JP2013134565A - Individual authentication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an individual authentication device which is easy for a user to use.SOLUTION: The individual authentication device includes: display means for displaying a prescribed image for authentication on a display screen; detection means for detecting a moving track of a contact position with one point as a starting point and coordinates of at least two points on the track, when the contact state is canceled after the contact position is changed along contents of the image for the authentication while maintaining the contact state; and authentication means for performing individual authentication of a user by determining whether or not the moving track and the coordinates of the two points detected by the detection means coincide with a prescribed track and coordinates respectively.

Description

  The present invention relates to a personal authentication device.

  In an information device such as a personal computer, a smartphone, or a mobile phone, personal authentication of a user is performed by inputting a password or the like. For example, Patent Document 1 describes a technique for performing authentication using repeated information of an input position and a locus.

JP 2009-2111436 A

  The invention described in Patent Document 1 has a problem that it is difficult for the user to use because it is necessary to remember the number of times the trajectory is repeated and the input start position changes at every authentication.

  According to the first aspect of the present invention, there is provided display means for displaying a predetermined authentication image on the display screen, and the user touches one point on the display screen and touches along the contents of the authentication image while maintaining the contact state. When the contact state is released after the position is changed, the detection means for detecting the movement locus of the contact position starting from one point and the coordinates of at least two points on the locus, the movement locus detected by the detection means, and 2 An individual authentication apparatus comprising: an authenticating unit that performs individual authentication of a user by determining whether or not the coordinates of a point respectively coincide with a predetermined locus and coordinates.

  According to the present invention, it is possible to provide a personal authentication device that is easy for a user to use.

1 is a perspective view showing an appearance of a digital camera 1 according to a first embodiment of the present invention. 1 is a block diagram showing a configuration of a digital camera 1 according to a first embodiment of the present invention. It is a figure which shows typically the registration procedure of authentication information. It is a figure which shows the detail of authentication information. It is a flowchart of a registration process of authentication information. It is a flowchart of a personal authentication process. It is a flowchart of a registration process of authentication information. It is a flowchart of a personal authentication process.

  Hereinafter, an embodiment will be described using a digital camera provided with a personal authentication device according to the present invention as an example.

(First embodiment)
FIG. 1 is a perspective view showing an appearance of a digital camera 1 according to the first embodiment of the present invention. A liquid crystal panel 11 that displays a captured image and a setting screen is provided on the rear surface of the digital camera 1. For example, a capacitive touch panel 12 is laminated on the surface of the liquid crystal panel 11. A user can perform various operations of the digital camera 1 by bringing a finger or the like into contact with the liquid crystal panel 11.

  A power switch 13 and a release switch 14 are provided on the upper surface of the casing of the digital camera 1. Further, an operation member 15 for performing various operations is provided on the rear surface of the housing of the digital camera 1. The user can also operate the digital camera 1 by using these operation members 15 in addition to the touch panel 12.

  FIG. 2 is a block diagram showing the configuration of the digital camera 1 according to the first embodiment of the present invention. An imaging optical system 21 that forms a subject image is provided on the front surface of the housing of the digital camera 1 (the surface opposite to the surface on which the liquid crystal panel 11 is provided). An imaging element 22 such as a CCD or a CMOS is provided in the vicinity of the planned focal plane of the imaging optical system 21. The image sensor 22 captures a subject image formed on the imaging surface and outputs a photoelectric conversion signal (imaging signal) corresponding to the brightness of the subject image to the control circuit 23. R (red), G (green), and B (blue) color filters are respectively provided on the imaging surface of the imaging element 22 so as to correspond to the pixel positions.

  The control circuit 23 includes a microprocessor and its peripheral circuits, and controls each unit of the digital camera 1 by executing a predetermined control program stored in a flash memory 27 that is an auxiliary storage device. The control circuit 23 performs various image processing on the image pickup signal output from the image pickup device 22 to generate image data, and temporarily stores it in the DRAM 26 which is a main storage device. The control circuit 23 stores the generated image data in, for example, a memory card 24 that is a portable storage medium or displays it on the liquid crystal panel 11.

  The operation unit 25 connected to the control circuit 23 includes the power switch 13, the release switch 14, the operation member 15, and the like illustrated in FIG. 1, and in response to the operation of these units by the user, A corresponding operation signal is output to the control circuit 23. The control circuit 23 performs various processes according to the input operation signal, for example, taking a subject image in response to an operation signal corresponding to the release switch 14 being input.

  The digital camera 1 according to the present embodiment has a security function that performs personal authentication of a user when shooting a still image, and prevents a still image from being shot unless the user is authenticated. Hereinafter, this security function will be described in detail.

  In order to use the security function in the digital camera 1, the user needs to register authentication information in advance. The authentication information in the present invention is information input by the user in order to prove that he is a specific individual registered in advance. The authentication information of the present embodiment is not a password that is commonly used, but is a movement locus of a finger or the like input by the touch panel 12 along the content of the authentication image.

  FIG. 3 is a diagram schematically showing a registration procedure of authentication information. For example, when the digital camera 1 starts an authentication information registration process by selecting an item “registration information registration” from the menu screen, a screen 40 shown in FIG. 3A is displayed on the liquid crystal panel 11. Is done. The screen 40 includes an authentication image 41 and a determination button 42 displayed superimposed on the authentication image 41.

  The authentication image 41 is an image stored in the flash memory 27 in advance. In the authentication information registration process, the control circuit 23 reads the authentication image 41 from the flash memory 27 and displays it on the liquid crystal panel 11. The user touches the touch panel 12 with a point such as a finger, and moves the finger or the like along the contents of the authentication image 41 displayed on the liquid crystal panel 11 while maintaining the contact state. An example is shown in FIGS. 3B to 3D.

  FIG. 3B shows a state in which the user touches the finger 43 with the node 44, and FIG. 3C shows that the user keeps the finger 43 in contact with the touch panel 12 while keeping the finger 43 in contact with the touch panel 12. FIG. 3D further shows the state in which 43 is moved to the node 46 in the direction indicated by the arrow 45 (downward) along the edge of the authentication image 41 in FIG. After moving to, the state of moving to the node 50 in the direction of the arrow 49 (upward) is shown. When the user moves the contact position while maintaining the contact state as shown in FIGS. 3B to 3D, the control circuit 23 displays the movement locus 51 of the contact position superimposed on the authentication image 41. Drawing is performed as shown in 3 (b) to FIG. 3 (d). The drawn movement trajectory 51 continues to be displayed on the liquid crystal panel 11 even after the user releases the contact state, as shown in FIG.

  The user looks at the screen 40 in FIG. 3E and confirms whether or not the movement locus 51 is as desired. If the movement locus 51 is different from the intended one, the operations shown in FIGS. 3B to 3E are performed again until the intended movement locus 51 is drawn on the screen 40. repeat. When the control circuit 23 comes into contact with the touch panel 12 again in the state shown in FIG. 3E, the control circuit 23 erases the moving track 51 at that time and starts inputting the moving track 51 from the beginning. That is, the state returns to the state of FIG.

  When the intended movement locus 51 is drawn on the screen 40, as shown in FIG. 3F, the user presses the decision button 42 with the finger 43 or the like. When the determination button 42 is pressed, the control circuit 23 stores the input information of the movement locus 51 in the flash memory 27 as authentication information.

  FIG. 4 is a diagram showing details of the authentication information. In FIG. 4, the content of the authentication image 41 is indicated by a broken line, and the nodes 44, 46, 48, and 50 constituting the authentication information and a plurality of straight lines 51, 52, and 53 that connect the nodes are indicated by a solid line. In addition, two integer pairs written in the vicinity of each node represent the coordinates of the node in the coordinate system with the lower left corner of the authentication image 41 as the origin.

  When the user inputs a movement trajectory 51 as shown in FIG. 3, the control circuit 23 of the present embodiment coordinates the nodes 44, 46, 48, and 50 shown in FIG. 4 and the next node from each node. The angles formed by the straight lines are stored in the flash memory 27 as authentication information. In the present embodiment, the movement trajectory 51 is composed of a plurality of nodes and straight lines connecting the nodes. Therefore, if the coordinates of each node and the angle of the straight line between each node are stored, the original movement trajectory 51 can be restored.

  When the authentication information is stored in the flash memory 27, the control circuit 23 performs personal authentication of the user when the user uses the still image shooting function, and whether or not the user is a specific user. Determine whether. Hereinafter, this determination procedure will be described.

  For example, when the user instructs the digital camera 1 to use the still image shooting function by operating the operation member 15 or the like, the control circuit 23 displays the authentication image 41 on the liquid crystal panel 11 as in FIG. To do. The user inputs the movement trajectory 51 as in FIGS. 3B to 3E, and presses the enter button 42 as in FIG. 3F. The control circuit 23 compares the input movement locus 51 with the authentication information stored in the flash memory 27 in response to pressing of the determination button 42. If they match, it is determined that the user is the “specific user” described above, and the personal authentication is successful. In this case, the control circuit 23 permits the use of the still image shooting function. On the other hand, if the input movement locus 51 does not match the authentication information, the personal authentication fails and the control circuit 23 does not allow the user to use the still image shooting function.

  In addition, in order to hide what movement locus 51 the user has input, the movement locus 51 may not be displayed on the liquid crystal panel 11 during personal authentication. The same applies to the registration of authentication information.

  FIG. 5 is a flowchart of authentication information registration processing. First, in step S <b> 100, the control circuit 23 reads a predetermined authentication image 41 from the flash memory 27 and displays it on the liquid crystal panel 11. In step S <b> 110, the control circuit 23 determines whether the user has touched one point on the touch panel 12. The control circuit 23 repeats Step S110 until the touch panel 12 is in a contact state (the user touches one point on the touch panel 12), and when the touch circuit 12 is in a contact state, the process proceeds to Step S120.

  In step S 120, the control circuit 23 stores the output (current contact position) of the touch panel 12 in the DRAM 26. That is, the movement locus 51 of the contact position of the touch panel 12 is stored by sequentially storing the contact position of the touch panel 12. In step S130, the control circuit 23 determines whether or not the touch state of the touch panel 12 has been released. If the contact state of the touch panel 12 is released, such as when the user removes his / her finger from the touch panel 12, the process proceeds to step S140. On the other hand, when the touch panel 12 continues to be in a contact state, the process returns to step S120 and the movement locus 51 is continuously stored. In step S150, as shown in FIG. 4, the control circuit 23 stores the coordinates of the nodes constituting the movement locus 51 and the angle of the straight line between the nodes in the flash memory 27 as authentication information.

  FIG. 6 is a flowchart of the personal authentication process. The processing from step S200 to step S240 is the same as that from step S100 to step S140 of the authentication information registration processing shown in FIG. That is, the control circuit 23 displays the authentication image 41 on the liquid crystal panel 11 and stores the movement locus 51 input from the touch panel 12 by the user in the DRAM 26. When the user presses the enter button 42, the process proceeds to step S250. In step S250, the control circuit 23 determines whether or not the movement locus 51 stored in the DRAM 26 matches the authentication information stored in the flash memory 27. If they do not match, that is, if the personal authentication has failed, the process returns to step S210 and accepts the input of the movement locus 51 again from the user. On the other hand, if the input movement trajectory 51 matches the authentication information, that is, if the personal authentication is successful, the processing of FIG. 6 is terminated, and the control circuit 23 permits the user to use the still image shooting function. To do.

According to the digital camera 1 according to the first embodiment described above, the following operational effects can be obtained.
(1) The control circuit 23 displays a predetermined authentication image 41 on the liquid crystal panel 11, and the user touches one point of the liquid crystal panel 11 and keeps the contact state along the contents of the authentication image 41. When the contact state is released after the position is changed, it is determined whether or not the movement locus 51 of the contact position starting from that one point detected by the touch panel 12 matches the predetermined locus. Perform personal authentication. Since it did in this way, the personal authentication apparatus which is easy to use for the user using the authentication information called the movement locus which is easier to remember and input than the password can be provided.

(2) When the user touches one point of the liquid crystal panel 11 and changes the contact position along the edge of the authentication image 41 while maintaining the contact state, the control circuit 23 cancels the contact state. Personal authentication is performed using the movement locus of the contact position starting from that one point detected by the touch panel 12. Since it did in this way, the user can input the movement locus | trajectory 51 easily.

(Second Embodiment)
The digital camera according to the second embodiment to which the present invention is applied has the same configuration as the digital camera according to the first embodiment, but differs from the first embodiment in that there are a plurality of authentication images. . The authentication information registration process and personal authentication process in the second embodiment will be described below. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted.

  Unlike the first embodiment, the flash memory 27 of the present embodiment stores a plurality of authentication images. When registering the authentication information, the user selects one of the plurality of authentication images and inputs the movement locus 51. At the time of personal authentication, the control circuit 23 presents the plurality of authentication images and allows the user to select one of them. Further, not only the movement trajectory 51 but also a case where the selected authentication image does not coincide with the registration time of the authentication information is regarded as an authentication failure. In other words, in the present embodiment, the authentication information includes information for specifying any one of the plurality of authentication images (for example, a number assigned to each of the plurality of authentication images).

  Note that any method for selecting a plurality of authentication images may be used. For example, a plurality of authentication images may be displayed as a list in thumbnail format, and the user may select one of them. In addition, each authentication image is displayed on the entire display area of the liquid crystal panel 11 so that the user can switch the authentication images displayed one after another by a slide operation on the touch panel 12 or the like. An authentication image determination button may be pressed when an image is displayed. Furthermore, the display order of the plurality of authentication images may be changed every time authentication is performed.

  FIG. 7 is a flowchart of authentication information registration processing by the control circuit 23 according to the second embodiment. First, in step S300, the control circuit 23 receives a selection input of the authentication image 41 by the user from the touch panel 12 or the operation unit 25. In step S310, the control circuit 23 displays the authentication image 41 selected in step S400 on the liquid crystal panel 11. The processing from step S320 to step S350 is the same as the processing from step S110 to step S140 in FIG. In step S360, the control circuit 23 stores the information for specifying the authentication image 41 selected in step S300 and the movement locus 51 stored in the DRAM 26 in the flash memory 27 as authentication information.

  FIG. 8 is a flowchart of personal authentication processing by the control circuit 23 according to the second embodiment. First, in step S <b> 400, the control circuit 23 receives a selection input of the authentication image 41 by the user from the touch panel 12 or the operation unit 25. In step S410, the control circuit 23 displays the authentication image 41 selected in step S400 on the liquid crystal panel 11. The processing from step S420 to step S450 is the same as the processing from step S310 to step S350 in FIG. In step S460, the control circuit 23 determines whether or not the authentication image 41 selected in step S400 and the movement trajectory 51 stored in the DRAM 26 match the authentication information stored in the flash memory 27. If they do not match, that is, if the personal authentication has failed, the process returns to step S420 and accepts the input of the movement locus 51 again from the user. On the other hand, if the selected authentication image 41 and the input movement trajectory 51 coincide with the authentication information, that is, if the personal authentication is successful, the processing of FIG. Allow use of the shooting function.

According to the digital camera 1 according to the second embodiment described above, the following operational effects can be obtained.
(1) The control circuit 23 displays the authentication image 41 selected by the user among the plurality of authentication images stored in the flash memory 27 on the liquid crystal panel 11 and the authentication image selected by the user. It is determined whether or not the image 41 is a predetermined authentication image specified by the authentication information, and the coordinates of each node constituting the movement locus 51 detected by the touch panel 12 coincide with the movement locus included in the authentication information. By doing so, the user's personal authentication is performed. Since it did in this way, stronger security can be realized.

  The following modifications are also within the scope of the present invention, and one or a plurality of modifications can be combined with the above-described embodiment.

(Modification 1)
The comparison of the movement trajectories 51 does not necessarily have to be performed strictly. For example, in FIG. 4, the coordinates of the node 44 are (90, 278), but if the starting point of the movement trajectory 51 input at the time of personal authentication is not completely the same as this, the authentication is not failed, but (90 , 278) may be regarded as coincident if included in a circle of radius 5 centered (at least for this node 44). The same applies to the angle of the straight line between the nodes.

  Even when the starting point of the movement trajectory 51 input at the time of personal authentication is at a position away from the node 44, the starting point exists on the straight line 51 between the node 44 and the node 46, and the node from the starting point exists. If the angle formed by the straight line from the node 46 to the node 46 stored in the flash memory 27 is the same as the angle formed from the straight line from the node 44 to the node 46, it may be regarded that they coincide (at least from the node 44 to the node 46). . The same applies to the end point. In other words, for the movement trajectory, the position of each node excluding the start point and end point among the plurality of nodes is the position input at the time of registration of authentication information, and from the start point to the next node and from the end point to the previous node It may be determined that the personal authentication is successful when the straight line matches the angle input when registering the authentication information.

  Further, the storage form of the movement locus 51 and the comparison method are not limited to those described above. For example, the movement trajectory 51 may include a curve, or may not be limited to a straight line connecting the nodes, but may be stored pixel by pixel and a complete comparison may be performed.

(Modification 2)
The authentication image is not stored in the flash memory 27 in advance, but a photographed image taken by the user stored in the memory card 24 may be used as the authentication image. Similarly, when there are a plurality of authentication images as in the second embodiment, a plurality of captured images stored in the memory card 24 are used as a plurality of authentication images. Good. In such a case, the photographed image as the authentication image may be copied to the flash memory 27, or the photographed image stored in the memory card 24 may be directly used as the authentication image. Also good.

(Modification 3)
The determination button 42 is not necessarily required at the time of registration of authentication information or personal authentication. For example, the movement trajectory 51 may be stored as authentication information when the contact state with the touch panel 12 is released, or the movement trajectory 51 and authentication information may be compared.

(Modification 4)
In each of the embodiments described above, the movement trajectory 51 is based on a so-called one-stroke trajectory. That is, the movement trajectory 51 until the contact state is released after the finger or the like is once in contact with the touch panel 12 is handled. The present invention is not limited to such a movement trajectory 51, and it is also possible to handle a movement trajectory 51 composed of a plurality of trajectories that are not continuous.

(Modification 5)
A plurality of authentication information (movement trajectory 51) may be stored for one authentication image. In this case, the control circuit 23 can assign different authorities to the respective movement trajectories 51. For example, when two types of movement trajectories 51 are registered, if the first movement trajectory is input, the use of the first function is permitted, and if the second movement trajectory is input, The control circuit 23 can be configured to permit the use of the second function. It is also possible to store a separate movement locus 51 for each of a plurality of authentication images.

(Modification 6)
When the control circuit 23 displays the authentication image 41, the authentication image 41 may be displayed after performing image processing such as known edge enhancement processing or edge extraction processing. When the control circuit 23 executes such processing, the user can easily input the movement locus 51 along the edge of the authentication image 41.

(Modification 7)
The present invention is not only applied to a digital camera as in the above-described embodiments, but can be applied to various other devices. For example, the present invention can also be applied to portable electronic devices such as mobile phones and electronic notebooks equipped with touch panels, stationary communication terminals such as automatic cash dispensers and so-called kiosk terminals. In addition, the object protected by personal authentication is not limited to the availability of a specific function such as the use of the still image shooting function described above. For example, the present invention can also be applied to control of access authority to predetermined data (such as a photographed image) and personalization of function settings.

  As long as the characteristics of the present invention are not impaired, the present invention is not limited to the above-described embodiments, and other forms conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention. .

DESCRIPTION OF SYMBOLS 1 ... Digital camera, 11 ... Liquid crystal panel, 12 ... Touch panel, 13 ... Power switch, 14 ... Release switch, 15 ... Operation member, 21 ... Imaging optical system, 22 ... Imaging element, 23 ... Control circuit, 24 ... Memory card , 25 ... operation unit, 26 ... DRAM, 27 ... flash memory

Claims (5)

Display means for displaying a predetermined authentication image on the display screen;
When the user touches one point on the display screen and changes the contact position along the contents of the authentication image while maintaining the contact state, the contact state is released from the one point. Detecting means for detecting a position movement locus and coordinates of at least two points on the locus;
Authentication means for performing personal authentication of the user by determining whether or not the movement trajectory and the coordinates of the two points detected by the detection means coincide with a predetermined trajectory and coordinates, respectively;
A personal authentication device comprising: The personal authentication device according to claim 1,
The detection means is configured to detect the 1 when the user releases the contact state after touching one point on the display screen and changing the contact position along the edge of the authentication image while maintaining the contact state. A personal authentication device characterized by detecting a movement locus of a contact position starting from a point and coordinates of at least two points on the locus. In the personal authentication device according to claim 1 or 2,
The authentication means is configured such that, with respect to the movement trajectory composed of a plurality of nodes and a plurality of straight lines connecting the plurality of nodes, positions of the nodes excluding a start point and an end point of the plurality of nodes are predetermined positions, and When the straight line from the start point to the next node and the straight line from the end point to the previous node form a predetermined angle, the movement locus detected by the detection means and the coordinates of the two points are A personal authentication device, characterized in that it is determined that each of them matches a predetermined trajectory and coordinates. In the personal authentication device according to any one of claims 1 to 3,
Image storage means for storing a plurality of authentication images;
The display means displays an authentication image selected by the user among the plurality of authentication images stored in the image storage means on the display screen,
In the authentication unit, whether the authentication image selected by the user is a predetermined image, and the movement trajectory and the coordinates of the two points detected by the detection unit coincide with the predetermined trajectory and coordinates, respectively. A personal authentication apparatus that performs personal authentication of the user by determining whether or not. In the personal authentication device according to any one of claims 1 to 4,
A trajectory storage means for storing the predetermined trajectory and coordinates;
The authentication unit determines whether the movement trajectory and the coordinates of the two points detected by the detection unit coincide with the predetermined trajectory and coordinates read from the trajectory storage unit, respectively. A personal authentication device for performing personal authentication of a person.

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