JP2943337B2 - Fingerprint image input device with biometric identification function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a fingerprint image input device. In recent years, with the introduction of information systems into society, how to maintain the security of the system has become a problem. ID cards that have been used up to now may be lost or stolen as a means of identifying themselves when using information systems, and their passwords and other information can be easily inferred from information around them. It is pointed out. Therefore, fingerprints with the characteristics of "everyone is unidentified" and "lifelong invariant" are being considered as a means of identity verification instead of ID cards, and the development of simple personal verification devices using fingerprints has been promoted in various places. I have.

However, this personal verification device also has a problem in that the security is broken when an imitation fingerprint (replica) is used, and a fingerprint image input that captures a fingerprint image by confirming a fingerprint input from a living body. A device is needed.

[0003]

2. Description of the Related Art FIG. 9 is a block diagram of a conventional example, showing a fingerprint collating apparatus. In a fingerprint collation device, a fingerprint image input device for converting a fingerprint into image data is usually required to handle a fingerprint as an image. In FIG. 9, the finger 10 is brought into contact with the transparent flat plate 5 to illuminate the entire finger with the illumination light source 32, and the ridges (projections) of the fingerprint are obtained.
Of the scattered light of the portion, a component totally reflected at the interface of the transparent plate 5 is imaged on the image sensor CCD 8 by an optical system such as the hologram 6 and the lens 7, and the image is captured by the image capturing circuit 30, and the ridge is formed. The image data of the pattern is obtained.

The fingerprint image input in this way is registered in advance as dictionary information 31 for each individual,
9 performs identity verification by comparing the dictionary information 31 with the input image.

[0005]

If a replica having the same irregularities as the fingerprint registered in the fingerprint collation device is used, security may be broken.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a fingerprint image input device having a biometric identification function for determining whether a collated fingerprint is a person's thing or a replica.

[0007]

In the principle diagram of the present invention shown in FIG. 1, reference numeral 1 denotes a fingerprint sensor, which converts a fingerprint of a finger into a fingerprint image in real time. Reference numeral 22 denotes detection means for detecting the detection target 10 placed on the fingerprint sensor 1. Reference numeral 2 denotes a living body stimulating unit that applies a stimulus to the detection target 10 placed on the fingerprint sensor 1. 21 is a response detecting means for detecting a response from the living body. 3 is an image capturing circuit, which detects the living body
And if the response is not received within a predetermined time, the fingerprint image obtained from the fingerprint sensor 1 is invalidated.

[0008]

The image capturing circuit 3 which has detected that the detection object 10 has been placed on the fingerprint sensor 1 by the detection means 22 instructs the living body stimulating means 2 to stimulate the detection object 10. If there is no response from the living body to the stimulus within a predetermined time, the image capturing circuit 3 invalidates the fingerprint image obtained from the fingerprint sensor 1. As a result, it is possible to eliminate collation using a pseudo fingerprint having no sensory organ.

The stimulus to the living body includes heat rays, vibrations, electrical stimuli, and the like. The response may be responsive to a means conscious of the living body. May be detected.

[0010]

FIG. 2 is a block diagram of one embodiment, FIG. 3 is a time chart of the embodiment, FIG. 4 is a diagram showing a response example by voice, FIG. 5 is a diagram showing a response example from a keyboard, and FIG. FIG. 7 is a diagram illustrating an example of stimulation by a vibration element, FIG. 7 is a diagram illustrating an example of stimulation by electric pulses, and FIG. 8 is a time chart of FIG.

In the embodiment shown in FIG. 2, a finger (corresponding to the object to be detected 10 and using the same reference numeral) is stimulated by a heat ray, and when a user (living body) feels heat on the finger 10, An example of responding by pressing the transparent flat plate 5 more strongly is shown.

In FIG. 1, reference numeral 11 denotes a heat ray light source (corresponding to the biological stimulating means 22), which radiates infrared rays in a spot shape. Reference numeral 12 denotes a pressure sensor (corresponding to the detecting means 22 and the response detecting means 21), which is provided between the transparent flat plate 5 and a support for the transparent flat plate 5, not shown, and detects the pressing force of the finger 10. Reference numeral 3 denotes an image capturing circuit (including a part of the response detecting means 21), which detects a contact of the finger 10 based on a change in the output of the pressure sensor 12, and instructs the heat ray light source 11 to emit heat rays. When the pressing force further increases, image data is taken in from the image sensor CCD 8. Others
The same reference numerals represent the same objects throughout the drawings.

In the above configuration, the following fetch process is performed. When the finger 10 of FIG. 3 is brought into contact with the transparent flat plate 5, the output of the pressure sensor 12 changes as shown in FIG. The image capturing circuit 3 that has detected this change determines that the finger 10 has come into contact, and instructs the heat ray light source 11 to emit heat rays, and the heat ray light source 11 emits an infrared spot to irradiate the finger 10. As a result, when the user who feels the heat of the finger 10 strongly presses the transparent flat plate 5, a change occurs in the output of the pressure sensor 12, and the image capturing circuit 3 that detects the change captures the fingerprint image from the CCD 8. Then, if there is no response after the elapse of the predetermined time, the acquisition is not performed. As for the timing of capturing the fingerprint image, the fingerprint image is captured by contact detection,
It may be valid when a response is detected within a predetermined time, and invalidate the captured fingerprint image when there is no response. (Figure 3
In the above, an example in which the pressing force is used as the response detection means 21 and the heat ray is used as the living body stimulating means 20 has been described. is there.

FIG. 4 shows a voice input device 13 and a voice identification device 14.
When a stimulus is felt, a response is made by voice. The voice identification device 14 notifies the image capturing circuit 3 as response detection by a predetermined encryption input or the like.

FIG. 5 shows a case in which a response is made from the keyboard 15. When a stimulus instruction is received from the image capturing circuit 3, the irradiation pattern control unit 16 transmits a predetermined irradiation pattern, for example, three times of heat radiation to a heat ray light source. The user instructs 11 and feels the heat ray three times, and inputs “3” from the keyboard 15. When the response matches the irradiation pattern, it is determined that a response has been detected.

As other living body stimulating means 20, there are a method of applying vibration to the finger 10 and a method of applying electric stimulation. FIG. 6 shows a method in which the vibration element 17 is provided on the transparent flat plate 5 and when the contact of the finger is detected, the vibration element 17 is driven to stimulate the finger 10 to vibrate.

FIG. 7 shows a method of providing an electrode 18 at a position where a finger is to be placed, and applying an electric pulse to the electrode 18 to apply an electric stimulus to the finger 10. This stimulated finger 10
As shown in FIG. 8, since the finger 10 is moved conditionally and reflexively, this change is detected by the pressure sensor 12 and a fingerprint image is captured. FIG. 8 is a time chart thereof.

The above-described biological stimulating means 20 and response detecting means 21
Can be used in combination with each other, and it is needless to say that the present invention is not limited to the embodiments. The response from the living body is one time, and the allowable value of the time lag from receiving the stimulus to responding is 0.5 to 1 second.

In the above embodiment, the capture of the fingerprint image is started after the detection of the response. However, the fingerprint image is captured from the time of the contact detection or the start of the stimulus. Of course, invalidity may be determined. Further, it is needless to say that validity / invalidity may be determined based on presence / absence of a response when matching and matching are performed.

As described above, a certain stimulus is given to the finger 10, and the validity / invalidity of the fingerprint image obtained from the fingerprint sensor 1 is determined based on the response from the living body to which the stimulus is applied.
Collation by a replica or the like can be avoided.

[0021]

As described above, according to the present invention, a finger is stimulated and a response of the finger is used to avoid collation of the imitation fingerprint, thereby providing an effect of improving security. Especially,
(1) By borrowing a human (user) sensing system, judgment system, and response system, biometric identification can be performed without using a complicated sensor system. (2) Since the user's condition-reflexive response can be used, it is very difficult to perform verification using a forged fingerprint in response time to a stimulus. (3) By registering the reaction time of each user to the stimulus to the finger at the time of registration and having it as individual data, it is possible to make it more difficult to collate a forged fingerprint. (4) When a user's utterance is used as a user's response to a stimulus to a finger, security is improved by using the voice and performing voice recognition in combination.

[Brief description of the drawings]

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

FIG. 2 is a configuration diagram of an embodiment.

FIG. 3 is a time chart of the embodiment.

FIG. 4 is a diagram showing a response example by voice

FIG. 5 is a diagram showing a response example from a keyboard.

FIG. 6 is a diagram showing an example of stimulation by a vibrating element.

FIG. 7 is a diagram showing an example of stimulation by electric pulses.

FIG. 8 is a time chart of FIG. 7;

FIG. 9 is a configuration diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fingerprint sensor 3 Image capture circuit 5 Transparent flat plate 6 Hologram 7 Lens 8 Image sensor CCD 9 Collation part 10 Finger, object to be detected 11 Heat ray light source 12 Pressure sensor 13 Voice input device 14 Voice identification device 15 Keyboard 16 Irradiation pattern control circuit 17 Vibration Element 18 Electrode 20 Biological stimulation means 21 Response detection means 22 Detection means

Continuation of front page (56) References JP-A-62-3384 (JP, A) JP-A-62-74173 (JP, A) JP-A-2-1243 (JP, A) JP-A-2-5190 (JP, A) JP-A-2-110780 (JP, A) JP-A-2-133892 (JP, A) JP-A-2-144885 (JP, A) JP-A-2-259969 (JP, A) 10-290796 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G06T 1/00

Claims (1)

(57) [Claims] 1. A fingerprint sensor (1) for converting a fingerprint of a finger into a fingerprint image, detection means (22) for detecting an object placed on the fingerprint sensor, living body stimulating means (20), Response detecting means (21) for detecting a response from the image sensor, and an image capturing circuit (3) .The living body stimulating means (2) includes a detection object (10) placed on the fingerprint sensor (1). The image capturing circuit (3) is provided with a detection object (1) by the detection means (22).
(0) is detected, the stimulating operation is instructed to the living body stimulating means (2), and if a response from the living body is not detected within a predetermined time, a fingerprint image obtained from the fingerprint sensor is invalidated. And a stimulus is given to a detection target placed on the fingerprint sensor, and a fingerprint image obtained from the fingerprint sensor in response to the stimulus is targeted for processing. apparatus.