KR20060057085A - Mobile phone and method for identifying user - Google Patents

Abstract

The present invention provides a mobile communication terminal and a method for authenticating a user using a body image of a user photographed with a built-in camera, and for storing outline information of a body extracted from a body image of the user photographed with a camera. Storage unit; A black and white conversion unit for converting the body image of the color captured by the camera into a black and white image; An outline extracting unit for extracting outline information of the body from the black and white body image converted by the black and white converter; And controlling the black and white converting unit to change the body image of the color captured by the camera into a black and white image, controlling the outline extracting unit to extract the outline information of the body from the black and white body image converted by the black and white converting unit, and extracting the outline. And a controller configured to compare whether the outline information of the body extracted by the unit is the same as the outline information of the body stored in the storage unit and to control the release of the lock according to whether the outline information is the same.

Camera, Mobile Phone, Facial Expression, Mobile Phone, Authentication

Description

Mobile terminal and method for user authentication {Mobile phone and method for identifying user}

1 is a block diagram of a mobile communication terminal for user authentication according to an embodiment of the present invention.

2A and 2B are exemplary views illustrating a user authentication process of a mobile communication terminal according to an embodiment of the present invention.

3 is a flowchart illustrating a user authentication method of a mobile communication terminal according to an embodiment of the present invention.

4 is a block diagram of a mobile communication terminal for user authentication according to another embodiment of the present invention.

5A and 5B are exemplary diagrams illustrating a user authentication process of a mobile communication terminal according to another embodiment of the present invention.

6 is a flowchart illustrating a user authentication method of a mobile communication terminal according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100, 200: mobile communication terminal 110, 210: keypad

111, 211: memory 112, 212: camera

113, 213: Control part 114, 214: LCD screen

115, 215: radio frequency processor 116, 216: speaker

117, 217: microphone 118, 218: monochrome conversion unit

119, 219: outline extraction unit

The present invention relates to a mobile communication terminal and a method for authenticating a user, and more particularly, to a mobile communication terminal and a method for authenticating a user by using an image captured by a built-in camera.

Recently, many users use the lock setting function to prevent their mobile communication terminal from being used by others or stealing confidential information stored therein. For example, Korean Patent Application No. 2003-006713 proposes a method for setting a lock function in a mobile communication terminal using a unique number as a method for preventing the mobile terminal from being stolen by another person.

In addition, the mobile communication terminal is widely used as a payment method in electronic commerce. Looking at the payment method for this, the cyber money is purchased from the mobile communication terminal payment service provider in cyberspace and billed by integrating with the communication fee of the communication service provider. billing). That is, the user applies for cyber money by accessing a payment service provider through the Internet for mobile terminal payment. In this case, when the number and various information of the mobile communication terminal to be settled are entered, the settlement service provider requests the authentication by accessing the corresponding telecommunications company and authorizes the purchase of cyber money to the user. Subsequently, the user requests to purchase a product by accessing a cyber shopping mall or a content provider on the Internet using the purchased cyber money. The cyber shopping mall or the content provider requests payment from the payment service provider who issued the cyber money in response to the user's purchase request of the product, and when the payment service provider approves the payment, the user purchases the product and provides the product.

In the payment method using the mobile communication terminal, the user authentication is performed when the cyber money is purchased and the product is purchased to prevent illegal use by a third party. To this end, in the past, a user was authenticated using a password. In the conventional authentication method using a password, if a user forgets the password, the user cannot be authenticated, and the password is exposed and sometimes used by a third party. .

In order to solve this problem, Korean Patent Application No. 2001-0070949 has proposed a technology for performing user authentication using a user's fingerprint. Looking at the configuration of a conventional mobile communication terminal implementing this technology briefly, a user command input unit for inputting a user command for fingerprint input and recognition, a fingerprint recognition unit for recognizing a user's fingerprint, and a user command input unit Controls the registration and deletion of the fingerprint input through the fingerprint recognition unit according to the user's command by the user, and authenticates the user's fingerprint input through the fingerprint recognition unit in accordance with the fingerprint authentication request of the mobile communication terminal of the present invention A fingerprint processing control unit provided with a fingerprint control unit, a fingerprint information storage unit for storing the fingerprint code information provided from the fingerprint processing control unit, and receiving information on a fingerprint authentication request of the mobile communication terminal and passing the received information to the fingerprint processing control unit; The fingerprint authentication information for the fingerprint authentication result authenticated by the mobile communication terminal And a unit for transmitting fingerprint information transmitted and received.

However, in the conventional mobile communication terminal as described above, an expensive fingerprint recognition element must be provided separately, resulting in an increase in the price of the product, and there is a problem of complicating the internal and external configurations of the mobile communication terminal.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a mobile communication terminal and a method for authenticating a user by using a user's palm image captured by a built-in camera.

Another object of the present invention is to provide a mobile communication terminal and a method for authenticating a user by using a face image of a user photographed with a built-in camera.

Another object of the present invention is to provide a mobile communication terminal and method that can increase the utilization of the built-in camera by authenticating a user using the built-in camera.

In order to achieve the above object, the present invention provides a mobile communication terminal for capturing an image through a built-in camera and setting and canceling a lock function according to a control command input through a keypad. A storage unit for storing outline information of the body extracted from the body image; A black and white conversion unit for converting the body image of the color photographed by the camera into a black and white image; An outline extracting unit for extracting outline information of the body from the black and white body image converted by the black and white converter; And controlling the black and white converting unit to change the body image of the color photographed by the camera into a black and white image, and controlling the outline extracting unit to extract the outline information of the body from the black and white body image converted by the black and white converting unit. And a controller for controlling the release of the lock according to whether the outline information of the body extracted by the outline extracting unit is the same as the outline information of the body stored in the storage unit.

According to the present invention, in accordance with a control command input through a keypad, a mobile communication terminal captures an image through a built-in camera and sets and cancels a lock function. According to an authentication information input command, an authentication information input mode is set. A first step of extracting and storing outline information of the body from the body image of the user photographed through the camera; Setting a lock according to the lock command; A third step of capturing a body image of the user through the camera and extracting outline information of the body from the captured body image when the lock release command is input in the set lock state; And a fourth step of comparing the stored outline information of the body with the same information of the extracted body outline and releasing the set lock if the comparison result is the same.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a block diagram of a mobile communication terminal for user authentication according to an embodiment of the present invention.

Referring to FIG. 1, the mobile communication terminal 100 of the present invention includes a keypad 110 for inputting a user command related to user authentication, a lock command, a call service, various additional services, and the like, and texts and various types. A memory 111 for storing image information, a camera 112 for capturing a person's palm or face, and various images, and according to a user's instruction input through the keypad 110, The control unit 113 and the character transmitted by the control unit 113, which controls image shooting, controls the lock setting of the mobile communication terminal 100, controls user authentication, and controls the provision of calls and various additional services. And a liquid crystal display (LCD) 114 for displaying image information, and a baseband signal transmitted by the control unit 113 to a high frequency signal for transmission to the outside, and a high frequency signal received through a base station. A radio frequency processor 115 for converting the signal into a baseband signal and connecting it to the control unit 113, a speaker 116 for outputting various sound signals transmitted by the control unit 113 to the outside, a user voice and various sound signals A microphone 117 for inputting a color, a black and white conversion unit 118 for converting a color image transmitted by the control unit 113 into a black and white image, and transmitting the converted color image to the control unit 113, and a black and white transmission transmitted by the control unit 113. An outline extractor 119 is provided to extract the outline of the image.

On the keypad 110, keys for inputting numbers, symbols, characters, etc., keys for selecting various menus and executing various functions are arranged, and these keys generate a key signal when the user presses the control unit 113. To pass). Accordingly, the user inputs a command for implementing the present invention, that is, a password and a lock command for setting a lock, a photographing command, a command for user authentication, and the like through the keypad 110.

The memory 111 stores text and image information transmitted by the control unit 113, in particular, stores outline information of palmistry extracted from the palmistry image of the user photographed by the camera 112, and stores a password for setting a lock. Save it. In addition, the memory 111 stores an execution program for providing a call and various additional services, an authentication program for user authentication, a lock program for setting a lock, an image conversion program for converting a color image into a black and white image, and a black and white image. An outline extracting program for extracting outlines from the palm-derived image is converted into.

The camera 112 captures a palm image of the user under the control of the controller 113 and transmits the image to the controller 113. In this case, it is preferable to use the macro function of the camera 112 to capture the palm image more accurately. will be.

The control unit 113 controls the lock setting and the user authentication according to the user's instruction input through the keypad 110. This will be described in more detail as follows.

When a user inputs a password using a key on the keypad 110 and instructs a lock setting, the control unit 113 reads and executes a lock program stored in the memory 111 and executes the lock program of the mobile communication terminal 100 according to the program. Set the lock.

When the user instructs the storage of the palm image to be used for user authentication using the key, the controller 113 captures the palm image of the user through the camera 112 and transfers the captured color image to the monochrome conversion unit 118. At this time, the control unit 113 reads out an image conversion program stored in the memory 111 and executes the black and white conversion unit 118. The black and white conversion unit 118 converts the color palm image to a black and white image according to the program. Transfer to the control unit 113.

In addition, the controller 113 transmits the black and white palm rest image to the outline extracting unit 119, reads the outline extracting program stored in the memory 111, and executes the outline extracting unit 119. Accordingly, the outline extractor 119 extracts the outline image of the palmistry from the black and white palmistry image as shown in FIG. 2A. In detail, the outline extractor 119 is formed of a plurality of pixels. After comparing the chromaticity differences between adjacent pixels in the black and white palm image, the chromaticity difference is compared with the magnitude of a predetermined reference chromaticity. If the compared chromaticity difference is smaller than the predetermined reference chromaticity, the outline extracting unit 119 recognizes this as white and displays white between the adjacent adjacent pixels, and if the compared chromaticity difference is larger than the predetermined reference chromaticity, The outline extracting unit 119 recognizes this as black and displays the comparison between adjacent pixels in black. By displaying the pixel portion compared with the chromaticity difference between adjacent pixels among the plurality of pixels constituting the palm rest image in white or black, the outline extracting unit 119 is as shown in FIG. It will extract the outline information of the same palm image. In other words, the portion indicated by the black line in Figure 2b is the outline of the palm image to be extracted in the present invention.

When all the outline information of the palmistry image is extracted in this manner, the outline extracting unit 119 transfers the extracted outline information of the palmistry to the control unit 113, and then the control unit 113 stores the outline information of the palmage in memory ( 111 to be used for user authentication.

When the user inputs an unlock command using a key, the control unit 113 drives the camera 112 to capture the user's palm image, and when the user's palm image is captured through the camera 112, the outline extraction is performed. The unit 119 extracts the outline of the palmistry image and transmits the outline to the control unit 113 through the above-described process. The controller 113 compares the extracted palm line information with the palm line information stored in the memory 111 to determine whether the palm line is identical. If the result of the determination matches the outline information, the controller 113 releases the lock of the mobile communication terminal 100. If the result of the determination does not match the outline information, the controller 113 maintains the locked state and not the user. Alert through the screen 114 and / or speaker 116.

When the mobile communication terminal having the configuration and function as described above is described in detail with respect to the process of authenticating the user through the palm image of the user photographed by the camera.

3 is a flowchart illustrating a user authentication method of a mobile communication terminal according to an embodiment of the present invention, which illustrates a process of authenticating a user through a palm image of a user photographed through a camera.

Referring to FIG. 3, first, when a user inputs a command for storing his palm image as authentication information using a key, the mobile communication terminal sets an authentication information input mode (S301) and through the camera 112. The outline information of the palmistry is extracted from the palm image of the user to be photographed and stored in the memory 111 (S302).

In the process of extracting the outline information (S302), the mobile communication terminal captures the user's palm image through the camera 112, converts the photographed color image into a black and white image, and then extracts the palm line outline information from the black and white palm image. Save the outline information of extracted palmistry.

In this state in which the user authentication information is stored, the user sets and cancels the lock function of the mobile communication terminal as follows.

When the user instructs the lock setting using the key, the mobile communication terminal sets the lock (S303). In the setting process (S303), the user may set the lock of the mobile communication terminal using a password or the like. For example, Korean Patent Application No. 2001-0078063 proposes a technique for setting a lock by a mobile communication terminal when a secret code is received as a single message, and a user may initiate a lock function using this technique. have.

In the state that the lock function is set, when the user instructs to release the lock using the key, the mobile communication terminal sets the lock release mode (S304), and then captures the user's palm image through the camera 112, A palm image is converted into a black and white image as shown in FIG. 2A (S305).

Subsequently, the mobile communication terminal extracts the outline information of the palmistry as shown in FIG. 2B from the black and white palmistry image (S306). In the extraction process (S306), the mobile communication terminal compares the chromaticity difference between adjacent pixels in the black and white palmistry image composed of a plurality of pixels, and then compares the chromaticity difference and the magnitude of the predetermined reference chromaticity. As a result of the comparison, if the compared chromaticity difference is smaller than the predetermined reference chromaticity, it is recognized as white and displayed as white between the compared adjacent pixels, and if the comparison chromaticity difference is larger than the predetermined reference chromaticity, it is recognized as black. Black between the compared adjacent pixels.

After the outline information of the palm rest is extracted, the mobile communication terminal compares the extracted palm line information with the outline information of the palm rest stored in the memory 111 and determines whether the palm rest is identical (S307). If the communication terminal releases the lock (S308), and the determination result does not match the outline information, the communication terminal keeps the lock state and warns with a text and / or voice that the user is not (S309).

In the warning process (S309), the mobile communication terminal can display a warning message, for example, "cannot be used due to inconsistency of the palm", etc. via the LCD screen 114, the mobile communication terminal is also a speaker 116 ), A warning sound, for example, a "beep" sound or the like, or a voice message, for example, "cannot be used due to inconsistency of the palm" or the like. Here, the mobile communication terminal may output the warning text message and the warning sound at the same time or only one of them.

4 is a block diagram of a mobile communication terminal for user authentication according to another embodiment of the present invention.

Referring to FIG. 4, the mobile communication terminal 200 includes a keypad 200, a keypad 210, a memory 211, a camera 212, a controller 213, a liquid crystal display (LCD) 214, and a radio frequency processor ( 215, a speaker 216, a microphone 217, a monochrome conversion unit 218, and an outline extraction unit 219, where a keypad 210, a camera 212, and an LCD 214 are provided. The RF processor 215, the speaker 216, the microphone 217, and the like have the same function as described with reference to FIG. 1.

However, in order to perform user authentication by extracting outline information of a face image according to another exemplary embodiment of the present invention, the memory 211, the controller 213, the black and white converter 218, the outline extractor 219, and the like may be used. The following functions are added.

The memory 211 stores outline information of the face extracted from the face image of the user captured by the camera 212.

The camera 212 photographs a face image of the user under the control of the controller 213 and transmits the image to the controller 213. As described above, it may be desirable to use the macro function of the camera 212 to capture the face image more accurately.

When the user instructs to store the face image to be used for user authentication using the key, the controller 213 captures the face image of the user through the camera 212 and transmits the captured color image to the black and white converter 218. At this time, the black and white conversion unit 218 converts the color face image into a black and white image according to a predetermined image conversion program executed by the control unit 213 and transmits it to the control unit 213.

The controller 213 transfers the black and white face image to the outline extracting unit 219, reads the outline extracting program stored in the memory 211, and executes the outline extracting unit 219. Accordingly, the outline extractor 219 extracts the outline image of the face from the black and white face image as shown in FIG. 5A. In detail, the outline extractor 219 includes a plurality of pixels. After comparing chromaticity differences between adjacent pixels in a black and white face image, the chromaticity difference is compared with the magnitude of a predetermined reference chromaticity. If the compared chromaticity difference is smaller than the predetermined reference chromaticity, the outline extracting unit 219 recognizes it as white and displays white between the adjacent adjacent pixels, and if the comparison chromaticity difference is larger than the predetermined reference chromaticity, The outline extracting unit 219 recognizes this as black and displays the comparison between adjacent pixels in black. By displaying the pixel portion compared in accordance with the chromaticity difference between adjacent pixels among the plurality of pixels constituting the face image in white or black, the outline extractor 219 is shown in FIG. 5B in the face image as shown in FIG. 5A. The outline information of the same face image is extracted. That is, the portion indicated by black lines in FIG. 5B is an outline of a face image to be extracted in the present invention.

When all the outline information of the face image is extracted in this manner, the outline extracting unit 219 transfers the extracted outline information of the face to the control unit 213, and then the control unit 213 stores the outline information of the face in memory ( 211) to use for user authentication.

When the user inputs an unlock command using a key, the controller 213 drives the camera 212 to capture a face image of the user. When the face image of the user is captured through the camera 212, the outline is extracted. The unit 219 extracts the outline of the face image and transmits it to the controller 213 through the above-described process. The controller 213 compares the extracted outline information of the face with the outline information of the face stored in the memory 211 and determines whether the extracted face outline information matches. If the result of the determination matches the outline information, the controller 213 releases the lock of the mobile communication terminal 200. If the result of the determination does not match the outline information, the controller 213 maintains the locked state and not the user. Alert through screen 214 and / or speaker 216.

The process of authenticating the user through the face image of the user captured by the camera by the mobile communication terminal having the above configuration and function will be described in detail as follows.

6 is a flowchart illustrating a user authentication method of a mobile communication terminal according to another embodiment of the present invention, which illustrates a process of authenticating a user through a face image of a user photographed through a camera. However, since the user authentication process described below is similar to that described with reference to FIG. 3, the overlapping process will be described schematically.

Referring to FIG. 6, first, the mobile communication terminal sets an authentication information input mode according to a user's instruction (S601), and extracts outline information of a face from a face image of a user photographed through a camera 212 to store a memory ( 211) (S602).

As described above, while the outline information of the face is stored as user authentication information, the user sets and releases the lock function of the mobile communication terminal as follows.

The mobile communication terminal sets the lock according to the lock command of the user (S603). In this case, the lock setting method is the same as described above.

After the lock function is set, the mobile communication terminal sets the lock release mode according to the unlock command of the user (S604), and then captures the face image of the user through the camera 212 and shows the face image of the captured color. A black and white image as shown in 5a is converted (S605).

Subsequently, the mobile communication terminal extracts outline information of the face as shown in FIG. 5B from the black and white face image (S606). In the extraction process (S606), the mobile communication terminal compares chromaticity differences between adjacent pixels in a black and white face image composed of a plurality of pixels, and then compares the chromaticity difference compared with a predetermined reference chromaticity. As a result of the comparison, if the compared chromaticity difference is smaller than the predetermined reference chromaticity, it is recognized as white and displayed as white between the compared adjacent pixels, and if the comparison chromaticity difference is larger than the predetermined reference chromaticity, it is recognized as black. Black between the compared adjacent pixels.

After the outline information of the face is extracted as described above, the mobile communication terminal compares the extracted outline information of the face with the outline information of the face stored in the memory 211 to determine whether it matches (S607). If the communication terminal releases the lock (S608), and the determination result does not match the outline information, the communication terminal maintains the lock state and warns that the user is not a text (or voice) (S609). Here, the passing method is the same as described above.

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

As described above, the present invention, by using the built-in camera to capture the user's palm or face and authenticate the user using the captured palm or face image, thereby increasing the utilization of the built-in camera, unlike the case using the fingerprint recognition technology Since it is not necessary to separately provide an expensive device such as a fingerprint sensor in the mobile communication terminal, it is possible to increase the merchandise of the product.

Claims (16)

According to a control command input through a keypad, a mobile communication terminal for capturing an image with a built-in camera and setting and canceling a lock function, A storage unit for storing outline information of the body extracted from the body image of the user photographed by the camera; A black and white conversion unit for converting the body image of the color photographed by the camera into a black and white image; An outline extracting unit for extracting outline information of the body from the black and white body image converted by the black and white converter; And And controlling the black and white conversion unit to change the body image of the color photographed by the camera into a black and white image, and controlling the outline extraction unit to extract the outline information of the body from the black and white body image converted by the black and white conversion unit. And a controller for controlling the release of the lock according to whether the outline information of the body extracted by the outline extracting unit is the same as the outline information of the body stored in the storage unit and comparing the same. Mobile communication terminal comprising a. The method of claim 1, The storage unit is a mobile communication terminal, characterized in that for storing the outline information of the palmistry extracted from the palmistry image of the user taken by the camera. The method of claim 1, The storage unit stores the outline information of the face extracted from the face image of the user taken by the camera. The method of claim 2, Under the control of the controller, the black and white conversion unit converts the palm image of the color photographed by the camera to a black and white image and transmits it to the controller, Under the control of the controller, the outline extracting unit extracts the outline information of the palmistry from the black and white palmistry image inputted by the controller, and transmits the outline information of the palmistry extracted to the controller. The method of claim 3, wherein Under the control of the controller, the black and white conversion unit converts the face image of the color photographed by the camera to a black and white image and transmits it to the controller, Under the control of the controller, the outline extracting unit extracts the outline information of the face from the black and white face image input by the controller, and transfers the outline information of the face to the controller. The method of claim 4, wherein The control unit releases the lock when the outline information of the palmistry extracted by the outline extracting unit and the outline information of the palmistry stored in the storage unit are the same, and the outline information of the palmistry extracted by the outline extracting unit and the storage unit. The mobile communication terminal, characterized in that to maintain the locked state if the outline information of the stored palmistry is not the same. The method of claim 5, The controller releases the lock if the outline information of the face extracted by the outline extracting unit and the outline information of the face stored in the storage unit are the same, and extracts the outline information of the face extracted by the outline extracting unit and the storage unit. The mobile communication terminal, characterized in that to maintain the locked state if the outline information of the stored face is not the same. According to a control command input through a keypad, the mobile communication terminal captures an image with a built-in camera, and in the method of setting and canceling the lock function, A first step of extracting and storing outline information of a body from a body image of a user photographed through the camera after setting an authentication information input mode according to the authentication information input command; Setting a lock according to the lock command; A third step of capturing a body image of the user through the camera and extracting outline information of the body from the captured body image when the lock release command is input in the set lock state; And A fourth step of releasing the set lock if the stored body outline information and the extracted body outline information are the same and if the comparison result is the same. User authentication method of a mobile communication terminal comprising a. The method of claim 8, In the first step, the mobile communication terminal is a user authentication method of the mobile communication terminal, characterized in that to take the user's palm image by the camera and to extract and store the outline information of the palm tree from the user's palm image. The method of claim 8, The method of claim 1, wherein the mobile communication terminal captures a face image of the user through the camera and extracts and stores outline information of the face from the captured face image of the user. The method of claim 9, The third step, Step 3-1 of taking a palm image of the user through the camera; Step 3-2 of converting the palm-colored image of the photographed color into a black and white image; And Step 3-3 extracting the outline information of the palmistry from the converted black and white palmage image User authentication method of a mobile communication terminal comprising a. The method of claim 11, In step 3-3, the mobile communication terminal compares the chromaticity difference between adjacent pixels in a black and white palm rest image composed of a plurality of pixels, and then compares the compared chromaticity difference with a predetermined reference chromaticity size. As a result, when the compared chromaticity difference is smaller than a predetermined reference chromaticity, the pixels are recognized as white and displayed as white between the compared adjacent pixels. As a result of the comparison, the compared neighboring pixels recognized as black when the compared chromaticity difference is larger than the predetermined reference chromaticity. User authentication method of a mobile communication terminal, characterized in that the display in black. The method of claim 10, The third step, Step 3-1 of taking a face image of the user through the camera; Step 3-2 of converting the photographed color face image into a black and white image; And Step 3-3 extracting the outline information of the face from the converted black and white face image User authentication method of a mobile communication terminal comprising a. The method of claim 13, In step 3-3, the mobile communication terminal compares the chromaticity difference between adjacent pixels in a black and white face image composed of a plurality of pixels, and then compares the compared chromaticity difference with a predetermined reference chromaticity size. As a result, when the compared chromaticity difference is smaller than a predetermined reference chromaticity, the pixels are recognized as white and displayed as white between the compared adjacent pixels. As a result of the comparison, the compared neighboring pixels recognized as black when the compared chromaticity difference is larger than the predetermined reference chromaticity. User authentication method of a mobile communication terminal, characterized in that the display in black. The method of claim 12, In the fourth step, comparing the stored outline information of the palmistry and the extracted outline information of the palmistry is the same as the comparison result, the set lock is released, if not equal to the comparison result, the lock state is maintained User authentication method of the mobile communication terminal. The method of claim 14, In the fourth step, comparing the stored outline information of the face and the extracted outline information of the face is the same, if the comparison result is the set lock is released, if not the comparison result is characterized in that the lock state is maintained User authentication method of the mobile communication terminal.

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