JP2874104B2 - Identity verification system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an identity verification system using two-stage fingerprint collation. The personal identification system uses a fingerprint collation device. Fingerprint collation uses the characteristic points of a finger for the collation, but the characteristic points cannot always be extracted in a constant state. Therefore, it is necessary to construct an identity verification system using the fingerprint collation device based on the characteristics of such feature points.

[0002]

2. Description of the Related Art FIG. 6 shows the configuration of an identity verification system using a conventional fingerprint matching device. In this system, when entering a certain room, the room entrant presents a finger to a sensor 82 provided at the entrance 80. Then, a fingerprint image is output from the sensor 82 and the fingerprint matching device 8
4 is transferred. Also, the person who presented the finger,
An identification number (ID number) is input from a numeric keypad (not shown) of the fingerprint matching device 84. On the other hand, the dictionary image for each person who is scheduled to enter the certain room has been transferred from the host computer 86 to the fingerprint collation device 84.

The fingerprint collating device 84 compares a fingerprint image with a dictionary image (performs pattern matching). If the coincidence of the characteristic points is obtained by a predetermined number or more of threshold values, the person is regarded as the person and an unlocking signal is sent to an unlocking device (not shown) at the entrance 80 to permit the entrant to enter the room.

[0004]

As described above, the conventional fingerprint collation apparatus performs the fingerprint collation, but the fingerprint image picked up at the time of entering the room is compared with the dictionary image used for the fingerprint collation. They do not always match. Feature points in a fingerprint image of a manual worker or an elderly person may differ from those in a dictionary image. Therefore, even if the person is himself, a match can be obtained by fingerprint matching with a fingerprint matching device. There is a disadvantage that entry into the room is not permitted.

SUMMARY OF THE INVENTION The present invention has been made in view of the above technical problems, and has as its object to provide an identity verification system that obtains as much fingerprint matching as possible and does not erroneously verify the identity of the user. And

[0006]

FIG. 1 is a block diagram showing the principle of the present invention. As shown in FIG. 1, the invention according to claim 1 provides an input fingerprint image when a comparison between an input fingerprint image from a fingerprint image input device and a dictionary image is obtained for a preset first threshold value. In the identity verification system for confirming the person who performed the authentication, the first fingerprint image input device 2
When provided in the first gate portion, connected to Ru said first fingerprint image input device input fingerprint image and the dictionary image by the value verification is predetermined than the first threshold and lower threshold from 2 And a first fingerprint matching device 4 that outputs an identification signal and a matching pass signal of a person who has input the input fingerprint image and sends a gate opening signal to the first gate unit, A second fingerprint matching device 6 _i (i = 1, 2,..., N) provided for each second gate unit
When being connected to the second fingerprint image input device 8 _i connected to the fingerprint identification device 6 _i of the second, to the each of the first said fingerprint collating unit 4 of the second fingerprint collation apparatus 6 _i Responsive to the identification signal and the verification pass signal output from the first fingerprint verification device 4 and corresponding to the second signal corresponding to the identification signal.
And collating permitting means 10 for sending a verification permission signal to the fingerprint identification device 6 _i provided in the matching permission signal the second fingerprint collation apparatus 6 _i which has received the connection is the second fingerprint image input device 8 when the matching between the input fingerprint image and the dictionary image from _i was obtained for the first predetermined value lower by the threshold than the threshold, sends a gate opening signal to a corresponding said second gate portion It is characterized by the following.

[0007]

In the first fingerprint matching device, when a match between the fingerprint image input from the fingerprint image input device and the dictionary image is obtained for a threshold value lower than the first threshold value by a predetermined value, the input is performed. An identification signal of the person who has input the fingerprint image and a verification pass signal are output, and a gate opening signal is sent to the first gate unit.

Then, when the verification is successful, the first gate unit is opened by the gate opening signal , and the person who has input the input fingerprint image passes through the first gate unit and receives the plurality of first fingerprint images .
The process proceeds to one of the two second gate sections. During this time, the first fingerprint identification device 4 sends an identification signal and matching pass signal against the matching permission unit 10. Checking authorization unit 10 transmits the matching permission signal to said second fingerprint collation apparatus 6 _i corresponding to the identification signal in response to the identification signal and the verification pass signal. The second fingerprint collation device 6 _{i that} has received the collation permission signal,
It predetermined value than matching said first threshold value with the input fingerprint image and the dictionary image from the second fingerprint image input device 8 _i
If a pass is obtained for a lower threshold , the corresponding
A gate opening signal is sent to the one second gate unit.

In the present invention, the first fingerprint collating device 4 performs fingerprint collation with the threshold lowered, and then, for those who pass the collation, the second fingerprint collating device 6 corresponding to the identification information.
Perform fingerprint matching with _i lowered the threshold, so verify
The feature points in the input fingerprint image differ from the feature points in the dictionary image.
The number of cases in which verification has passed has increased, and the fingerprint verification rate has increased.
There it improves. In addition, the first gate
Even if an incorrect fingerprint matching pass decision is made by the
In the second gate section, the second gate specified by the identification signal
Only by lowering the threshold value of the second part,
Does not lower the threshold, and the second specified by the identification signal
In the gate unit, fingerprint collation is performed again , so that the danger of causing a person other than the entry target to enter a predetermined place due to the incorrect fingerprint collation can be eliminated as much as possible.

[0010]

2 to 5 show one embodiment of the present invention.
FIG. 2 shows a configuration of the main gate unit 20, and FIG. 3 shows a configuration of the entrance entrance 40. FIG. 4 and FIG. 5 are processing flows showing the flow of the operation of the personal identification system constituted by FIG. 2 and FIG.

Referring to FIG. 2, the main gate section 20 comprises an entry participant input section 22 and a main gate fingerprint collation device 24. Reference numeral 50 denotes a host computer. The occupant input unit 22 includes a numeric keypad 26 and a sensor 28. The main gate fingerprint matching device 24 includes a dictionary memory 30, a data comparison circuit 32, and a CPU. Numeric keypad 26
Is used by the entrant presented to the sensor 28 to input an identification number (ID number). In the dictionary memory 30,
Dictionary images (feature points) are registered in advance according to a known method. The data comparison circuit 32 compares the input fingerprint image with the dictionary image for a predetermined threshold. The threshold value is set to a value lower by a predetermined value than the threshold value used in the conventional fingerprint matching device described in FIG.

In FIG. 3, there are a plurality of entry-entry sections 40, and an entry-entry input section 62 and an entry-entry fingerprint verification device 64 are provided for each entry-entry section 40. However, each reference number does not have a suffix representing a plurality, but will be referred to with a suffix as necessary below. Reference numeral 50 denotes a host computer. The resident input unit 62 includes a numeric keypad 66 and a sensor 68. The entry person fingerprint collation device 64 includes a dictionary memory 70, a data comparison circuit 72,
And a CPU 74. The numeric keypad 66 is connected to the sensor 6
8 is used to input an identification number (ID number). Dictionary images (feature points) are registered in the dictionary memory 70 in advance according to a known method. The data comparison circuit 72 compares the input fingerprint image with the dictionary image for a predetermined threshold. The threshold value is set to a value lower by a predetermined value than the threshold value used in the conventional fingerprint matching device described in FIG. The threshold values of the data comparison circuit 32 and the data comparison circuit 72 are set substantially the same, but may be set differently.

In FIGS. 2 and 3, the sensor 28 is
The main gate fingerprint matching device 24 corresponds to the fingerprint image input device 2 in FIG. 1 and the first fingerprint matching device 4 in FIG. Sensor 68 corresponds to the fingerprint image input device 8 _i in FIG. 1, entrant inlet fingerprint collation device 64 corresponds to the second fingerprint collation apparatus 6 _i in FIG. Host computer 50
Corresponds to the matching permission means 10 in FIG.

The operation of the personal identification system having the above configuration will be described below. When this system is put into operation, the main gate unit 20 waits for the entry of the occupant ID number (see NO in S1 of FIG. 4). When an entrant inputs the ID number (see YES in S1 of FIG. 4), the CPU 34
Stores the dictionary image corresponding to the ID number in the dictionary memory 30
And supplies it to the data comparison circuit 32.

Then, it is determined whether or not a finger has been presented by the room entrant (see S3 in FIG. 4). When the finger is presented (see YES in S3 in FIG. 4), a fingerprint image of the finger is made. Is captured, and the fingerprint image is compared with the dictionary image (see S5 in FIG. 4).

If the collation does not pass (see NO in S6 of FIG. 4), the collation processing is terminated. If the verification is successful (YES in S6 in FIG. 4), the main gate is unlocked (S7 in FIG. 4), and the ID number and the pass notification are stored in C.
Transfer from PU 34 to host computer 50 (FIG. 4)
S8)).

[0017] The host computer 50 communicates with the entry participant entrance 40 _i (i is 1, 2, 2) corresponding to the received ID number.
.., N. ) Is transferred (see S9 in FIG. 5).

[0018] a determination is made as to whether or not the in entrant inlet 40 _i receiving the transfer of the verification enable signal, or the presentation of the finger by proceeding to the entrant inlet 40 _i the entrant is made (FIG. 5 (see S10 in FIG. 5), when there is a presentation (see S10 in FIG. 5), a fingerprint image of the finger is captured, and the fingerprint image is compared with the dictionary image (see S11 in FIG. 5).

If the collation does not pass (S13 in FIG. 5)
No), the collating process is terminated. If the verification is successful (see S13 in FIG. 5), an unlocking signal is sent to a locking device provided at the entrance of the occupant to unlock the locking device (see S14 in FIG. 5).

As described above, since the threshold value of the data comparison circuit 32 is set to a value lower than the conventional value, even if the characteristic point of the fingerprint image is not clear, the main gate can be unlocked. I do. Therefore, in the conventional device, even if the fingerprint cannot be collated in the main gate unit 20, the probability of successful fingerprint collation is improved by the lower threshold of the data comparison circuit 32.

By relaxing the pass condition of the fingerprint collation in this way, even if the person who has passed through the main gate unit 20 can re-enter the fingerprint collation device of the entrance 40 with the same ID number again. Since the fingerprint collation is performed, the accuracy of the personal identification can be improved. Therefore, as described above, it is possible to greatly reduce the chance that the person will enter the room due to erroneous fingerprint matching due to loosening the fingerprint matching pass condition.

In this process, the process for the room entrant ends, and the process returns to step S1, which is the initial state of the system operation.

[0023]

As described above, according to the present invention ,
The first fingerprint matching device performs fingerprint matching with the threshold lowered, and for those who pass the matching, the second fingerprint matching device corresponding to the identification information performs fingerprint matching with the threshold lowered. Therefore, it is possible to improve the fingerprint collation rate, and to eliminate as much as possible the risk that a person other than the entry target due to erroneous fingerprint collation may enter a predetermined place. That is, according to the present invention, the security of the entire system is
Facilitates the passage of specific people while securing the tee level
You.

[Brief description of the drawings]

FIG. 1 is a principle block diagram of the present invention.

FIG. 2 is a diagram showing a configuration of a main gate unit.

FIG. 3 is a diagram showing a configuration of a room entrance.

FIG. 4 is a diagram showing a part of a processing flow of the personal identification system.

FIG. 5 is a diagram showing the rest of the processing flow of the personal identification system.

FIG. 6 is a diagram showing a configuration of a conventional fingerprint matching device.

[Explanation of symbols]

2 Fingerprint Image Input Device 4 First Fingerprint Verification Device 6 _i Second Fingerprint Verification Device 8 _i Fingerprint Image Input Device 10 Verification Permitting Unit 24 Main Gate Fingerprint Verification Device 28 Sensor 50 Host Computer 68 Sensor 64 Entrance Fingerprint Verification Device

Claims (1)

(57) [Claims] 1. An identity verification system for identifying a person who has provided an input fingerprint image as an identity when collation between an input fingerprint image from a fingerprint image input device and a dictionary image is obtained for a preset first threshold value. in a first fingerprint image input device (2), provided on the first gate portion, the collation of the input fingerprint image and the dictionary image from the connected Ru said first fingerprint image input apparatus (2) when obtained for a predetermined value lower by the threshold than the first threshold value, and outputs an identification signal and verification pass signal person who has entered the input fingerprint image, the gate opening signal to the first gate portion And a second fingerprint matching device (6 _i ) (i = 1, 2,..., N) provided for each of the plurality of second gate units. , connected to the fingerprint identification device of said 2 (6 _i) And 2 the fingerprint image input device (8 _i), said first connected to a respective fingerprint identification device (4) and the second fingerprint identification device (6 _i), the first fingerprint identification device (4 ) In response to the identification signal and the verification pass signal output from the second fingerprint verification device (6 _i ) corresponding to the identification signal. The second fingerprint collation device (6 _i ), which has received the collation permission signal, performs collation between the input fingerprint image from the connected second fingerprint image input device (8 _i ) and the dictionary image with the first fingerprint image. when obtained for a predetermined value lower by the threshold than the threshold, the identification system, characterized by sending a gate opening signal to a corresponding said second gate portion.