JPH08315143A - Fingerprint collation device - Google Patents

Abstract

PURPOSE: To obtain a fingerprint collation device which can collate the fingerprints of plural fingers at the same time without providing plural fingerprint read parts. CONSTITUTION: The fingerprint collation device is equipped with a fingerprint reader 1 having optical elements 2a and 2b which are formed out of bundles of optical fibers by thermal fusion and transmit optical images of fingerprints placed on slanting end surfaces to the opposite end surface sides through electronic shutters 3a and 3b, an optical lens 4 which is placed in contact with the other end surface side of the optical elements 2a and 2b and converges the optical images transmitted by the optical elements 2a and 2b, an image pickup element 5 which picks up the optical images passed through the optical lens 4, a light source 6 which irradiates the slanting end surfaces of the optical elements 2a and 2b with luminous flux uniformly under total reflection conditions through the optical lens 4, and an image processing circuit 7 which controls the power supply to the light source 6 and controls the alternate switching of the electronic shutters 3a and 3b to be opened in order to obtain recognition images of plural fingerprints obtained by the image pickup element 5, and the recognition images of the fingerprints read by this fingerprint reader 1 are collated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fingerprint collation device for reading a fingerprint and collating the read fingerprint with a registered fingerprint.

[0002]

2. Description of the Related Art Conventionally, by placing one finger on a fingerprint sensor, a concavo-convex pattern of a fingerprint is read, and the read fingerprint information is collated with already registered fingerprint information to identify the person himself / herself. There is a fingerprint matching device that identifies. In such a fingerprint collation device, it is conceivable to lower the collation accuracy determination level in order to speed up the collation operation and increase the collation rate, but in such a case, there is a possibility of misidentifying it as a fingerprint of another person. Will increase. Therefore, it is possible to match two or more fingers,
In such a case, the collation accuracy can be improved even if the determination level of the collation accuracy is lowered, and therefore, the probability of misidentification with another person also decreases.

[0003]

However, in order to perform fingerprint collation of a plurality of fingers, it is necessary to place the fingers on the fingerprint sensor in sequence and collate them one by one, and the collating operation is troublesome. It was a thing. Further, it is conceivable to equip the fingerprint sensors as many as the number of collating fingers to collate a plurality of fingers at the same time, but in this case, there is a problem that the number of parts constituting the apparatus increases.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a fingerprint collation device capable of simultaneously performing fingerprint collation of a plurality of fingers without providing a plurality of fingerprint reading units. I am trying.

[0005]

A fingerprint collating apparatus according to the present invention is a fingerprint collating apparatus in which a bundle of optical fibers are heat-sealed and an optical image of a plurality of fingerprints placed on an inclined end face is respectively passed through an electronic shutter to the other end face. Side optical elements, an optical lens closely arranged on the other end surface side of these optical elements for condensing an optical image by the optical elements, and an imaging element for capturing an optical image through the optical lenses. And a light source for uniformly irradiating the inclined end surface of each of the optical elements with a light flux through the optical lens under total reflection conditions, and controlling power supply to the light source, and further including any one of the plurality of electronic shutters. A fingerprint reader having an image processing circuit for controlling the switching to open one of them sequentially to obtain a recognition image of a plurality of fingerprints by the imaging device is provided, and a finger read by the fingerprint reader. It is characterized in that matching of the recognition image.

Data processing means for performing feature extraction and parameterizing based on a fingerprint recognition image obtained from the fingerprint reading device, which is connected to the fingerprint reading device via a connection cable, and communicates with the data processing means. It is characterized in that it is provided with a collation unit which is connected through a line and collates a registrant's fingerprint based on a parameter sent from the data processing unit.

[0007]

In the fingerprint collation device according to the present invention, a plurality of optical images of fingerprints, which are formed by heat-sealing a bundle of optical fibers and placed on the inclined end face, are transmitted to the other end face side through electronic shutters. An optical element, an optical lens closely arranged on the other end surface side of these optical elements for condensing an optical image by the optical element, an imaging element for capturing an optical image through the optical lens, and the optical lens A light source for uniformly irradiating the inclined end face of each of the optical elements with a light flux under the condition of total reflection, and power supply to the light source are controlled, and one of the plurality of electronic shutters is sequentially opened. In order to achieve this, an image processing circuit that controls the switching alternately to obtain a recognition image of a plurality of fingerprints by the above-mentioned image sensor can significantly reduce the size of the fingerprint reading device, and at the same time, reduce the size of the image due to dust and the like. Can be prevented deterioration, also allows reading multiple fingerprints at the same time.

Data processing means for performing feature extraction and parameterization based on a fingerprint recognition image obtained from the fingerprint reading device, which is connected to the fingerprint reading device via a connection cable, and communicates with the data processing means. By providing the collation means for performing fingerprint collation of the registrant based on the parameter transmitted from the data processing means connected through the line, the collation means placed at a remote place through the communication line By performing fingerprint collation, it is possible to prevent falsification of registrant data.

[0009]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram illustrating a fingerprint reading device portion of the fingerprint collation device according to the first embodiment. In FIG. 1, reference numeral 1 is a fingerprint reading device capable of simultaneously reading a plurality of fingerprints. This fingerprint reading device 1 is an image transmission system in which a bundle of optical fibers is heat-fused and an optical image of one side is accurately transmitted to the other side. Optical elements 2a and 2b having a function, and electronic shutters 3a and 3b inserted in the respective optical elements 2a and 2b
An optical lens 4 for condensing an optical image by the two optical elements 2a and 2b, an image pickup element 5 such as a CCD for picking up an optical image through the optical lens 4, and the optical lens 4 Image processing for obtaining a recognition image by the image pickup device 5 by controlling the light source 6 that illuminates the optical elements 2a and 2b and the power supply to the light source 6 and the opening / closing switching of the electronic shutters 3a and 3b. Circuit 7
It has and. The image pickup device 5, the light source 6, and the image processing circuit 7 are mounted on the substrate 8, and the recognition image of the image processing circuit 7 is transmitted through the connection cable connected to the connection terminal 9 provided on the substrate 8. And is transmitted to a signal processing board described later.

In FIG. 1, at the time of fingerprint collation, the image processing circuit 7 constantly irradiates the light from the light source 6, and the light flux is totally reflected on the inclined surface which is one end surface of the optical elements 2a and 2b. When the thumb and the index finger are placed on the slopes of the optical elements 2a and 2b, a part of the irradiation light escapes through the finger at the mountain of the fingerprint, Since the portion becomes dark, the mountain portion of the fingerprint becomes dark and the valley portion becomes a bright fingerprint pattern, and the fingerprint pattern is accurately transmitted by the optical elements 2a and 2b through the optical lens 4 closely attached to the other end face. It is adapted to be transmitted to the image sensor 5 and the image processing circuit 7.

When the thumb and forefinger are placed on the slopes of the optical elements 2a and 2b, the image processing circuit 7 causes the thumbs to fall on the slopes of the optical elements 2a and 2b due to the decrease in the light reflectance at that time. The image processing circuit 7 closes the electronic shutter 2a, opens the electronic shutter 2b, reads the fingerprint of the thumb, and then opens the electronic shutter 2a. ,
The fingerprint of the index finger is read by closing the electronic shutter 2b, and those fingerprint patterns can be obtained via the optical lens 4 and the image sensor 5.

Therefore, according to the above configuration, the optical element 2a
And 2b, the electronic shutters 3a and 3b, the optical lens 4, the image pickup device 5, and the light source 6 can be closely attached to each other, so that a large size reduction can be achieved and deterioration of an image due to adhesion of dust or the like can be prevented.

Next, FIG. 2 is a schematic configuration diagram showing the overall configuration of the fingerprint collation device. In FIG. 2, 10 is connected to the fingerprint reading device 1 via a connection cable 11 and has a signal processing board 10a for converting a fingerprint image signal obtained from the fingerprint reading device 1 into an internal signal form. A personal computer as a data processing means for parameterizing and extracting the characteristics by means of a personal computer, 20 is connected to the personal computer 10 through a communication line 21, and collates fingerprints of the registrant based on the parameters sent from the personal computer 10. A host computer as a means, and the host computer 20 communicates with the personal computer 10 through a communication line 21.
It is provided at a remote location via the so as to prevent the registrant from falsifying the registration data.

In the above structure, the fingerprint image signal obtained from the fingerprint reader 1 is converted into the internal signal form by the signal processing board 10a of the personal computer 10, and then the personal computer 1 is processed.
Feature extraction is performed by 0 and is parameterized. Then, by being transmitted to the host computer 20 via the communication line 21, the host computer 20 collates the fingerprint of the registrant based on the transmitted parameters and is placed at a remote place via the communication line. By verifying the fingerprint of the registrant by the host computer 20, the tampering of the data of the registrant can be prevented.

In the above embodiment, the electronic shutters 3a and 3b are provided with the optical elements 2a and 2b so that the thumb and the index finger can be read at the same time. However, the present invention is not limited to this. Needless to say, it is possible to read more than one finger at the same time.

[0016]

As described above, according to the present invention, the optical images of a plurality of fingerprints, which are formed by heat-sealing a bundle of optical fibers and are placed on the inclined end face, are respectively transferred to the other end face side via the electronic shutter. A plurality of optical elements for transmitting, an optical lens closely arranged on the other end surface side of these optical elements for condensing an optical image by the optical elements, and an imaging element for capturing an optical image through the optical lenses, A light source for uniformly irradiating the inclined end face of each optical element with a light beam through the optical lens under total reflection conditions, and controlling power supply to the light source, and at least one of the plurality of electronic shutters. And the image processing circuit that obtains a recognition image of a plurality of fingerprints by the above-mentioned image sensor by alternately controlling the switching so that the fingerprint readers can be opened successively. Deterioration can be prevented, and there is an effect that can be read a plurality of fingerprints at the same time.

Data processing means for performing feature extraction and parameterizing based on a fingerprint recognition image obtained from the fingerprint reading device, which is connected to the fingerprint reading device via a connection cable, and communicates with the data processing means. By providing the collation means for performing fingerprint collation of the registrant based on the parameter transmitted from the data processing means connected through the line, the collation means placed at a remote place through the communication line By performing fingerprint verification, there is an effect that it is possible to prevent falsification of registrant data.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a fingerprint reading device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing an overall configuration of a fingerprint matching device according to an embodiment of the present invention.

[Explanation of symbols]

1 Fingerprint reader 2a, 2b Optical element, 3a, 3b
Electronic shutter, 4 optical lens, 5 image sensor, 6
Light source, 7 image processing circuit, 10 personal computer (data processing means), 11 connecting cable, 20 host computer (verifying means), 21 communication line.

Claims (2)

[Claims] 1. A plurality of optical elements which are obtained by heat-bonding a bundle of optical fibers and are transferred to the other end surface side through electronic shutters, respectively, of optical images of a plurality of fingerprints placed on the inclined end surface, and these optical elements. An optical lens which is closely arranged on the other end surface side to collect an optical image by the optical element, an image pickup element for picking up an optical image through the optical lens, and an optical lens for each of the optical elements through the optical lens. A light source that uniformly irradiates the inclined end face with a luminous flux under the condition of total reflection, and a power supply to this light source are controlled, and at the same time, switching is controlled alternately to sequentially open any one of the plurality of electronic shutters. And a fingerprint reading device having an image processing circuit for obtaining a recognition image of a plurality of fingerprints by the image pickup device, and collating the recognition image of the fingerprint read by the fingerprint reading device. Place. 2. Data processing means for performing feature extraction and parameterizing based on a fingerprint recognition image obtained from the fingerprint reading device, which is connected to the fingerprint reading device via a connection cable, and communicates with the data processing means. The fingerprint collation device according to claim 1, further comprising a collation unit that is connected through a line and collates a registrant's fingerprint based on a parameter sent from the data processing unit.