a screen. ' is displayed on the prescribed region of the display, and the user then gazes at the illumination icon <NUM> displayed on the illumination region <NUM>. In doing so, the camera <NUM> photographs the user's eye region <NUM> and the controller secondarily detects a size of the pupil <NUM> enlarged within the eye region <NUM>.

Based on the primarily and secondarily detected pupil images, the controller calculates a size variation of the pupil and then determines whether the calculated size variation is equal to or greater than a preset threshold.

If the calculated size variation is equal to or greater than the preset threshold, the controller completes the authentication by determining that a second iris image is not forged. On the contrary, if the calculated size variation is smaller than the preset threshold, the controller outputs a message indicating a failure of the authentication by determining that the second iris image is forged and controls the iris image to be taken again. In doing so, the outputted message may include a message of vibration or the like for example.

According to another example of the first embodiment of the present invention, as a display brightness is changed, the controller consecutively detects size variations of the pupil. In particular, by changing the brightness of the illumination region <NUM> from a maximum value to a minimum value, the controller can consecutively detect the size of the pupil <NUM>. As the controller consecutively detect the size of the pupil <NUM>, it is possible to determine a presence or non-presence of a forgery of a second iris with accuracy higher than that of a case of detecting the size twice.

<FIG> and <FIG> are diagrams of a process for detecting a movement of a pupil in association with the second embodiment of the present invention.

First of all, if an external illuminance sensed by an illumination sensor (not shown) belongs to a first range, a controller controls a display to enable a brightness of an illumination region <NUM> to have a maximum value and is able to determine whether a second iris image is forged by detecting a location change of a pupil.

In order to detect the location change of the pupil, a vision line detecting method by corneal reflex may apply thereto. Namely, if a near infrared light is applied to an eye region by a near infrared LED <NUM>, a camera <NUM> detects a light reflected by a cornea. As a location of a reflective point <NUM> is displayed on a display, a controller can detect a movement of the pupil.

Referring to <FIG>, the controller determines whether the pupil moves along a path <NUM> displayed on the illumination region <NUM> of the display. For instance, an illumination icon <NUM> displayed on the illumination region <NUM> moves along a path <NUM> that is set randomly. If the controller outputs a message indicating 'Gaze along a moving illumination region of a screen', a user moves a vision line along a movement of the illumination icon <NUM>. In doing so, the controller determines whether the reflective point <NUM> of the pupil accurately moves along the illumination icon <NUM>.

If the reflective point <NUM> of the pupil accurately moves along the illumination icon <NUM>, the controller completes the authentication by determining that the second iris image is not forged. On the contrary, if the illumination icon <NUM> fails to move accurately, the controller outputs a message indicating a failure of the authentication by determining that the second iris image is forged and controls an iris image to be taken again. In doing so, the outputted message may include a message of vibration or the like for example.

Meanwhile, according to another example of the second embodiment of the present invention, the path <NUM> may include a specific path configured by a mobile device user in advance instead of the random path. Thus, according to another example of the second embodiment of the present invention, a higher security level can be set for the technology of an iris authentication or an iris forgery prevention.

According to further example of the second embodiment of the present invention, a controller can detect a size change of a pupil according to a display brightness as soon as detect a location change of the pupil. In particular, the pupil is primarily detected by setting the display brightness to a maximum value [cf. <FIG>], and is then secondarily detected by setting the display brightness to a minim value [cf. In the course of the primary and secondary detections, it is also detected whether a location of the pupil is changed along the path <NUM> displayed on the illumination region <NUM> of the display. For reference, the following description is made in comparison between <FIG> and <FIG>. The display brightness of the illumination region <NUM> shown in <FIG> is the maximum value, while the display brightness of the illumination region <NUM> shown in <FIG> is the minimum value.

<FIG> are diagrams of a process for detecting a size of a pupil in association with the third embodiment of the present invention. A pupil size change according to a display brightness has been described with reference to <FIG> and <FIG> already. A size change of a pupil according to a focal distance change shall be described in detail with reference to <FIG> as follows.

First of all, a size of a pupil normally changes according to a focal distance. In particular, the pupil increases on looking at a far object, or decreases on looking at a near object. If an external illumination belongs to a second range, a size change of the pupil according to a display brightness may be greater than that of the pupil according to a focal distance. Hence, using such a property of the pupil, it is able to determine whether a second iris image is forged.

According to a third embodiment of the present invention shown in <FIG>, if an external illuminance sensed by an illumination sensor (not shown) belongs to a second range, a controller controls a display to enable a brightness of an illumination region <NUM> to have a maximum value.

The controller controls the display to output a message <NUM> 'Gaze at an icon of a screen'. If a user gazes at a first icon <NUM> within the illumination region <NUM>, a camera <NUM> captures a user's eye region. The controller primarily detects a size of a pupil <NUM> from the captured eye region.

In doing so, a size of the first icon <NUM> is set to a minimum value. As the user looks at the first icon <NUM>, it brings an effect of looking at a far object, i.e., an effect of increasing a focal distance. As the focal distance is increased, the pupil is enlarged.

According to another example of the third embodiment of the present invention, it may have an effect that a focal distance is increased through a reflective mirror <NUM>. In case that the user gazes at the reflective mirror, since an image becomes focused at a location amounting to a twice of a distance between the pupil and the mirror, it brings an effect of increasing the focal distance.

When it is difficult to look at a far object in a room or it is inconvenient to look at a far object after gazing at a near mobile device, according to another example of the third embodiment of the present invention, it may bring an effect of increasing a focal distance.

The reflective mirror <NUM> may be separately provided to a prescribed region of the mobile device. Alternatively, the reflective mirror <NUM> may be provided as a camera having a filter of a mirror property installed therein. In particular, unlike <FIG>, the camera <NUM> and the reflective mirror <NUM> may be provided as a single configuration to the mobile device.

According to a third embodiment of the present invention shown in <FIG>, the controller controls the display to enable a brightness of the illumination region <NUM> to have a minimum value.

The controller controls the display to output a message <NUM> 'Gaze at an icon of a screen'. If a user gazes at a second icon <NUM> within the illumination region <NUM>, the camera <NUM> captures a user's eye region. The controller secondarily detects a size of the pupil <NUM> from the captured eye region.

In doing so, although the second icon <NUM> has the same shape of the first icon <NUM>, a size of the second icon <NUM> is set to a maximum value. As the user looks at the second icon <NUM>, it brings an effect of looking at a near object, i.e., an effect of decreasing a focal distance. As the focal distance is decreased, the pupil is reduced.

Meanwhile, according to another example of the third embodiment of the present invention, in response to a change of a focal distance, the controller consecutively detects size changes of the pupil. In particular, by changing the size from the first icon <NUM> to the second icon <NUM>, the controller consecutively detects the size of the pupil <NUM>. As the controller consecutively detect the size of the pupil <NUM>, it is possible to determine a presence or non-presence of a forgery of the second iris with accuracy higher than that of a case of detecting the size twice.

<FIG> and <FIG> are diagrams of a process for detecting a movement of a pupil in association with the fourth embodiment of the present invention.

First of all, if an external illuminance sensed by an illumination sensor (not shown) belongs to a second range, a controller controls a display to enable a brightness of an illumination region <NUM> to have a maximum value and is able to determine whether a second iris image is forged by detecting a location change of a pupil.

Referring to <FIG>, the controller determines whether the pupil moves along a path <NUM> displayed on the illumination region <NUM> of the display. For instance, an icon <NUM> displayed on the illumination region <NUM> moves along a path <NUM> that is set randomly. If the controller outputs a message indicating 'Gaze along a moving illumination region of a screen', a user moves a vision line along a movement of the icon <NUM>. In doing so, the controller determines whether the reflective point <NUM> of the pupil accurately moves along the icon <NUM>.

If the reflective point <NUM> of the pupil accurately moves along the icon <NUM>, the controller completes the authentication by determining that the second iris image is not forged. On the contrary, if the icon <NUM> fails to move accurately, the controller outputs a message indicating a failure of the authentication by determining that the second iris image is forged and controls an iris image to be taken again. In doing so, the outputted message may include a message of vibration or the like for example.

Meanwhile, according to another example of the fourth embodiment of the present invention, the path <NUM> may include a specific path configured by a mobile device user in advance instead of the random path. Thus, according to the fourth embodiment of the present invention, a higher security level can be set for the technology of an iris authentication or an iris forgery prevention.

According to further example of the fourth embodiment of the present invention, a controller can detect a size change of a pupil according to a display brightness as soon as detect a location change of the pupil. In particular, the pupil is primarily detected by setting a display brightness to a maximum value and also setting a size of the icon <NUM> to a minimum value [cf. <FIG>], and is then secondarily detected by setting the display brightness to a minim value [cf. In the course of the primary and secondary detections, it is also detected whether a location of the pupil is changed along the path <NUM> displayed on the illumination region <NUM> of the display.

For reference, the following description is made in comparison between <FIG> and <FIG>. The display brightness of the illumination region <NUM> shown in <FIG> is the maximum value, while the display brightness of the illumination region <NUM> shown in <FIG> is the minimum value.

<FIG> and <FIG> are diagrams of a process for detecting a size of a pupil in association with the fifth embodiment of the present invention. With reference to <FIG> and <FIG>, if an external illuminance belongs to a third range, a method of determining whether a second iris image is forged is described in detail as follows.

First of all, since a size of a pupil is reduced due to a very high illuminance (e.g., <NUM>,<NUM> lx or higher) in an outdoor illumination environment belonging to a third range, it is difficult to detect a size change of the pupil despite changing a display brightness of a mobile device. Moreover, due to a strong white light in an outdoor environment, it is difficult to accurately detect a location of the pupil by an IR light source. Hence, it is efficient to detect a pupil size change according to a focal distance.

According to a fifth embodiment of the present invention shown in <FIG>, if an external illuminance detected by an illumination sensor (not shown) belongs to a third range, the controller controls a display to enable a brightness of the illumination region <NUM> to have a maximum value.

The controller controls the display to output a message <NUM> 'Gaze at an illumination region of a screen'. If a user gazes at an illumination icon <NUM> within the illumination region <NUM>, the camera <NUM> captures a user's eye region <NUM>. The controller primarily detects a size of the pupil <NUM> from the captured eye region.

In doing so, since the user gazes at a near object, a size of the pupil is reduced by the principle of the pupil size change according to a focal distance, which is described with reference to <FIG>.

According to the fifth embodiment of the present invention shown in <FIG>, the controller outputs a message <NUM> 'Gaze at a far object'. According to the message, if the user gazes at the far object <NUM>, the controller controls the camera to capture a user's eye region and then secondarily detect the size of the pupil from the captured eye region.

Terminologies used for the present invention are defined in consideration function in the present invention and may vary according to intentions, practices and the like of technicians working in the corresponding fields. Hence, the definitions should be made based on the overall contents of the present invention.

The above-described present invention can be implemented in a program recorded medium as computer-readable codes. The computer-readable media may include all kinds of recording devices in which data readable by a computer system are stored. The computer-readable media may include HDD (hard disk drive), SSD (solid state disk), SDD (silicon disk drive), ROM, RAM, CD-ROM, magnetic tapes, floppy discs, optical data storage devices, and the like for example and also include carrier-wave type implementations (e.g., transmission via Internet). Further, the computer may include a controller of a mobile device.

Various modes for the present invention was described in the above "Best Mode".

Claim 1:
A mobile device (<NUM>), comprising:
a memory (<NUM>) configured to register and store a first iris image;
an illumination sensor (<NUM>) configured to sense an external illuminance of the mobile device;
a display (<NUM>) configured to emit a light from a preset region;
a camera (<NUM>) configured to detect either a second iris image or a pupil image; and
a controller (<NUM>) configured to:
control the memory (<NUM>), the illumination sensor (<NUM>), the camera (<NUM>) and the display (<NUM>),
- control the illumination sensor (<NUM>) to sense the external illuminance of the mobile device,
if the sensed external illuminance belongs to a preset first range:
- control (<NUM>) the display (<NUM>) to set the display brightness to a maximum value and primarily detects the pupil image through the camera (<NUM>), and
- control (<NUM>, <NUM>) the display (<NUM>) to set the display brightness to a minimum value and secondarily detect the pupil image through the camera (<NUM>), if the sensed external illuminance belongs to a preset second range greater than the preset first range (<NUM>):
- display a message for guiding a user to gaze at a first icon displayed on a prescribed region of the display,
- control (<NUM>) the camera (<NUM>) to primarily detect the pupil image,
- display (<NUM>) a message for guiding the user to gaze at a second icon displayed on the prescribed region of the display (<NUM>), wherein each of the first icon and the second icon has a same shape, and wherein a first icon size is different from a second icon size, and
- control (<NUM>) the camera (<NUM>) to secondarily detect the pupil image,
if the sensed external illuminance belongs to a preset third range greater than the preset second range:
- display a message for guiding a user to gaze at a third icon displayed on a prescribed region of the display,
- control (<NUM>) the camera (<NUM>) to primarily detect the pupil image,
- display (<NUM>) a message for guiding the user to gaze at a far object, and
- control (<NUM>) the camera (<NUM>) to secondarily detect the pupil image,
wherein the controller is further configured to:
determine (<NUM>, <NUM>, <NUM>) whether a size variation of the pupil is equal to or greater than a preset threshold based on the primarily and secondarily detected pupil images,
determine (<NUM>, <NUM>, <NUM>, <NUM>) whether the second iris image is forged according to the determination, and
display a result of the determination through the display (<NUM>).