Image processing device, image processing method and computer-readable non-transitory medium

1. An image processing device comprising:

a biometric sensor configured to capture a palm image;

a memory; and

a processor coupled to the memory and the processor configured to execute a process, the process comprising:

detecting two base points of both sides of a first finger and two base points of both sides of a second finger next to the first finger from the palm image, the two base points of the second finger not being overlapped with the two base points of the first finger;

calculating a first standard point between one of the base points of the first finger on the second finger side and one of the base points of the second finger on the first finger side with use of a position of the base point of the first finger on the second finger side and a position of the base point of the second finger on the first finger side;

calculating a second standard point on a bisector of an angle that is formed by a straight line passing through one of the base points of the first finger on an opposite side of the second finger and the first standard point and a straight line passing through one of the base points of the second finger on an opposite side of the first finger, and the first standard point;

applying an affine conversion to the palm image so that coordinates of the first standard point and the second standard point are converted into predetermined coordinates;

collating the palm image after the applying and an enrolled feature; and

outputting a result of the collating,

wherein the first standard point is a midpoint of the base point of the first finger on the second finger side and the base point of the second finger on the first finger side or an intersection point of a straight line passing through the two base points of the first finger and a straight line passing through the two base points of the second finger.

2. An image processing device comprising:

a biometric sensor configured to capture a palm image;

a memory; and

a processor coupled to the memory and the processor configured to execute a process, the process comprising:

detecting two base points of both sides of a middle finger, two base points of both sides of a ring finger, a base point of an index finger on a thumb side, and a base point of a little finger on an opposite side of the ring finger, the two base points of the ring finger not being overlapped with the two base points of the middle finger;

calculating a first standard point between one of the base points of the middle finger on the ring finger side and one of the base points of the ring finger on the middle finger side with use of a position of the base point of the middle finger on the ring finger side and a position of the base point of the ring finger on the middle finger side;

calculating a second standard point on a bisector of an angle that is formed by a straight line passing through one of the base points of the index finger on the thumb side and the first standard point and a straight line passing through the base point of the little finger on an opposite side of the ring finger, and the first standard point;

applying an affine conversion to the palm image so that coordinates of the first standard point and the second standard point are converted into predetermined coordinates;

collating the palm image after the applying and an enrolled feature; and

outputting a result of the collating,

wherein the first standard point is a midpoint of the base point of the middle finger on the ring finger side and the base point of the ring finger on the middle finger side, an intersection point of a straight line passing through the two base points of the middle finger and a straight line passing through the two base points of the ring finger, or an intersection point of a straight line passing through the base point of the index finger on the middle finger side and the base point of the middle finger on the ring finger side and a straight line passing through the base point of the little finger on the ring finger side and the base point of the ring finger on the middle finger.

3. The image processing device as claimed in claim 2 , wherein:

in the detecting, base points of a first finger and base points of a second finger next to the first finger are detected from the palm image;

in the calculating of the second standard point, a second reference point is calculated on a bisector of an angle that is formed by a straight line passing through a first reference point between a base point of the first finger on the second finger side and a base point of the second finger on the first finger side and a base point of the first finger on an opposite side of the second finger and a straight line passing through a base point of the second finger on an opposite side of the first finger, and the first reference point; and

in the applying an affine conversion to, the affine conversion is applied to the palm image so that coordinates of the first standard point, the second standard point and the second reference point are converted into predetermined coordinates.

4. An image processing method comprising:

capturing a palm image by a biometric sensor;

detecting two base points of both sides of a first finger and two base points of both sides of a second finger next to the first finger from the palm image, the two base points of the second finger not being overlapped with the two base points of the first finger;

calculating a first standard point between one of the base points of the first finger on the second finger side and one of the base point of the second finger on the first finger side with use of a position of the base point of the first finger on the second finger side and a position of the base point of the second finger on the first finger side;

calculating a second standard point on a bisector of an angle that is formed by a straight line passing through one of the base point of the first finger on an opposite side of the second finger and the first standard point and a straight line passing through one of the base point of the second finger on an opposite side of the first finger, and the first standard point;

applying an affine conversion to the palm image so that coordinates of the first standard point and the second standard point are converted into predetermined coordinates;

collating the palm image after the applying and an enrolled feature; and

outputting a result of the collating,

wherein the first standard point is a midpoint of the base point of the first finger on the second finger side and the base point of the second finger on the first finger side or an intersection point of a straight line passing through the two base points of the first finger and a straight line passing through the two base points of the second finger.

5. An image processing method comprising:

capturing a palm image by a biometric sensor;

detecting two base points of both sides of a middle finger, two base points of both sides of a ring finger, a base point of an index finger on a thumb side, and a base point of a little finger on an opposite side of the ring finger, the two base points of the ring finger not being overlapped with the two base points of the middle finger;

calculating a first standard point between one of the base points of the middle finger on the ring finger side and one of the base points of the ring finger on the middle finger side with use of a position of the base point of the middle finger on the ring finger side and a position of the base point of the ring finger on the middle finger side;

calculating a second standard point on a bisector of an angle that is formed by a straight line passing through one of the base points of the index finger on the thumb side and the first standard point, the base point of the little finger on an opposite side of the ring finger, and the first standard point;

applying an affine conversion to the palm image so that coordinates of the first standard point and the second standard point are converted into predetermined coordinates;

collating the palm image after the applying and an enrolled feature; and

outputting a result of the collating,

wherein the first standard point is a midpoint of the base point of the middle finger on the ring finger side and the base point of the ring finger on the middle finger side, an intersection point of a straight line passing through the two base points of the middle finger and a straight line passing through the two base points of the ring finger, or an intersection point of a straight line passing through the base point of the index finger on the middle finger side and the base point of the middle finger on the ring finger side and a straight line passing through the base point of the little finger on the ring finger side and the base point of the ring finger on the middle finger.

6. The image processing method as claimed in claim 5 , wherein:

in the detecting, base points of a first finger and base points of a second finger next to the first finger are detected from the palm image;

in the calculating of the second standard point, a second reference point is calculated on a bisector of an angle that is formed by a straight line passing through a first reference point between a base point of the first finger on the second finger side and a base point of the second finger on the first finger side and a base point of the first finger on an opposite side of the second finger and a straight line passing through a base point of the second finger on an opposite side of the first finger, and the first reference point; and

in the applying an affine conversion to, the affine conversion is applied to the palm image so that coordinates of the first standard point, the second standard point and the second reference point are converted into predetermined coordinates.

7. A computer readable, non-transitory medium storing a program that causes a computer to execute a process, the process comprising:

capturing a palm image by a biometric sensor;

detecting two base points of both sides of a first finger and two base points of both sides of a second finger next to the first finger from the palm image, the two base points of the second finger not being overlapped with the two base points of the first finger;

calculating a first standard point between one of the base points of the first finger on the second finger side and one of the base points of the second finger on the first finger side with use of a position of the base point of the first finger on the second finger side and a position of the base point of the second finger on the first finger side;

calculating a second standard point on a bisector of an angle that is formed by a straight line passing through a base point of the first finger on an opposite side of the second finger and the first standard point and a straight line passing through one of the base points of the second finger on an opposite side of the first finger, and the first standard point;

applying an affine conversion to the palm image so that coordinates of the first standard point and the second standard point are converted into predetermined coordinates;

collating the palm image after the applying and an enrolled feature; and

outputting a result of the collating,

wherein the first standard point is a midpoint of the base point of the first finger on the second finger side and the base point of the second finger on the first firmer side or an intersection point of a straight line passing through the two base points of the first firmer and a straight line passing through the two base points of the second finger.

8. A computer readable, non-transitory medium storing a program that causes a computer to execute a process, the process comprising:

capturing a palm image by a biometric sensor;

detecting two base points of both sides of a middle finger, two base points of both sides of a ring finger, a base point of an index finger on a thumb side, and a base point of a little finger on an opposite side of the ring finger, the two base points of the ring finger not being overlapped with the two base points of the middle finger;

calculating a first standard point between one of the base points of the middle finger on the ring finger side and one of the base points of the ring finger on the middle finger side with use of a position of the base point of the middle finger on the ring finger side and a position of the base point of the ring finger on the middle finger side;

calculating a second standard point on a bisector of an angle that is formed by a straight line passing through one of the base points of the index finger on the thumb side and the first standard point and a straight line passing through the base point of the little finger on an opposite side of the ring finger, and the first standard point;

applying an affine conversion to the palm image so that coordinates of the first standard point and the second standard point are converted into predetermined coordinates;

collating the palm image after the applying and an enrolled feature; and

outputting a result of the collating,

wherein the first standard point is a midpoint of the base point of the middle finger on the ring finger side and the base point of the ring finger on the middle finger side, an intersection point of a straight line passing through the two base points of the middle finger and a straight line passing through the two base points of the ring finger, or an intersection point of a straight line passing through the base point of the index finger on the middle finger side and the base point of the middle finger on the ring finger side and a straight line passing through the base point of the little finger on the ring finger side and the base point of the ring finger on the middle finger.

9. The medium as claimed in claim 8 , wherein:

in the detecting, base points of a first finger and base points of a second finger next to the first finger are detected from the palm image;

in the calculating of the second standard point, a second reference point is calculated on a bisector of an angle that is formed by a straight line passing through a first reference point between a base point of the first finger on the second finger side and a base point of the second finger on the first finger side and a base point of the first finger on an opposite side of the second finger and a straight line passing through a base point of the second finger on an opposite side of the first finger, and the first reference point; and

in the applying of the affine conversion, the affine conversion is applied to the palm image so that coordinates of the first standard point, the second standard point and the second reference point are converted into predetermined coordinates.