Personal authentication system, personal authentication device, display device, and personal authentication method
A personal authentication system includes: a detection device having a first period in which detection of a detection target body is performed and a second period in which detection of asperities on a surface of the detection target body is performed; and a control device. The detection device has, as input keys for a password, first regions in a detection region. The detection device is configured to allocate mutually different segmented regions in a second region having center coordinates at touch detection coordinates detected in the first region in the first period for each key inputting of the password, and output a segmented image acquired in the segmented region in the second period to the control device for each key inputting of the password. The control device is configured to generate a fingerprint image by synthesizing the segmented images acquired in the respective key inputtings of the password.
1. A personal authentication system comprising:
a detection device having a first period in which detection of a detection target body in contact with or in proximity to a sensor is performed and a second period in which detection of asperities on a surface of the detection target body is performed; and
a control device configured to perform processing in accordance with an output from the detection device,
wherein the detection device has, as input keys for a password, a plurality of first regions in a detection region of the sensor,
wherein the detection device is configured to
allocate mutually different segmented regions in a second region having center coordinates at touch detection coordinates detected in the first region in the first period for each key inputting of the password, and
output a segmented image acquired in the segmented region in the second period to the control device for each key inputting of the password, and
wherein the control device is configured to generate a fingerprint image by synthesizing the segmented images acquired in the respective key inputtings of the password.
2. The personal authentication system according to claim 1 ,
wherein the detection device is configured to
transition from the first period to the second period in accordance with a first control signal output from the control device and
transition from the second period to the first period in accordance with a second control signal output from the control device, and
wherein the control device is configured to
output the first control signal when the touch detection coordinates output from the detection device in the first period is coordinates in the first region and
output the second control signal when having acquired the segmented images in the second period.
3. The personal authentication system according to claim 1 , wherein the number of segmentations of the second region is equal to or smaller than the number of digits of the password.
4. The personal authentication system according to claim 1 ,
wherein the control device is configured to set detection start coordinates at which segmented image acquisition is to be started for each key inputting of the password, and
wherein the detection device is configured to allocate each of the segmented regions in which a corresponding one of the segmented images is to be acquired with the detection start coordinates as a starting point.
5. The personal authentication system according to claim 4 , wherein the segmented regions, in each of which a corresponding one of the segmented images is acquired in the key inputting of the password, are relatively allocated in the second region such that the segmented regions are relatively arranged along a fingerprint scanning direction.
6. The personal authentication system according to claim 5 , wherein the detection start coordinates are relatively set at predetermined intervals in the fingerprint scanning direction in the second region for the respective key inputtings of the password.
7. The personal authentication system according to claim 6 , wherein
the detection device is configured to generate an image of a region including a segmented region for each key inputting of the password, and
the control device is configured to acquire, as a segmented image, an image of a region included in the segmented region and discard an image of a region not included in the segmented region.
8. The personal authentication system according to claim 4 , wherein the segmented regions, in each of which a corresponding one of the segmented images is acquired in the key inputting of the password, are relatively allocated in the second region such that the segmented regions are relatively arranged along two directions of a fingerprint scanning direction and a direction different from the scanning direction.
9. The personal authentication system according to claim 8 , wherein
the detection device is configured to segment a segmented region into a plurality of subframes in the fingerprint scanning direction and generate an image of each subframe for each key inputting of the password, and
the control device is configured to acquire, as one segmented image, the images of the respective subframes corresponding to the segmented region.
10. A personal authentication device comprising:
a detector having a first period in which detection of a detection target body in contact with or in proximity to a sensor is performed and a second period in which detection of asperities on a surface of the detection target body is performed; and
a processor configured to perform processing in accordance with an output from the detector,
wherein the detector has a plurality of first regions as input keys for a password in a detection region of the sensor,
wherein the detector is configured to
allocate mutually different segmented regions in a second region having center coordinates at touch detection coordinates detected in the first region in the first period for each key inputting of the password, and
output a segmented image acquired in the segmented region in the second period to the processor for each key inputting of the password, and
wherein the processor is configured to generate a fingerprint image by synthesizing the segmented images acquired in the respective key inputtings of the password.
11. The personal authentication device according to claim 10 ,
wherein the detector is configured to
transition from the first period to the second period in accordance with a first control signal output from the processor and
transition from the second period to the first period in accordance with a second control signal output from the processor, and
the processor is configured to
output the first control signal when the touch detection coordinates output from the detector in the first period is coordinates in the first region and
output the second control signal when having acquired the segmented images in the second period.
12. The personal authentication device according to claim 10 , wherein the number of segmentations of the second region is equal to or smaller than the number of digits of the password.
13. The personal authentication device according to claim 10 ,
wherein the processor is configured to set detection start coordinates at which segmented image acquisition is to be started for each key inputting of the password, and
wherein the detector is configured to allocate each of the segmented regions in which a corresponding one of the segmented images is to be acquired with the detection start coordinates as a starting point.
14. The personal authentication device according to claim 13 , wherein the segmented regions, in each of which a corresponding one of the segmented images is acquired in the key inputting of the password, are relatively allocated in the second region such that the segmented regions are relatively arranged along a fingerprint scanning direction.
15. The personal authentication device according to claim 14 , wherein the detection start coordinates are relatively set at predetermined intervals in the fingerprint scanning direction in the second region for the respective key inputtings of the password.
16. The personal authentication device according to claim 15 , wherein
the detector is configured to generate an image of a region including a segmented region for each key inputting of the password, and
the processor is configured to acquire, as a segmented image, an image of a region included in the segmented region and discard an image of a region not included in the segmented region.
17. The personal authentication device according to claim 13 , wherein the segmented regions, in each of which a corresponding one of the segmented images is acquired in the key inputting of the password, are relatively allocated in the second region such that the segmented regions are relatively arranged along two directions of a fingerprint scanning direction and a direction different from the scanning direction.
18. The personal authentication device according to claim 17 , wherein
the detector is configured to segment a segmented region into a plurality of subframes in the fingerprint scanning direction and generate an image of each subframe for each key inputting of the password, and
the processor is configured to acquire, as one segmented image, the images of the respective subframes corresponding to the segmented region.
19. A display device comprising:
the personal authentication device according to claim 10 ; and
a display panel in which a display region for displaying an image is provided so as to overlap the detection region of the personal authentication device.
20. A personal authentication method in which
a first period in which detection of a detection target body in contact with or in proximity to a sensor is performed and a second period in which detection of asperities on a surface of the detection target body is performed are provided, and
a plurality of first regions as input keys for a password are provided in a detection region of the sensor,
the personal authentication method comprising:
allocating mutually different segmented regions in a second region having center coordinates at touch detection coordinates detected in the first region in the first period in each key inputting of the password and
generating a fingerprint image by synthesizing a plurality of segmented images acquired in the segmented regions in the second period in the respective key inputtings of the password.