JPH01217574A - Device for collating principal - Google Patents

Abstract

PURPOSE:To execute collation by decreasing an image pick-up number and to shorten a collating time by continuously image picking-up plural fingerprint pictures, storing the picture and discriminating whether a finger is moved in correspondence to the picture information of the image picked-up fingerprint, and outputting a message when the finger is moved. CONSTITUTION:A person to desire the entrance of a room puts a finger, which is registered in advance, to an input part and the value of a counter N stored in a word memory 15 is set to the image pick-up number which is determined N advance by a CPU 1. Then, the area number of a picture memory 13 is set to '0'. Next, the image pick-up of the fingerprint is executed by a TV camera 18 is executed only by a number to be set to the counter N. Then, picture information are stored in a first area FP0 of the memory 13. Continuously, the counter N is successively caused to be + or -1 and stored next area FP1-FPN-1. The picture information of the fingerprint stored in the memory 13 are read to a successive collating part 17. Then, whether the finger is moved or not is discriminated and according to a discriminated result, the message that the finger is operated is outputted.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a person verification device that can verify a person using a fingerprint. Regarding a personal identification device that can be used.

[Prior Art and Problems to be Solved by the Invention] A person verification device that verifies a person using a fingerprint is disclosed in, for example, Japanese Patent Laid-Open No. 61-255638 and Japanese Patent Laid-Open No. 61-25.
It is known from Publication No. 5639. In these conventional personal identification devices, the density distribution of a fingerprint image is determined, and accordingly, a sound or a light emitting device is used to guide the person entering the fingerprint as to whether or not the finger has been placed in the correct manner. However, conventional identity verification devices simply tell you whether the image is good or not, but if a good image is not obtained, there is no guidance as to why a good image was not obtained.
The fingerprint input person does not know how to obtain a good image, so no matter how many times he tries, he may not be able to obtain a good image.

Therefore, the main purpose of this invention is to solve the above-mentioned problem by outputting a message to the effect that the finger has moved when a good image cannot be obtained due to the finger movement. The purpose of the present invention is to provide such a personal identification device.

[Means for Solving the Problem] FIG. 1 is a block diagram showing the configuration of the present invention,
In FIG. 1, the person verification device includes an imaging means 1 for successively capturing a plurality of fingerprint images, a storage means 2 for storing information about the plurality of fingerprint images captured by the imaging means 1, a determining means 3 for determining whether the finger has moved based on the plurality of fingerprint image information stored in the storing means 2; and in response to the determining means 3 determining that the finger has moved; Message output means 4 for outputting a message indicating that the finger has moved.

[Operation] The person verification device according to the present invention sequentially captures and stores a plurality of fingerprint image information, determines whether or not the finger has moved based on the captured images, and determines whether or not the finger has moved. outputs a message to that effect.

[Embodiment of the Invention] A person verification device according to an embodiment of the present invention verifies the identity of the person by comparing fingerprints. For example, when this personal verification device is used for room entry control,
The fingerprints of those who are allowed to enter the room are registered in advance. When a person wishing to enter the room places a predetermined finger on the input section of the verification device, verification is performed, and entry is permitted only when the fingerprint matches the registered fingerprint.

FIG. 2 is a schematic block diagram showing the electrical configuration of an embodiment of the present invention, and FIG. 3 is a diagram showing the configuration of the image memory shown in FIG. 2. Next, the configuration of an embodiment of the present invention will be described with reference to FIGS. 2 and 3. The person verification device is provided with a CPU 1l. The CPU II includes an image input circuit 121, an image memory 13. Program memory 14, work memory 15. A liquid crystal display 16 and a verification section 17 are connected. The image input circuit 12 divides the fingerprint image into pixels, converts the shading into binary information, and sends it to the CPU.
II, and is connected to a television camera 18 as an imaging means.

The image memory 13 is for storing fingerprint image information, and has N areas (FP
o to FPN-1).

Here, the reason why multiple images are continuously captured is to detect the movement of the images based on the multiple images and to determine that the finger did not move or move during verification. It is.

The program memory 14 stores the operating program of the CPU 11 based on a flow diagram as explained later in FIG. The liquid crystal display 16 is for displaying a message etc. to the person whose fingerprint is to be verified.A CRT display device or any other display device may be used instead of the liquid crystal display 16 as the message output means. You can also
The message may be notified by voice. The verification unit 17 is for comparing the fingerprint registered in advance with the captured fingerprint to determine whether or not the person is the real person.

FIG. 4 is a diagram for explaining fingerprint image processing, and in particular, FIG. 4(a) is a diagram showing a fingerprint image taken by the television camera 18, and FIG. FIG. 4(c) is a diagram showing the image after processing, and FIG. 4(c) is a diagram for explaining the calculation process of the amount of image movement.

FIG. 5 is a diagram for explaining the operation of an embodiment of the present invention. Next, the operation of one embodiment of the present invention will be described with reference to FIGS. 2 to 5.

For example, a person who wishes to enter the room places the same finger as the one registered in advance on an input unit (not shown). Accordingly, the CPU
II sets, for example, the value of a counter (N) stored in the work memory 15 to a predetermined number of times of imaging, and also sets the area number (i) of the image memory 13 to 0.

Subsequently, imaging is performed the number of times set in the counter (N). That is, a fingerprint is imaged, the image information is stored in the i-th area FPi of the image memory 13, and then,
The memory area number (i) is incremented by 1, and then the counter (N) is incremented by -1. Repeat this operation N times and count the counter (
When the value of N) becomes 0, all image information stored in the image memory 13 is enlarged or reduced. This scaling process is a process performed to fill in the blank space between a line corresponding to a fingerprint streak and an adjacent line, and may be performed by hardware or software. Through this process, a filled-in image as shown in FIG. 4(b) is obtained based on the fingerprint image shown in FIG. 4(a). Next, 2 with consecutive numbers
Two images are superimposed, the amount of movement between each image is calculated, and the degree of non-overlapping (D) is calculated by accumulating them.

The movement distance between each image is, for example, as shown in FIG. 4(c), where the images do not overlap (shaded area in FIG. 4(C)).
This is done by counting the number of pixels. Subsequently, it is determined whether the degree of non-overlapping (D) is greater than or equal to a predetermined value (T). If the degree of non-overlapping (D) is smaller than the predetermined value (T), normal processing is performed.
For example, the matching section 17 performs matching processing. On the other hand, if the degree of non-overlapping (D) is greater than or equal to a predetermined value (T), for example, a message such as "Please do not move your fingers 1" is displayed on the liquid crystal display 16,
Subsequently, imaging is performed again as abnormality processing.

Note that in the above-described embodiment, the image is enlarged or reduced in order to fill in the gaps between the lines of the fingerprint and extract the outline of the image, but the present invention is not limited to this. Any method may be used as long as it is possible.

[Effects of the Invention] As described above, according to the present invention, a plurality of fingerprint images are continuously captured and stored, and it is determined whether or not the finger has moved based on the information of the plurality of captured images. If the finger moves, a message to that effect is output, so the person entering the fingerprint is careful not to move the finger, so verification can be performed with fewer images taken, reducing the time required for verification. can do.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention. Second
The figure is a schematic block diagram showing the electrical configuration of an embodiment of the present invention. FIG. 3 is a diagram showing the configuration of the image memory shown in FIG. 2. FIG. 4 is a diagram for explaining fingerprint image processing. FIG. 5 is a flow diagram for explaining the operation of one embodiment of the present invention. In the figure, 1 is an imaging means, 2 is a storage means, 3 is a discrimination means, 4 is a message output means, 11 is a CPU, 12 is an image input circuit, 13 is an image memory, 14 is a program memory, 15 is a work memory, 16 17 indicates a liquid crystal display, 17 indicates a collation unit, and 18 indicates a television camera.

Claims (1)

[Scope of Claims] A person verification device that verifies a person based on a fingerprint, comprising: an imaging means for successively taking a plurality of fingerprint images; and storing information on the plurality of fingerprint images taken by the imaging means. storage means for determining whether the finger has moved, based on the plurality of fingerprint image information stored in the storage means; and determination means for determining whether the finger has moved, based on the plurality of fingerprint image information stored in the storage means; and a message output means for outputting a message to the effect that a finger has moved in response to the user's finger movement.