Apparatus, method, and program for biometric image processing
A biometric-image processing apparatus includes a touch panel, a memory, an image-capturing device configured to capture an image of a living body that is in contact with the touch panel to obtain a biometric image, and a processor coupled to the memory. The processor is configured to execute a process including: calculating a distance between the image-capturing device and the living body, and calculating a rotation angle of the living body to the image-capturing device based on the distance.
1. A biometric-image processing apparatus comprising:
a touch panel;
a memory;
an image-capturing device configured to capture an image of a living body when a part of the living body is in contact with the touch panel to obtain a biometric image; and
a processor coupled to the memory and configured to execute a process including:
calculating a distance between the image-capturing device and the living body, and
estimating a rotation angle, in a plane parallel to the touch panel, of the living body to the image-capturing device based on the calculated distance and a correspondence relationship between the distance and the rotation angle obtained in advance.
2. The biometric-image processing apparatus according to claim 1 , wherein the distance is calculated by using the biometric image.
3. The biometric-image processing apparatus according to claim 1 , wherein the process further including:
correcting the biometric image captured by the image-capturing device based on the rotation angle.
4. The biometric-image processing apparatus according to claim 1 , wherein the process further including:
registering a feature extracted from the biometric image and the rotation angle in a database in association with each other.
5. A biometric-image processing method performed by a computer comprising an image-capturing device and a touch panel, the method including:
capturing an image of a living body when a part of the living body is in contact with the touch panel by the image-capturing device;
calculating a distance between the image-capturing device and the living body, and
estimating a rotation angle, in a plane parallel to the touch panel, of the living body to the image-capturing device based on the calculated distance and a correspondence relationship between the distance and the rotation angle obtained in advance.
6. The biometric-image processing method according to claim 5 , wherein the distance is calculated by using the biometric image.
7. The biometric-image processing method according to claim 5 , wherein the method further including:
correcting the biometric image captured by the image-capturing device based on the rotation angle.
8. The biometric-image processing method according to claim 5 , wherein the method further including:
registering a feature extracted from the biometric image and the rotation angle in a database in association with each other.
9. A non-transitory computer-readable storage medium having stored a biometric-image processing program for causing a computer comprising an image-capturing device and a touch panel to perform a process including;
capturing an image of a living body when a part of the living body is in contact with the touch panel by the image-capturing device;
calculating a distance between the image-capturing device and the living body, and
estimating a rotation angle, in a plane parallel to the touch panel, of the living body to the image-capturing device based on the calculated distance and a correspondence relationship between the distance and the rotation angle obtained in advance.
10. The storage medium according to claim 9 , wherein the distance is calculated by using the biometric image.
11. The storage medium according to claim 9 , wherein the process further including:
correcting the biometric image captured by the image-capturing device based on the rotation angle.
12. The storage medium according to claim 9 , wherein the process further including:
registering a feature extracted from the biometric image and the rotation angle in a database in association with each other.