Biometric information processing device and biometric information processing program

Abstract

Provided is a small-sized, flat, vein authentication device of high authentication accuracy by photographing a living body several times and thus obtaining as registration data plural images that are picked up at different positions. A biometric information processing device of this invention comprising an image pickup device, which picks up a vein image, an image computing unit, which processes the vein image picked up by the image pickup device, an interface on which a part of a living body to be picked up is placed, and a light source, which emits infrared light. The biometric information processing device is further comprised of a sensor unit, which detects the presence or absence of a subject picked up by the image pickup device, a unit to obtain plural images as registration data, and a unit to select optimum registration data out of images obtained as registration data.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention can be appreciated by the description which follows in conjunction with the following figures, wherein:

FIG. 1 is a configuration diagram of an authentication system according to a first embodiment of this invention;

FIG. 2 is a block diagram of a memory in an authentication processing unit according to the first embodiment of this invention;

FIG. 3A is a plane view of an input device according to the first embodiment of this invention;

FIG. 3B is a plane view of an input device with a finger placed on the finger placing surface according to the first embodiment of this invention;

FIG. 4 is a side view of the input device according to the first embodiment of this invention;

FIG. 5 is a flow chart for registration processing of the authentication processing unit according to the first embodiment of this invention;

FIG. 6 is a flow chart for registration data selection processing of the authentication processing unit according to the first embodiment of this invention;

FIG. 7A and FIG. 7B are an explanatory diagrams of the registration data selection processing of the authentication processing unit according to the first embodiment of this invention;

FIG. 8A and FIG. 8B are an explanatory diagrams of the registration data selection processing of the authentication processing unit according to the first embodiment of this invention;

FIG. 9 is an explanatory diagram of the registration data selection processing of the authentication processing unit according to the first embodiment of this invention;

FIG. 10 is a flow chart for authentication processing of the authentication processing unit according to the first embodiment of this invention; and

FIG. 11 is a flow chart for registration processing of an authentication processing unit according to a second embodiment of this invention.

Claims

1. A biometric information processing device, comprising: a placement surface on which a part of a living body whose image is to be picked up is placed;a light source for irradiating the living body with light;a image pickup unit for picking up light that has been transmitted through the living body to obtain registration image candidates; anda processing unit for extracting blood vessel patterns from the picked up registration image candidates,wherein the processing unit calculates how large a position difference is between the blood vessel patterns extracted from the picked up images, selects a given number of blood vessel patterns where the position difference is large out of the picked up images, and determines the selected blood vessel patterns as registration patterns.

2. A biometric information processing device, comprising: an input unit for obtaining plural pickup images of a part of a living body; anda processing unit for extracting blood vessel patterns from the pickup images of a living body,wherein the processing unit compares a position difference between a first blood vessel pattern, which is obtained from a first of the pickup images, and a second blood pattern, which is obtained from a second of the pickup images, a position difference between the first blood vessel pattern, which is obtained from the first pickup image, and a third blood vessel pattern, which is obtained from a third of the pickup images, and a position difference between the second blood vessel pattern, which is obtained from the second pickup image, and the third blood vessel pattern, which is obtained from the third pickup image, against one another, and registers two of the blood vessel patterns where the position difference is largest as a registration pattern for authentication.

3. The biometric information processing device according to claim 1, further comprising a sensor unit for detecting whether the part of the living body is placed on the placement surface or not, wherein the sensor unit detects whether or not the living body has been lifted from the placement surface after the last registration image candidate is picked up, andwherein the processing unit determines, as a new registration image candidate, an image obtained by picking up light that has been transmitted through the living body placed again after it is judged that the living body is lifted from the placement surface.

4. The biometric information processing device according to claim 1, wherein the processing unit judges whether or not the position of a blood vessel pattern extracted from a picked up image is shifted from the position of a blood vessel pattern extracted from a registration image candidate that is picked up last time, and when it is judged that there is a position difference between the blood vessel patterns, the blood vessel pattern extracted from the recent pickup image is determined as a new registration image candidate.

5. A biometric information processing device, comprising: a placement surface on which a part of a living body whose image is to be picked up is placed;a light source for irradiating the living body with light;a image pickup unit for picking up light that has been transmitted through the living body to obtain registration image candidates; anda processing unit for extracting blood vessel patterns from the picked up registration image candidates, and registering the extracted blood vessel patterns as registration patterns,wherein the processing unit detects whether or not the living body is lifted from the placement surface after the registration image candidates are obtained, and determines registration patterns from the registration image candidates picked up by the image pickup unit after the part of the living body is placed on the placement surface again.

6. The biometric information processing device according to claim 5, wherein the processing unit further calculates a position difference value between the blood vessel patterns extracted from the registration image candidates, and selects the blood vessel patterns where the blood vessel pattern position difference is largest as the registration patterns.

7. The biometric information processing device according claim 1, wherein the part of the living body is a finger.

8. The biometric information processing device according to claim 7, wherein the position difference value is a position difference value in the longitudinal direction of the finger.

9. The biometric information processing device according to claim 3, wherein the processing unit instructs to place the part of the living body on the placement surface again after the registration image candidates are obtained.

10. The biometric information processing device according to claim 1, wherein the processing unit selects, out of the blood vessel patterns extracted from the registration image candidates, a pair of blood patterns that are farthest from each other than from any of the rest of the blood vessel patterns, and a blood vessel pattern that is closest to a middle point between the pair of blood vessel patterns, and determines the selected three blood vessel patterns as the registration patterns.

11. The biometric information processing device according to claim 1, wherein the processing unit performs individual authentication by checking a blood vessel pattern that is extracted from a newly picked up image of a living body against each of the plural registration patterns.

12. A machine-readable medium, containing at least one sequence of instructions that, when executed, causes a biometric information processing device to: irradiate a living body that is placed on a device with light;pick up light that has been transmitted through the living body to obtain plural pickup images;extract blood vessel patterns from the plural pickup images;calculate an amount of position difference between the plural pickup images using the blood vessel patterns;select a given number of blood vessel patterns that make the position difference amount large;determine the selected blood patterns as registration data which is used for individual authentication; andrecord the determined registration data.

13. A machine-readable medium, containing at least one sequence of instructions that, when executed, causes a biometric information processing device to: irradiate a part of a living body that is placed on a device with light;pick up light that has been transmitted through the living body to obtain a pickup image;detect that the living body has been lifted from the device and then placed on the device again after the pickup image is obtained;pick up light that has been transmitted through the living body after the detection to obtain a new pickup image;extract blood vessel patterns from the plural pickup images; andrecord the blood vessel patterns as registration data which is used for individual authentication.

14. The machine-readable medium, containing at least one sequence of instructions according to claim 12, wherein, in obtaining the pickup image, a new pickup image is obtained after it is judged that the living body has been lifted from the device.

15. The machine-readable medium, containing at least one sequence of instructions according to claim 12, wherein, in obtaining the pickup image, a new pickup image is obtained after it is judged that the position of the living body placed on the device has been shifted.