Authentication system, authentication method, and recording medium

Abstract

This authentication system comprises: a photographing means capable of switching between normal photography and blur photography that involves photographing an image with less clarity than the normal photography; a target detection means that detects (S102) an authentication target on the basis of a blurred image acquired (S101) by the blur photography; a switching means that switches (S103) from the blur photography to the normal photography if the authentication target is detected; and an authentication means that executes processing for authenticating (S105) the authentication target on the basis of a normal image acquired (S104) by the normal photography.

Description

Technical Field

[0001] This disclosure relates to the technical field of authentication systems, authentication methods, and recording media.

Background Art

[0002] In a system for photographing a target image, a process of blurring the image may be executed in consideration of privacy. For example, Patent Document 1 discloses a technique of changing the degree of blurring according to the proximity of a person to be monitored. Patent Document 2 discloses a technique of performing a blurring process on a background area other than the main subject, but releasing the blurring process during the authentication process. Patent Document 3 discloses a technique of determining the blurring intensity based on the attributes of the detected person.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] This disclosure aims to improve the techniques disclosed in the prior art documents.

Means for Solving the Problems

[0005] One aspect of the authentication system of this disclosure includes imaging means capable of switching between normal imaging and blurred imaging performed in a state with lower sharpness than the normal imaging, target detection means for detecting an authentication target based on a blurred image obtained by the blurred imaging, switching means for switching from the blurred imaging to the normal imaging when the authentication target is detected, and authentication means for performing authentication processing of the authentication target based on a normal image obtained by the normal imaging.

[0006] One aspect of the authentication method of this disclosure is an authentication method using imaging means capable of switching between normal imaging and blurred imaging performed in a state with lower sharpness than the normal imaging. Based on a blurred image obtained by the blurred imaging, an authentication target is detected. When the authentication target is detected, a switch is made from the blurred imaging to the normal imaging, and authentication processing of the authentication target is performed based on a normal image obtained by the normal imaging.

[0007] One aspect of the recording medium of this disclosure is an authentication method using imaging means capable of switching between normal imaging and blurred imaging performed in a state with lower sharpness than the normal imaging. Based on a blurred image obtained by the blurred imaging, an authentication target is detected. When the authentication target is detected, a switch is made from the blurred imaging to the normal imaging, and authentication processing of the authentication target is performed based on a normal image obtained by the normal imaging. A computer program for causing at least one computer to execute the authentication method is recorded.

Brief Description of Drawings

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Embodiments for Carrying Out the Invention

[0009] Hereinafter, embodiments of the authentication system, the authentication method, and the recording medium will be described with reference to the drawings.

[0010] <First Embodiment> The authentication system according to the first embodiment will be described with reference to FIGS. 1 to 7.

[0011] (Hardware Configuration) First, with reference to FIG. 1, the hardware configuration of the authentication system according to the first embodiment will be described. FIG. 1 is a block diagram showing the hardware configuration of the authentication system according to the first embodiment.

[0012] As shown in FIG. 1, the authentication system 10 according to the first embodiment includes a processor 11, a RAM (Random Access Memory) 12, a ROM (Read Only Memory) 13, and a storage device 14. The authentication system 10 may further include an input device 15 and an output device 16. The above-described processor 11, RAM 12, ROM 13, storage device 14, input device 15, and output device 16 are connected via a data bus 17.

[0013] Processor 11 reads a computer program. For example, processor 11 is configured to read a computer program stored in at least one of RAM 12, ROM 13, and storage device 14. Alternatively, processor 11 may read a computer program stored in a computer-readable recording medium using a recording medium reader (not shown). Processor 11 may obtain (i.e., read) a computer program from a device (not shown) disposed outside authentication system 10 via a network interface. By executing the read computer program, processor 11 controls RAM 12, storage device 14, input device 15, and output device 16. In particular, in this embodiment, when the computer program read by processor 11 is executed, functional blocks for capturing an object and executing authentication processing are realized within processor 11. That is, processor 11 may function as a controller that executes each control in authentication system 10.

[0014] Processor 11 may be configured as, for example, a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), an FPGA (field-programmable gate array), a DSP (Demand-Side Platform), or an ASIC (Application Specific Integrated Circuit). Processor 11 may be configured of one of these, or may be configured to use a plurality in parallel.

[0015] RAM 12 temporarily stores the computer program executed by processor 11. RAM 12 temporarily stores data temporarily used by processor 11 when processor 11 is executing a computer program. RAM 12 may be, for example, a D-RAM (Dynamic Random Access Memory) or an SRAM (St atic Random Access Memory). Also, RAM1 Instead of 2, other types of volatile memory may be used.

[0016] The ROM 13 stores computer programs executed by the processor 11. The ROM 13 may also store other fixed data. The ROM 13 may be, for example, a P-ROM (Programmable Read Only Memory) or an EPROM (Erasable Read Only Memory). Also, instead of the ROM 13, other types of non-volatile memory may be used.

[0017] The storage device 14 stores data that the authentication system 10 stores in the long term. The storage device 14 may operate as a temporary storage device of the processor 11. The storage device 14 may include, for example, at least one of a hard disk device, a magneto-optical disk device, an SSD (Solid State Drive), and a disk array device.

[0018] The input device 15 is a device that receives input instructions from the user of the authentication system 10. The input device 15 may include, for example, at least one of a keyboard, a mouse, and a touch panel. The input device 15 may be configured as a portable terminal such as a smartphone or a tablet. The input device 15 may be a device capable of voice input including, for example, a microphone.

[0019] The output device 16 is a device that outputs information about the authentication system 10 to the outside. For example, the output device 16 may be a display device (e.g., a display) capable of displaying information about the authentication system 10. Also, the output device 16 may be a speaker or the like capable of voice output of information about the authentication system 10. The output device 16 may be configured as a portable terminal such as a smartphone or a tablet. Also, the output device 16 may be a device that outputs information in a form other than an image. For example, the output device 16 may be a speaker that outputs information about the authentication system 10 by voice.

[0020] The camera 18 is provided for photographing the authentication target of the authentication system 10. That is, the camera is configured to be able to photograph an image (for example, a face image of the target, etc.) used for the authentication process of the target. The type of the camera 18 is not particularly limited, and for example, it may be a visible light camera or a near-infrared camera. A more specific configuration example of the camera 18 will be described in detail later.

[0021] Note that among the hardware described in FIG. 1, some hardware may be provided in a device other than the authentication system 10. For example, the authentication system 10 may be configured to include only the above-described processor 11, RAM 12, and ROM 13, and for other components (that is, the storage device 14, the input device 15, and the output device 16), for example, an external device connected to the authentication system 10 may be provided with them. Also, the authentication system 10 may be such that some arithmetic functions are realized by an external device (for example, an external server or the cloud, etc.).

[0022] (Configuration example of the camera) Next, with reference to FIG. 2, a specific configuration example of the above-described camera 18 will be described. FIG. 2 is a block diagram showing the specific configuration of the camera included in the authentication system according to the first embodiment.

[0023] As shown in FIG. 2, the camera 18 according to the first embodiment may be configured to include, as its main components, a lens 21, a filter switching unit 22, an image sensor 23, an image processing unit 24, and an output unit 25. When imaging with the camera 18, the light incident on the lens 21 forms an image on the image sensor 23 through the filter switching unit 22 (accurately, the filter provided in the filter switching unit). Then, the image processing unit 24 executes various image processes on the output of the image sensor, and the image data is output by the output unit 25.

[0024] The above-described filter switching unit 22 includes a blur filter and a normal filter, and is configured to be able to switch the imaging mode by switching between them. Specifically, when the filter switching unit 22 switches to a state where the blur filter is used, the camera 18 performs blurred shooting (i.e., shooting in a blurred state with low sharpness). On the other hand, when the filter switching unit 22 switches to a state where the normal filter is used, the camera 18 performs normal shooting (i.e., shooting in a state without blurring with high sharpness). Note that the "blurred shooting" here may be shooting in a state with low sharpness to the extent that the privacy of the authentication target to be photographed is protected. The filter switching unit 22 may switch between normal shooting and blurred shooting by switching filters of different types as described above, or may switch between normal shooting and blurred shooting by electrically switching between a state where light is transmitted and a state where light is semi-transmitted using a filter composed of liquid crystal or the like.

[0025] The above-described configuration is merely an example, and the camera 18 may be configured with different elements. In particular, the camera 18 may be configured to be able to realize normal shooting and blurred shooting using elements different from the filter switching unit 22. That is, the configuration for enabling switching between normal shooting and blurred shooting is not limited to the configuration using a filter. For example, the camera 18 may perform normal shooting by shooting with the focus adjusted to the target, and may perform blurred shooting by intentionally defocusing the target. Alternatively, the camera 18 may perform normal shooting by adjusting the exposure and shutter speed to appropriate values, and may perform blurred shooting by intentionally deviating the exposure and shutter speed from the appropriate values. Alternatively, the camera 18 may perform blurred shooting by intentionally coarsening the image (for example, reducing the resolution).

[0026] (Functional Configuration) Next, with reference to FIG. 3, the functional configuration of the authentication system 10 according to the first embodiment will be described. FIG. 3 is a block diagram showing the functional configuration of the authentication system according to the first embodiment.

[0027] As shown in FIG. 3, the authentication system 10 according to the first embodiment includes a camera 18 and a processing unit 100. The processing unit 100 is configured to be able to execute various processes in the authentication system 10. The processing unit 100 includes an object detection unit 110, a switching unit 120, and an authentication unit 130 as components for realizing its functions. Note that each of the object detection unit 110, the switching unit 120, and the authentication unit 130 may be a functional block realized by, for example, the above-described processor 11 (see FIG. 1). Some or all of the functions of the above-described processing unit 100 may be implemented in the camera 18.

[0028] The object detection unit 110 is configured to be able to detect the presence of an authentication target (that is, a target for which an authentication process should be executed) based on a blurred image captured by blurred shooting. The specific detection method of the authentication target is not particularly limited. Specific examples of the detection method will be described in detail in other embodiments described later.

[0029] The switching unit 120 is configured to be able to switch blurred shooting to normal shooting when the authentication target is detected by the object detection unit 110. The switching unit 120 switches blurred shooting to normal shooting by controlling, for example, the filter switching unit 22 (see FIG. 2) described above.

[0030] After the blurred shooting is switched to normal shooting by the switching unit 120, the authentication unit 130 executes an authentication process of the authentication target based on a normal image obtained by normal shooting. The authentication process here is typically face authentication, but may be other authentication using an image (for example, iris authentication, etc.). Note that since existing technologies can be appropriately applied to the specific method of the authentication process, detailed description thereof is omitted here. The authentication unit 130 may have a function of outputting an authentication result. Further, the authentication unit 130 may be configured to be able to execute various controls (for example, opening and closing of a gate) according to the authentication result.

[0031] (Flow of operations) Next, with reference to FIG. 4, the operation flow of the authentication system 10 according to the first embodiment will be described. FIG. 4 is a flowchart showing the operation flow of the authentication system according to the first embodiment.

[0032] As shown in FIG. 4, when the operation by the authentication system 10 according to the first embodiment is started, first, the target detection unit 110 acquires a blurred image captured by blurred photography (step S101). Then, based on the acquired blurred image, the target detection unit 110 detects the presence of the authentication target (step S102). If the authentication target is not detected from the blurred image (step S102: NO), the process may start again from step S101.

[0033] On the other hand, when the authentication target is detected from the blurred image (step S102: YES), the switching unit 120 instructs the filter switching unit 22 to switch the filter, and switches the blurred photography to normal photography (step S103). Then, the authentication unit 130 acquires a normal image captured by normal photography (step S104). And the authentication unit 130 executes the authentication process of the authentication target based on the acquired normal image (step S105).

[0034] (Specific application examples) Next, with reference to FIGS. 5 to 7, specific application examples of the authentication system 10 according to the first embodiment will be described. FIG. 5 is a side view showing a specific application example by the authentication system according to the first embodiment. FIG. 6 is a plan view showing an example of a blurred image and a normal image captured by the authentication system according to the first embodiment. FIG. 7 is a flowchart showing an example of the authentication process flow by the authentication system according to the first embodiment.

[0035] As shown in FIG. 5, the authentication system 10 according to the first embodiment may be configured as a system that executes authentication processing at the walk-through gate. Here, the camera 18 is configured to be included in the face authentication terminal 200 installed at the gate 300. In this case, the camera 18 captures an image of the face of the authentication target 50 attempting to pass through the gate 300. Note that the image captured by the camera 18 is displayed on the monitor included in the face authentication terminal 200 facing the authentication target 50. The gate 300 is provided with a passage confirmation sensor 305 for confirming that the target 50 has passed through the gate 300. Further, data such as images acquired by the face authentication terminal 200 is configured to be output to the face authentication server storage 400.

[0036] As shown in FIG. 6, in the standby state (i.e., the state where the authentication process is not being executed), the camera 18 performs blurred imaging. The image captured by the blurred imaging is an image that can detect the presence of the authentication target, but the details such as the face of the target cannot be distinguished. In other words, the privacy of the target is protected. On the other hand, when the presence of the authentication target is detected and the authentication state (i.e., the state where the authentication process is being executed) is entered, as already described, the blurred imaging is switched to normal imaging. For this reason, the normal image captured by the camera 18 becomes a clear image (i.e., an image on which the authentication process can be executed). Hereinafter, a specific example of the authentication process (i.e., the process of step S105 in FIG. 4 described above) will be described.

[0037] As shown in FIG. 7, when the authentication process is started, the authentication unit 130 first determines whether the authentication target imaged in the normal image is a registered person (step S151). That is, it is determined whether the authentication target is registered as a user who may pass through the gate 300. If the authentication target is not a registered person (step S151: NO), after the image acquired for authentication (i.e., the normal image) is discarded (step S157), the series of operations may be terminated.

[0038] If the authentication target is a registered person (step S151: YES), the authentication unit 130 determines whether the authentication target has reached the unlocking position of the gate 300 (step S152). Note that whether the authentication target has reached the unlocking position may be determined based on, for example, the distance between the eyes of the authentication target in a normal image. If the authentication target has not reached the unlocking position of the gate 300 (step S152: NO), and a certain period of time has not elapsed since it was determined that the authentication target is a registered person (step S153: NO), it will be repeatedly determined whether the authentication target has reached the unlocking position. On the other hand, if a certain period of time has elapsed since it was determined that the authentication target is a registered person (step S153: YES), after the image acquired for authentication is discarded (step S157), a series of operations may be terminated.

[0039] If the authentication target has reached the unlocking position of the gate 300 (step S152: YES), the authentication unit 130 performs the unlocking process of the gate 300 (step S154). After that, when it is confirmed by the passage confirmation sensor 305 that the authentication target has passed through the gate 300 (step S155: YES), the authentication unit 130 performs the locking process of the gate 300 (step S156). If, notwithstanding the unlocking process, the authentication target does not pass through the gate 300 (step S155: NO), the authentication unit 130 determines, for example, that the authentication target has turned back midway, discards the image acquired for authentication (step S158), and then performs the locking process of the gate 300 (step S156).

[0040] (Technical Effect) Next, the technical effect obtained by the authentication system 10 according to the first embodiment will be described.

[0041] As described with reference to FIGS. 1 to 7, in the authentication system 10 according to the first embodiment, blurring photography is performed until the presence of the authentication target is detected, and when the presence of the authentication target is detected, a switch to normal photography is made. By doing so, for example, it is possible to suppress the execution of normal photography (i.e., photography without blurring) for users who do not intend to be authenticated, and thus it is possible to appropriately execute the authentication process for the authentication target while taking into account the privacy of each user.

[0042] <Second Embodiment> The authentication system 10 according to the second embodiment will be described with reference to FIG. 8. Note that the second embodiment is only different from the above-described first embodiment in some operations, and the other parts may be the same as those of the first embodiment. Therefore, hereinafter, the parts different from the already described first embodiment will be described in detail, and the description of the other overlapping parts will be omitted as appropriate.

[0043] (Flow of Operations) First, with reference to FIG. 8, the flow of operations of the authentication system 10 according to the second embodiment will be described. FIG. 8 is a flowchart showing the flow of operations by the authentication system according to the second embodiment. In FIG. 8, the same reference numerals are given to the same processes as those shown in FIG. 4.

[0044] As shown in FIG. 8, when the operation by the authentication system 10 according to the second embodiment is started, first, the target detection unit 110 acquires a blurred image captured by blurred photography (step S101). Then, the target detection unit 110 detects a face from the acquired blurred image (step S201). Here, the face detection method is not particularly limited, and it is not necessary to detect the detailed position and shape of the face. The face detection may be performed, for example, by skeleton detection. If no face is detected from the blurred image (step S201: NO), the process may start again from step S101.

[0045] On the other hand, when a face is detected from the blurred image (step S201: YES), the target detection unit 110 further determines whether the size of the detected face is larger than a predetermined threshold (step S202). The size of the face may be determined from the blurred image. Note that the "predetermined threshold" here is set as a threshold for determining whether the user whose face is detected is approaching the camera 18 with the intention of being authenticated. For example, when the size of the face is larger than the predetermined threshold, it is obvious that the user is approaching the camera 18, so it can be determined that the user has the intention of being authenticated (i.e., the user is the authentication target). On the other hand, when the size of the face is smaller than the predetermined threshold, for example, it cannot be said that the user has the intention of being authenticated just by passing near the camera (i.e., the user is not the authentication target at the current time). When it is determined that the size of the detected face is smaller than the predetermined threshold (step S202: NO), the process may start again from step S101.

[0046] On the other hand, when it is determined that the size of the detected face is larger than the predetermined threshold (step S202: YES), the switching unit 120 instructs the filter switching unit 22 to switch the filter, and switches the blurred shooting to normal shooting (step S103). After that, the authentication unit 130 acquires a normal image captured by normal shooting (step S104). Then, the authentication unit 130 executes an authentication process for the authentication target based on the acquired normal image (step S105).

[0047] (Technical effect) Next, the technical effects obtained by the authentication system 10 according to the second embodiment will be described.

[0048] As described with reference to FIG. 8, in the authentication system 10 according to the second embodiment, a face is detected from the blurred image, and the blurred shooting is switched to normal shooting based on the size of the detected face. In this way, it is possible to suppress the execution of normal shooting for users who do not have the intention of being authenticated, so that the authentication process for the authentication target can be appropriately executed while considering the privacy of each user.

[0049] <Third Embodiment> The authentication system 10 according to the third embodiment will be described with reference to FIG. 9. Note that the third embodiment only differs in some operations from the above-described first and second embodiments, and the other parts may be the same as those of the first and second embodiments. For this reason, in the following, the parts different from the embodiments already described will be described in detail, and the description of the other overlapping parts will be omitted as appropriate.

[0050] (Flow of Operations) First, with reference to FIG. 9, the flow of operations of the authentication system 10 according to the third embodiment will be described. FIG. 9 is a flowchart showing the flow of operations by the authentication system according to the third embodiment. Note that in FIG. 9, the same reference numerals are given to the same processes as those shown in FIG. 4.

[0051] As shown in FIG. 9, when the operation by the authentication system 10 according to the third embodiment is started, first, the target detection unit 110 acquires a blurred image captured by blurred photography (step S101). Then, the target detection unit 110 detects a moving object from the acquired blurred image (step S301). The detection method here is not particularly limited. For example, a moving object may be detected from the difference between consecutive frames. If no moving object is detected from the blurred image (step S301: NO), the process may be started again from step S101.

[0052] On the other hand, when a moving object is detected from the blurred image (step S301: YES), the target detection unit 110 further determines whether the detected moving object is approaching the camera 18 (step S302). This determination may be realized, for example, by motion path analysis. If it is determined that the moving object is not approaching the camera 18 (step S302: NO), it can be determined that, for example, the user does not intend to be authenticated just by passing near the camera (that is, is not an authentication target at the current time), and the process may be started again from step S101.

[0053] On the other hand, when it is determined that a moving object is approaching camera 18 (step S302: YES), it can be determined that the user has the intention to be authenticated (i.e., the user is the authentication target). Therefore, the switching unit 120 instructs the filter switching unit 22 to switch the filter, and switches the blurred shooting to normal shooting (step S103). After that, the authentication unit 130 acquires a normal image captured by normal shooting (step S104). At this time, the authentication unit 130 may execute a process of detecting the face of the moving object from the normal image. Then, the authentication unit 130 executes an authentication process for the authentication target based on the acquired normal image (step S105).

[0054] (Technical effect) Next, the technical effect obtained by the authentication system 10 according to the third embodiment will be described.

[0055] As described with reference to FIG. 9, in the authentication system 10 according to the third embodiment, when a moving object is detected from the blurred image and the object approaches camera 18, the blurred shooting is switched to normal shooting. In this way, it is possible to suppress the execution of normal shooting for users without the intention to be authenticated, so that the authentication process for the authentication target can be appropriately executed while taking into account the privacy of each user.

[0056] <Fourth Embodiment> The authentication system 10 according to the fourth embodiment will be described with reference to FIGS. 10 and 11. Note that the fourth embodiment is only different from the first to third embodiments described above in some operations, and the other parts may be the same as those of the first to third embodiments. Therefore, hereinafter, the parts different from the embodiments already described will be described in detail, and the description of the other overlapping parts will be omitted as appropriate.

[0057] (Operation flow) First, with reference to FIG. 10, the operation flow of the authentication system 10 according to the fourth embodiment will be described. FIG. 10 is a flowchart showing the operation flow by the authentication system according to the fourth embodiment. In FIG. 10, the same reference numerals are given to the processes similar to those shown in FIG. 4.

[0058] As shown in FIG. 10, when the operation by the authentication system 10 according to the fourth embodiment is started, first, the target detection unit 110 acquires a blurred image captured by blurred photography (step S101). Then, the target detection unit 110 detects the presence of the authentication target based on the acquired blurred image (step S102). If the authentication target is not detected from the blurred image (step S102: NO), the process may be started again from step S101.

[0059] On the other hand, when the authentication target is detected from the blurred image (step S102: YES), the target detection unit 110 identifies the face region of the authentication target (that is, the region where the face of the authentication target exists) from the blurred image (step S401). Then, the switching unit 120 according to this embodiment switches only the identified face region from blurred photography to normal photography (step S402). In other words, the regions other than the face region remain in blurred photography. After that, the authentication unit 130 acquires a normal image captured by normal photography (step S104). Then, the authentication unit 130 executes an authentication process for the authentication target based on the acquired normal image (step S105).

[0060] (Removal of Blurring of Face Region) Next, with reference to FIG. 11, an example of the case where only the above-described face region is de-blurred will be described. FIG. 11 is a plan view showing an example of a blurred image and a normal image captured by the authentication system according to the fourth embodiment.

[0061] As shown in Fig. 11, in the standby state (i.e., the state where the authentication process is not being executed), the camera 18 performs blurred shooting. And in this embodiment, when the presence of the authentication target is detected and the authentication state (i.e., the state where the authentication process is being executed) is entered, as already explained, only the face region of the authentication target has the blurred shooting switched to normal shooting. For this reason, in the image captured by the camera 18, only the face region is clear (i.e., an image on which the authentication process can be executed), and the regions other than the face region remain unclear.

[0062] In this way, even when only the face region is subject to normal shooting, for example, face authentication can be executed normally. Note that when it is desired to perform authentication using regions other than the face, instead of the face region, only the other regions used for authentication may be switched to normal shooting.

[0063] (Technical Effect) Next, the technical effect obtained by the authentication system 10 according to the fourth embodiment will be described.

[0064] As described with reference to Figs. 10 and 11, in the authentication system 10 according to the fourth embodiment, only the face of the authentication target is switched from blurred shooting to normal shooting. By doing so, since the entire image does not become clear even during authentication, for example, while taking into account the privacy of other users captured behind the authentication target (i.e., the regions other than the face region of the authentication target), the authentication process of the authentication target can be appropriately executed.

[0065] <Fifth Embodiment> The authentication system 10 according to the fifth embodiment will be described with reference to Figs. 12 and 13. Note that the fifth embodiment only differs in some operations from the above-described fourth embodiment, and the other parts may be the same as those of the first to fourth embodiments. For this reason, hereinafter, the parts different from the already-described embodiments will be described in detail, and the description of the other overlapping parts will be omitted as appropriate.

[0066] (Flow of Operations) First, with reference to FIG. 12, the operation flow of the authentication system 10 according to the fifth embodiment will be described. FIG. 12 is a flowchart showing the operation flow by the authentication system according to the fifth embodiment. In FIG. 12, the same reference numerals are given to the processes similar to those shown in FIG. 10.

[0067] As shown in FIG. 12, when the operation by the authentication system 10 according to the fifth embodiment is started, first, the target detection unit 110 acquires a blurred image captured by blurred photography (step S101). Then, the target detection unit 110 detects the presence of the authentication target based on the acquired blurred image (step S102). If the authentication target is not detected from the blurred image (step S102: NO), the process may start again from step S101.

[0068] On the other hand, when the authentication target is detected from the blurred image (step S102: YES), the target detection unit 110 specifies the face region of the authentication target from the blurred image (step S401). After that, the target detection unit 110 determines whether there are a plurality of face regions in the blurred image (step S501). If it is determined that there are no multiple face regions in the blurred image (that is, only one face region is specified) (step S501: NO), the switching unit 120 switches only the specified face region from blurred photography to normal photography (step S402).

[0069] On the other hand, when there are a plurality of face regions in the blurred image (step S501: YES), the target detection unit 110 selects the face region closest to the camera 18 (step S502). The face region closest to the camera 18 may be determined, for example, based on the size of the face region in the blurred image. Then, the switching unit 120 switches only the selected face region from blurred photography to normal photography (step S502). In other words, the face regions of users other than the first one remain in blurred photography.

[0070] Thereafter, the authentication unit 130 acquires a normal image captured by normal shooting (step S104). Then, the authentication unit 130 executes an authentication process for the authentication target based on the acquired normal image (step S105).

[0071] (Unblurring of the face region) Next, with reference to FIG. 13, an example of the case where only the blurring of the leading face region described above is removed will be described. FIG. 13 is a plan view showing an example of a blurred image and a normal image captured by the authentication system according to the fifth embodiment.

[0072] As shown in FIG. 13, the camera 18 performs blurred shooting in the standby state (i.e., the state where the authentication process is not being executed). In this embodiment, when the presence of the authentication target is detected and the authentication state (i.e., the state where the authentication process is being executed) is entered, as already described, only the face region of the leading authentication target closest to the camera is switched from blurred shooting to normal shooting. For this reason, the image captured by the camera 18 is such that only the face region of the leading user is clear (i.e., an image on which the authentication process can be executed), and the other regions remain unclear. Note that the regions other than the face regions of users other than the leading one may be switched from blurred shooting to normal shooting. In this case, only the face regions of users other than the leading one are subject to blurred shooting even in the authentication state.

[0073] When a plurality of users are captured by the camera, the target for which the authentication process should be executed first is considered to be the user closest to the camera 18. For this reason, even if the face regions of users other than the leading one remain subject to blurred shooting, no particular problem occurs. For users other than the leading one, the authentication process may be executed after the authentication process for the leading user is completed and the leading user has left. That is, for users other than the leading one, the authentication process may be executed again after becoming the leading one.

[0074] (Technical effects) Next, the technical effects obtained by the authentication system 10 according to the fifth embodiment will be described.

[0075] As described with reference to FIGS. 12 and 13, in the authentication system 10 according to the fifth embodiment, only the face of the first authentication target is switched from blurred shooting to normal shooting. By doing so, since the entire image does not become clear even during authentication, for example, while taking into account the privacy of other users standing behind the first authentication target, the authentication process of the authentication target can be appropriately executed. <Sixth Embodiment> The authentication system 10 according to the sixth embodiment will be described with reference to FIG. 14. Note that the sixth embodiment is only different in some operations from the first to fifth embodiments described above, and the other parts may be the same as those of the first to fifth embodiments. For this reason, hereinafter, parts different from the already described embodiments will be described in detail, and descriptions of other overlapping parts will be omitted as appropriate.

[0076] (Flow of Operations) First, with reference to FIG. 14, the flow of operations of the authentication system 10 according to the sixth embodiment will be described. FIG. 14 is a flowchart showing the flow of operations by the authentication system according to the sixth embodiment. Note that in FIG. 14, the same reference numerals are given to the same processes as those shown in FIG. 4.

[0077] As shown in FIG. 14, when the operation by the authentication system 10 according to the sixth embodiment is started, first, the target detection unit 110 acquires a blurred image captured by blurred shooting (step S101). Then, the target detection unit 110 detects the presence of the authentication target based on the acquired blurred image (step S102). Note that if the authentication target is not detected from the blurred image (step S102: NO), the process may start again from step S101.

[0078] On the other hand, when an authentication target is detected from the blurred image (step S102: YES), the switching unit 120 instructs the filter switching unit 22 to switch the filter, and switches the blurred shooting to normal shooting (step S103). After that, the authentication unit 130 acquires a normal image captured by normal shooting (step S104). Then, the authentication unit 130 executes an authentication process for the authentication target based on the acquired normal image (step S105).

[0079] Subsequently, in particular in this embodiment, the switching unit 120 instructs the filter switching unit 22 to switch the filter, and switches the blurred shooting to normal shooting (step S601). Therefore, after the authentication process for the authentication target is executed, blurred shooting is performed again. As a result, a clear normal image cannot be obtained, but since the authentication process for the authentication target has already been completed, there is no particular problem. Note that when a new authentication target is detected, the blurred shooting may be switched back to normal shooting again.

[0080] (Technical Effect) Next, the technical effect obtained by the authentication system 10 according to the sixth embodiment will be described.

[0081] As described with reference to FIG. 14, in the authentication system 10 according to the sixth embodiment, when the authentication process for the authentication target is completed, the normal shooting is switched to the blurred shooting. By doing so, the time during which the normal shooting is performed can be shortened (limited only to the timing of executing the authentication process), so it is possible to more appropriately protect the privacy of users who are not the authentication target.

[0082] <Seventh Embodiment> The authentication system 10 according to the seventh embodiment will be described with reference to FIG. 15. Note that the seventh embodiment is only different in some operations from the first to sixth embodiments described above, and the other parts may be the same as those of the first to sixth embodiments. Therefore, hereinafter, the parts different from the embodiments already described will be described in detail, and the description of the other overlapping parts will be omitted as appropriate.

[0083] (Step-by-step blurring removal) First, with reference to FIG. 15, the step-by-step blurring removal executed in the authentication system 10 according to the seventh embodiment will be described. FIG. 15 is a plan view showing an example of an image captured while gradually increasing the sharpness in the authentication system according to the seventh embodiment.

[0084] As shown in FIG. 17, in the authentication system 10 according to the seventh embodiment, when detecting an authentication target and switching from blurred shooting to normal shooting, the sharpness is gradually increased. Specifically, the sharpness is gradually increased according to the proximity of the distance between the authentication target and the camera 18. In the example shown in the figure, when the authentication target is not detected, an image with a "strong" blurring degree and low sharpness is obtained. After that, when the authentication target is detected, the blurring degree becomes "weak" and an image with medium sharpness is obtained. Further, when the authentication target approaches the camera 18, there is "no" blurring and an image with high sharpness is obtained.

[0085] Here, an example where the sharpness is increased step by step is given, but the sharpness may be increased linearly. Also, when the distance between the authentication target and the camera 18 becomes farther (for example, when the authentication target returns midway), the sharpness may be decreased according to the distance. Further, when the authentication target is at a position far enough that the face cannot be discriminated, it may be set to "no" blurring and the sharpness may be increased.

[0086] The process of increasing the sharpness described above may be executed regardless of the authentication process. For example, regardless of whether the authentication process is successful, the sharpness may be gradually increased only according to the distance between the authentication target and the camera 18. Alternatively, the process of increasing the sharpness described above may be executed while emphasizing the authentication process. For example, the sharpness may be gradually increased until the authentication process is successful, and the process of increasing the sharpness may be terminated at the timing when the authentication process is successful.

[0087] (Technical effects) Next, the technical effects obtained by the authentication system 10 according to the seventh embodiment will be described.

[0088] As described with reference to FIG. 15, in the authentication system 10 according to the seventh embodiment, when switching from blurred shooting to normal shooting, the sharpness is controlled to gradually increase. By doing so, it is possible to suppress a sudden increase in sharpness immediately after the authentication target is detected, so that the privacy of users other than the target to be authenticated can be more appropriately protected. For example, even if a user who actually has no intention of authentication is detected as the authentication target, a high - sharpness image is not immediately acquired, so that privacy can be appropriately protected.

[0089] <Eighth Embodiment> The authentication system 10 according to the eighth embodiment will be described with reference to FIGS. 16 and 17. Note that the eighth embodiment only differs in some configurations and operations from the first to seventh embodiments described above, and the other parts may be the same as those of the first to seventh embodiments. Therefore, hereinafter, the parts different from the embodiments already described will be described in detail, and the description of the other overlapping parts will be omitted as appropriate.

[0090] (Functional Configuration) First, with reference to FIG. 16, the functional configuration of the authentication system 10 according to the eighth embodiment will be described. FIG. 16 is a block diagram showing the functional configuration of the authentication system according to the eighth embodiment. In FIG. 16, the same reference numerals are given to the elements similar to those shown in FIG. 3.

[0091] As shown in FIG. 16, the authentication system 10 according to the eighth embodiment includes a camera 18 and a processing unit 100. In particular, the processing unit 100 according to the eighth embodiment includes a target detection unit 110, a switching unit 120, an authentication unit 130, and an image storage unit 140 as components for realizing its functions. That is, the processing unit 100 according to the eighth embodiment further includes an image storage unit 140 in addition to the configuration according to the first embodiment (see FIG. 3). Note that the image storage unit 140 may be realized by, for example, the above-described storage device 14 (see FIG. 1).

[0092] The image storage unit 140 is configured to be able to store normal images captured by the camera 18. The image storage unit 140 may store all the normal images captured in normal shooting, or may store only the images used in the authentication process among the normal images. In addition, the image storage unit 140 may be configured to be able to store blurred images in addition to the normal images. The image storage unit 140 is configured to be able to determine whether to store a normal image according to the result of the authentication process. Specifically, the image storage unit 140 stores a normal image when the authentication process is successful, and does not store (i.e., discards) the normal image when the authentication process fails. The image storage unit 140 may be configured to be able to store the authentication result as a log.

[0093] (Flow of operations) Next, with reference to FIG. 17, the flow of operations of the authentication system 10 according to the eighth embodiment will be described. FIG. 17 is a flowchart showing the flow of operations by the authentication system according to the eighth embodiment. In FIG. 17, the same reference numerals are given to the same processes as those shown in FIG. 4.

[0094] As shown in FIG. 17, when the operation by the authentication system 10 according to the eighth embodiment is started, first, the target detection unit 110 acquires a blurred image captured by blurred photography (step S101). Then, the target detection unit 110 detects the presence of the authentication target based on the acquired blurred image (step S102). If the authentication target is not detected from the blurred image (step S102: NO), the process may start again from step S101.

[0095] On the other hand, when the authentication target is detected from the blurred image (step S102: YES), the switching unit 120 instructs the filter switching unit 22 to switch the filter, and switches the blurred photography to normal photography (step S103). After that, the authentication unit 130 acquires a normal image captured by normal photography (step S104). Then, the authentication unit 130 executes an authentication process for the authentication target based on the acquired normal image (step S105).

[0096] Subsequently, in this embodiment, it is determined whether or not the authentication process by the authentication unit 130 has succeeded (step S801). When the authentication process has succeeded (step S801: YES), the image storage unit 140 stores the normal image of the authentication target for which the authentication process has succeeded (step S802). On the other hand, when the authentication process has failed (step S801: NO), the image storage unit 140 discards the normal image of the authentication target for which the authentication process has failed (step S803). When discarding the normal image, the image storage unit 140 may store the configuration information of the authentication target and the blurred image.

[0097] In addition, as in the fourth and fifth embodiments described above, when shooting with partial blurring of the image removed, for the authentication target for which the authentication process has succeeded, the image storage unit 140 may perform image processing and store the image with the overall blurring removed, and for the authentication target for which the authentication process has failed, store the image with partial blurring removed as it is.

[0098] Further, the user may be notified in advance of storing an image, and the user may be allowed to select whether to permit the storage of a normal image. Also, the user may be allowed to set the degree of an image for which storage may be permitted. In this case, for example, settings such as "storage may be permitted for an image that is clear only for the face" or "storage may be permitted for an image with low sharpness" may be made possible.

[0099] (Technical Effect) Next, the technical effect obtained by the authentication system 10 according to the eighth embodiment will be described.

[0100] As described with reference to FIGS. 16 and 17, in the authentication system 10 according to the eighth embodiment, a normal image of an authentication target for which the authentication process has been successfully completed is stored. By doing so, various operations can be performed by utilizing the stored past images. For example, when a problem occurs at a later date, etc., an operation for confirming the authentication history and the like can be performed.

[0101] <Ninth Embodiment> The authentication system 10 according to the ninth embodiment will be described with reference to FIGS. 18 and 19. Note that the ninth embodiment is different only in some configurations and operations from the first to eighth embodiments described above, and the other parts may be the same as those of the first to eighth embodiments. For this reason, hereinafter, the parts different from the embodiments already described will be described in detail, and the description of the other overlapping parts will be omitted as appropriate.

[0102] (Functional Configuration) First, with reference to FIG. 18, the functional configuration of the authentication system 10 according to the ninth embodiment will be described. FIG. 18 is a block diagram showing the functional configuration of the authentication system according to the ninth embodiment. Note that, in FIG. 18, the same reference numerals are given to the same elements as those shown in FIG. 3.

[0103] As shown in FIG. 18, the authentication system 10 according to the ninth embodiment includes a camera 18 and a processing unit 100. In particular, the processing unit 100 according to the ninth embodiment includes a target detection unit 110, a predetermined action detection unit 150, a switching unit 120, and an authentication unit 130 as components for realizing its functions. That is, the processing unit 100 according to the ninth embodiment further includes a predetermined action detection unit 150 in addition to the configuration according to the first embodiment (see FIG. 3). Note that the predetermined action detection unit 150 may be a functional block realized by, for example, the above-described processor 11 (see FIG. 1).

[0104] The predetermined action detection unit 150 is configured to be able to detect a predetermined action by an authentication target. The predetermined action may be, for example, a gesture set in advance. Gestures may include body movements, hand movements, vocalizations, face orientations, foot tapping, etc. in addition to body language and hand gestures. Further, the predetermined action may include suspicious actions. Suspicious actions may be, for example, actions such as staying in a predetermined area for a long time, crouching down, or leaving luggage unattended. The predetermined action detection unit 150 may detect the predetermined action from the blurred image, or may detect it using a separate sensor or another camera. For example, the predetermined action detection unit 150 may determine whether the target is walking along a specific footprint using a pressure sensor. Alternatively, the predetermined action detection unit 150 may confirm and determine the walking position from the overall image captured by the overhead camera. In addition to or instead of the above-described predetermined action, the predetermined action detection unit 150 may detect a smart tag, a smart device, a uniform, a badge, a chameleon cord, etc. worn by the target.

[0105] (Flow of operations) Next, with reference to FIG. 19, the flow of operations of the authentication system 10 according to the ninth embodiment will be described. FIG. 19 is a flowchart showing the flow of operations of the authentication system according to the ninth embodiment. In FIG. 19, the same reference numerals are given to the same processes as those shown in FIG. 4.

[0106] As shown in FIG. 19, when the operation by the authentication system 10 according to the ninth embodiment is started, first, the target detection unit 110 acquires a blurred image captured by blurred photography (step S101). Then, the target detection unit 110 detects the presence of the authentication target based on the acquired blurred image (step S102). If the authentication target is not detected from the blurred image (step S102: NO), the process may start again from step S101.

[0107] Subsequently, when the authentication target is detected from the blurred image (step S102: YES), the predetermined action detection unit 150 detects a predetermined action by the authentication target (step S902). If the predetermined action by the authentication target is not detected (step S902: NO), the process may start again from step S101.

[0108] When the predetermined action by the authentication target is detected (step S902: YES), the switching unit 120 instructs the filter switching unit 22 to switch the filter, and switches the blurred photography to normal photography (step S103). That is, in the authentication system 10 according to the ninth embodiment, when the authentication target is detected and the authentication target is performing a predetermined action, the blurred photography is switched to normal photography. After that, the authentication unit 130 acquires a normal image captured by normal photography (step S104). Then, the authentication unit 130 executes an authentication process for the authentication target based on the acquired normal image (step S105).

[0109] In the above-described example, an example was given in which a predetermined action is detected only when the presence of an authentication target is detected (for example, when there is a target with an intention to authenticate). However, the predetermined action may be detected from a user other than the authentication target. For example, the predetermined action may be detected from all users included in the imaging range of the camera. In this case, taking the predetermined action may be set as a condition when detecting as an authentication target. The switching unit 120 may switch from the blurred imaging to the normal imaging only for the area in which the user who has taken the predetermined action appears. Further, when there are a plurality of users who have taken the predetermined action, the blurred imaging may be switched to the normal imaging for some or all of those users.

[0110] The authentication system 10 according to the ninth embodiment may be configured as a system installed for monitoring purposes in various facilities. For example, the authentication system 10 may be configured as a system for monitoring whether there are any suspicious persons in residential facilities such as condominiums, public facilities, or shopping malls. In this case, when the target takes a predetermined suspicious action (an action to be determined as a pre-registered suspicious action), the blurred imaging may be switched to the normal imaging.

[0111] (Technical effects) Next, the technical effects obtained by the authentication system 10 according to the ninth embodiment will be described.

[0112] As described with reference to FIGS. 18 and 19, in the authentication system 10 according to the ninth embodiment, when a predetermined action is detected, the blurred imaging is switched to the normal imaging. By doing so, it is possible to more appropriately determine the user who desires the authentication process and execute the authentication process while taking privacy into consideration. Further, it is possible to determine a user who does not desire the authentication process but should perform normal imaging (for example, a suspicious person, etc.) and switch the blurred imaging to the normal imaging.

[0113] <Tenth Embodiment> The authentication system 10 according to the tenth embodiment will be described with reference to FIGS. 20 and 21. Note that the tenth embodiment is only different from the first to ninth embodiments described above in some configurations and operations, and the other parts may be the same as those of the first to ninth embodiments. For this reason, in the following, the parts different from the embodiments already described will be described in detail, and the description of the other overlapping parts will be omitted as appropriate.

[0114] (Functional configuration) First, with reference to FIG. 20, the functional configuration of the authentication system 10 according to the tenth embodiment will be described. FIG. 20 is a block diagram showing the functional configuration of the authentication system according to the tenth embodiment. In FIG. 20, the same reference numerals are given to the elements similar to those shown in FIG. 3.

[0115] As shown in FIG. 20, the authentication system 10 according to the tenth embodiment includes a camera 18, a processing unit 100, and a settlement unit 500. That is, the authentication system 10 according to the tenth embodiment further includes a settlement unit 500 in addition to the configuration according to the first embodiment (see FIG. 3). Note that the settlement unit 500 may be a functional block realized by, for example, the above-described processor 11 (see FIG. 1). Further, the settlement unit 500 may be provided in the processing unit 100.

[0116] The settlement unit 500 is configured to be able to execute a settlement process for the authentication target. The settlement unit 500 may be provided, for example, as a store's cash register terminal. When the authentication process for the authentication target is successful, the settlement unit 500 may perform a settlement process for the product that the authentication target intends to purchase using a settlement method associated with the authentication target (for example, credit card, debit from a bank account, etc.). On the other hand, when the authentication process for the authentication target fails, the settlement process may not be performed.

[0117] (Flow of operation) Next, with reference to FIG. 21, the operation flow of the authentication system 10 according to the tenth embodiment will be described. FIG. 21 is a flowchart showing the operation flow of the authentication system according to the tenth embodiment. In FIG. 21, the same reference numerals are given to the processes similar to those shown in FIG. 4.

[0118] As shown in FIG. 21, when the operation by the authentication system 10 according to the tenth embodiment is started, first, the target detection unit 110 acquires a blurred image captured by blurred photography (step S101). Then, based on the acquired blurred image, the target detection unit 110 detects a settlement action by the authentication target (step S1001). The "settlement action" here may be preset as an action for determining whether there is an intention to settle by the authentication target. The settlement action may be, for example, an action of causing a product to be read by a cash register terminal. Alternatively, as the settlement action, it may be detected that the authentication target has entered a predetermined range (for example, the position of the authentication target has reached the vicinity of the cash register). In this case, the position information of the authentication target may be detected from the blurred image or may be detected using other sensors, cameras, etc. By combining the above, a settlement action may be detected when the authentication target enters a predetermined range and the product is read by the cash register terminal. If no settlement action is detected (step S1101: NO), the process may be started again from step S101.

[0119] On the other hand, when a settlement action is detected (step S1101: YES), the switching unit 120 instructs the filter switching unit 22 to switch the filter, and switches the blurred photography to normal photography (step S103). After that, the authentication unit 130 acquires a normal image captured by normal photography (step S104). Then, based on the acquired normal image, the authentication unit 130 executes an authentication process for the authentication target (step S105). And when the authentication process by the authentication unit 130 is successful, the settlement unit 500 executes a settlement process (step S1002).

[0120] (Technical effect) Next, the technical effects obtained by the authentication system 10 according to the tenth embodiment will be described.

[0121] As described with reference to FIGS. 20 and 21, in the authentication system 10 according to the tenth embodiment, when a settlement action is detected, the blurred photography is switched to normal photography. In this way, it is possible to appropriately execute the authentication process and the settlement process of the authentication target while taking into account the privacy of the user.

[0122] <Eleventh Embodiment> The authentication system 10 according to the eleventh embodiment will be described with reference to FIGS. 22 and 23. Note that the eleventh embodiment is only different from the first to tenth embodiments described above in some configurations and operations, and the other parts may be the same as those of the first to tenth embodiments. For this reason, in the following, the parts different from the embodiments already described will be described in detail, and the description of the other overlapping parts will be omitted as appropriate.

[0123] (Functional Configuration) First, with reference to FIG. 22, the functional configuration of the authentication system 10 according to the eleventh embodiment will be described. FIG. 22 is a block diagram showing the functional configuration of the authentication system according to the eleventh embodiment. In FIG. 22, the same reference numerals are given to the elements similar to those shown in FIG. 3.

[0124] As shown in FIG. 22, the authentication system 10 according to the eleventh embodiment includes a camera 18, a processing unit 100, and a display unit 600. That is, the authentication system 10 according to the eleventh embodiment further includes a display unit 600 in addition to the configuration according to the first embodiment (see FIG. 3). Note that the display unit 600 may be realized by, for example, the output device 16 described above (see FIG. 1).

[0125] The display unit 600 is configured to be able to display the images captured by the camera 18. That is, when the camera 18 is performing defocused shooting, the display unit 600 displays a defocused image, and when performing normal shooting, the display unit 600 displays a normal image. Note that the display unit 600 may be configured to display towards the monitor 30 shown in FIG. 5 (i.e., configured to perform display towards the authentication target). Alternatively, the display unit 600 may be configured to perform display towards something other than the authentication target. For example, the display unit 600 may be configured as a monitor for a supervisor or a system administrator to view.

[0126] (Flow of operations) Next, with reference to FIG. 23, the flow of operations of the authentication system 10 according to the 11th embodiment will be described. FIG. 22 is a flowchart showing the flow of operations of the authentication system according to the 11th embodiment. Note that in FIG. 22, the same reference numerals are given to the same processes as those shown in FIG. 4.

[0127] As shown in FIG. 22, when the operation by the authentication system 10 according to the 11th embodiment is started, first, the target detection unit 110 acquires a defocused image captured by defocused shooting (step S101). At this time, the display unit 600 displays the defocused image captured by defocused shooting (step S902). Then, the target detection unit 110 detects the presence of the authentication target based on the acquired defocused image (step S102). Note that if the authentication target is not detected from the defocused image (step S102: NO), the process may start again from step S101.

[0128] On the other hand, if the authentication target is detected from the defocused image (step S102: YES), the switching unit 120 instructs the filter switching unit 22 to switch the filter, and switches the defocused shooting to normal shooting (step S103). At this time, the display unit 600 displays the normal image captured by normal shooting (step S902). After that, the authentication unit 130 acquires the normal image captured by normal shooting (step S104). Then, the authentication unit 130 executes the authentication process of the authentication target based on the acquired normal image (step S105).

[0129] (Technical Effect) Next, the technical effect obtained by the authentication system 10 according to the 11th embodiment will be described.

[0130] As described with reference to FIGS. 22 and 23, in the authentication system 10 according to the 10th embodiment, until the authentication target is detected, a blurred image captured by blurred photography is displayed, and after the authentication target is detected, a normal image captured by normal photography is displayed. In this way, the privacy of the displayed image can be protected. For example, even when a user enters the imaging range of the camera, until the user is detected as an authentication target, the user's image is displayed as a blurred image. Therefore, it is possible to prevent a clear image of the user from being displayed without the intention of authentication.

[0131] <Other Application Examples> The application examples of the authentication system 10 according to each of the above-described embodiments will be further described.

[0132] The authentication system 10 according to the present embodiment may be configured as a system installed at an airport. For example, the authentication system 10 may be configured as a system for authenticating each passenger when boarding an airplane. The camera 18 may be installed, for example, at the boarding gate. In this case, by adopting the configuration of releasing the blurring only for the leading face region as described in the 5th embodiment, it is possible to appropriately execute the authentication process while protecting the privacy of other users near the gate.

[0133] A program for operating the configuration of the embodiment so as to realize the functions of each of the above-described embodiments is recorded on a recording medium, the program recorded on the recording medium is read as code, and a processing method executed on a computer is also included in the scope of each embodiment. That is, a computer-readable recording medium is also included in the scope of each embodiment. In addition, of course, the recording medium on which the above-described program is recorded and the program itself are included in each embodiment.

[0134] As the recording medium, for example, a floppy (registered trademark) disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a magnetic tape, a non-volatile memory card, or a ROM can be used. Further, not limited to those that execute processing with only the program recorded on the recording medium, those that operate on the OS and execute processing in cooperation with the functions of other software and expansion boards are also included in the scope of each embodiment. Furthermore, the program itself may be stored in a server so that a part or all of the program can be downloaded from the server to the user terminal.

[0135] <Supplementary Note> Regarding the embodiments described above, they can be further described as follows in the supplementary note below, but are not limited thereto.

[0136] (Supplementary Note 1) The authentication system described in Supplementary Note 1 includes imaging means capable of switching between normal imaging and blurred imaging in which imaging is performed in a state with lower sharpness than the normal imaging, target detection means for detecting an authentication target based on the blurred image obtained by the blurred imaging, switching means for switching from the blurred imaging to the normal imaging when the authentication target is detected, and authentication means for performing authentication processing of the authentication target based on the normal image obtained by the normal imaging.

[0137] (Supplementary Note 2) The authentication system described in Supplementary Note 2 is the authentication system described in Supplementary Note 1, wherein the target detection means detects the face as the face of the authentication target when a face is detected in the blurred image and the size of the face is larger than a predetermined threshold value.

[0138] (Supplementary Note 3) The authentication system described in Supplementary Note 3 is the authentication system described in Supplementary Note 1, wherein the target detection means detects a moving object as the authentication target when a moving object is detected in the blurred image and the moving object is approaching the imaging means side.

[0139] (Supplementary Note 4) The authentication system described in Supplementary Note 4, wherein the switching means identifies the face area where the face of the authentication target exists, and switches only the face area from the blurred shooting to the normal shooting, is the authentication system according to any one of Supplementary Notes 1 to 3.

[0140] (Supplementary Note 5) The authentication system described in Supplementary Note 5, wherein the switching means switches only the face area of the authentication target closest to the imaging means from the blurred shooting to the normal shooting when a plurality of authentication targets are detected, is the authentication system according to Supplementary Note 4.

[0141] (Supplementary Note 6) The authentication system described in Supplementary Note 6, wherein the switching means switches the normal shooting to the blurred shooting when the authentication process of the authentication target is completed, is the authentication system according to any one of Claims 1 to 5.

[0142] (Supplementary Note 7) The authentication system described in Supplementary Note 7, wherein the switching means gradually increases the sharpness of the image according to the proximity of the distance between the authentication target and the imaging means when switching from the blurred shooting to the normal shooting, is the authentication system according to any one of Supplementary Notes 1 to 6.

[0143] (Supplementary Note 8) The authentication system described in Supplementary Note 8 further includes image storage means for storing the normal image when the authentication process of the authentication target is successful, while not storing the normal image when the authentication process of the authentication target fails, and is the authentication system according to any one of Supplementary Notes 1 to 7.

[0144] (Supplementary Note 9) The authentication system described in Supplementary Note 9, wherein the switching means switches from the blurred shooting to the normal shooting when the authentication target is detected and a predetermined action by the authentication target is detected, is the authentication system according to any one of Supplementary Notes 1 to 8.

[0145] (Supplementary Note 10) The authentication method described in Supplementary Note 10 is an authentication method using imaging means capable of switching between normal imaging and blurred imaging in which imaging is performed in a state with lower sharpness than the normal imaging. Based on the blurred image obtained by the blurred imaging, an authentication target is detected. When the authentication target is detected, a switch is made from the blurred imaging to the normal imaging, and based on the normal image obtained by the normal imaging, an authentication process for the authentication target is executed.

[0146] (Supplementary Note 11) The recording medium described in Supplementary Note 11 is a recording medium on which a computer program is recorded that causes at least one computer to execute an authentication method using imaging means capable of switching between normal imaging and blurred imaging in which imaging is performed in a state with lower sharpness than the normal imaging. Based on the blurred image obtained by the blurred imaging, an authentication target is detected. When the authentication target is detected, a switch is made from the blurred imaging to the normal imaging, and based on the normal image obtained by the normal imaging, an authentication process for the authentication target is executed.

[0147] (Supplementary Note 12) The computer program described in Supplementary Note 12 is a computer program that causes at least one computer to execute an authentication method using imaging means capable of switching between normal imaging and blurred imaging in which imaging is performed in a state with lower sharpness than the normal imaging. Based on the blurred image obtained by the blurred imaging, an authentication target is detected. When the authentication target is detected, a switch is made from the blurred imaging to the normal imaging, and based on the normal image obtained by the normal imaging, an authentication process for the authentication target is executed.

[0148] This disclosure can be appropriately modified within a range not contrary to the gist or idea of the invention that can be read from the claims and the entire specification, and an authentication system, authentication method, and recording medium involving such modifications are also included in the technical idea of this disclosure.

Explanation of Reference Numerals

[0149] 10 Authentication system 11 Processor 14 Memory device 15 Input device 16 Output device 18 Camera 21 Lens 22 Filter switching unit 23 Image sensor 24 Image processing unit 25 Output unit 30 Monitor 50 Target 100 Processing unit 110 Target detection unit 120 Switching unit 130 Authentication unit 140 Image memory unit 150 Predetermined action detection unit 200 Face authentication terminal 300 Gate 305 Passage confirmation sensor 400 Face authentication server storage 500 Settlement unit 600 Display unit

Claims

1. Imaging means capable of switching between normal imaging and blurred imaging in which imaging is performed in a state with lower sharpness than the normal imaging, Object detection means for detecting an authentication target based on a blurred image obtained by the blurred imaging, Switching means for specifying a face region in which the face of the authentication target exists when the authentication target is detected, and switching only the face region from the blurred imaging to the normal imaging, Authentication means for performing an authentication process of the authentication target based on a normal image obtained by the normal imaging, Comprising, When a plurality of authentication targets are detected, the switching means switches only the face region of the authentication target closest to the imaging means from the blurred imaging to the normal imaging, Authentication system.

2. The object detection means detects the face as the face of the authentication target when a face is detected in the blurred image and the size of the face is larger than a predetermined threshold value. The authentication system according to claim 1.

3. The object detection means detects a moving object as the authentication target when a moving object is detected in the blurred image and the moving object is approaching the imaging means side. The authentication system according to claim 1.

4. When the authentication process of the authentication target is completed, the switching means switches the normal imaging to the blurred imaging. The authentication system according to any one of claims 1 to 3.

5. When switching the blurred imaging to the normal imaging, the switching means gradually increases the sharpness of the image according to the proximity of the distance between the authentication target and the imaging means. The authentication system according to any one of claims 1 to 4.

6. Further comprising image storage means for storing the normal image when the authentication process of the authentication target is successful, while not storing the normal image when the authentication process of the authentication target fails. The authentication system according to any one of claims 1 to 5.

7. At least one computer An authentication method using imaging means capable of switching between normal imaging and blurred imaging in which imaging is performed in a state with lower sharpness than the normal imaging, Detecting an authentication target based on a blurred image obtained by the blurred imaging, When the authentication target is detected, specifying a face region in which the face of the authentication target exists, and switching only the face region from the blurred imaging to the normal imaging, Performing an authentication process of the authentication target based on a normal image obtained by the normal imaging, When a plurality of authentication targets are detected, only the face region of the authentication target closest to the imaging means is switched from the blurred imaging to the normal imaging. Authentication method.

8. An authentication method using an imaging means capable of switching between normal imaging and blurred imaging in which the sharpness is lower than that of the normal imaging, Based on the blurred image obtained by the blurred imaging, an authentication target is detected. When the authentication target is detected, the face region where the face of the authentication target exists is specified, and only the face region is switched from the blurred imaging to the normal imaging. Based on the normal image obtained by the normal imaging, the authentication process of the authentication target is executed. When a plurality of authentication targets are detected, only the face region of the authentication target closest to the imaging means is switched from the blurred imaging to the normal imaging. A computer program for causing at least one computer to execute an authentication method.

9. Normal imaging and an imaging means capable of switching between normal imaging and blurred imaging in which the sharpness is lower than that of the normal imaging, Target detection means for detecting an authentication target based on the blurred image obtained by the blurred imaging, Switching means for switching from the blurred imaging to the normal imaging when the authentication target is detected, Authentication means for executing the authentication process of the authentication target based on the normal image obtained by the normal imaging, Comprising When the switching means switches the blurred imaging to the normal imaging, the degree of blurring of the image is reduced according to the proximity of the distance between the authentication target and the imaging means. Authentication system.

10. At least one computer An authentication method using an imaging means capable of switching between normal imaging and blurred imaging in which the sharpness is lower than that of the normal imaging, Based on the blurred image obtained by the blurred imaging, an authentication target is detected. When the authentication target is detected, switching from the blurred imaging to the normal imaging is performed. Based on the normal image obtained by the normal imaging, the authentication process of the authentication target is executed. When switching the blurred imaging to the normal imaging, the degree of blurring of the image is reduced according to the proximity of the distance between the authentication target and the imaging means. Authentication method.

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