JP3425787B2 - Collation device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information processing technique using spatial Fourier transform in pattern recognition and the like.

[0002]

2. Description of the Related Art Since pattern recognition can be used to identify an individual, for example, a collation device has been conventionally developed which utilizes a fingerprint pattern as personal information and collates an individual from this fingerprint pattern (see Kaihei 1-222357
6 etc.).

Various methods for performing pattern correlation at high speed by optical calculation have been proposed. For example, a method using a hologram or a joint transform correlation (J) method has been proposed.
There is one called TC) ("Fourier transform in optical information processing", Optics 21,6,392-399). This congruential transform correlation method uses a Vander-Lugt optical correlator (“Pattern recognition using an optical correlation system phase filter”, applied physics).
58, 6 (1989)), which has the advantage of not requiring precise alignment of the hologram plate on which the pattern is written.

FIG. 13 is a block diagram showing the configuration of a conventional recognition device for collating fingerprint patterns by using the joint transform correlation method. The recognition apparatus shown in the figure uses high-resolution spatial light modulators (SLMs) 400 and 401, and an input pattern (input image) and a reference pattern (reference image) are CRT'd.
The pattern 402 is drawn at the same time to detect the coincidence of both patterns. The input image and the reference image are written in the SLM 400 and Fourier-transformed to obtain a Fourier pattern.
These patterns are read again by the SLM 401 and subjected to optical Fourier transform, and the correlation signal image of these patterns is given to the photodetector (PD) 403.

If the input image and the reference image match,
In the correlation signal image given to the PD 403, a point of 0th-order light corresponding to the intensity of the original pattern appears in the center, and two points of ± 1st-order light with high brightness correspond to the left and right sides of the input image and the reference image. It becomes the image that appeared in. The coincidence between the input pattern and the reference pattern can be detected from the points of the ± first-order light in this image. Similar correlation calculation can be realized by the above-mentioned Vander-Lugh type optical correlator.

[0006]

In the above-mentioned conventional apparatus, the ± 1st-order light spot is a signal indicating the degree of correlation between the input pattern and the reference pattern. The distance to the position is proportional to the distance between the input image and the reference image written in the SLM 400. For this reason, the positions of the ± first-order light spots change depending on the positions of the input pattern and the reference pattern, making it difficult to detect the degree of correlation when there is a deviation in the input position of the input pattern.

The present invention solves such a problem, and provides a collation device which can easily correct the deviation of the input position of the input pattern.

[0008]

In order to solve the above-mentioned problems, a collating apparatus of the present invention has (a) an input surface on which a predetermined portion of the body of the person to be collated is placed, and from this input surface, a predetermined portion of the body is placed. (C) an input means for fetching the pattern, (b) a correlation calculation means for calculating the degree of coincidence between the pattern fetched by the input means and the pattern to be registered in advance, and outputting a correlation signal image; ) By displaying the correlation signal image output from the correlation calculation means, the optimum placement position on the input surface for obtaining the correlation signal image by the correlation calculation means and the predetermined part of the body of the verification target person are currently placed. And a display unit that indicates a deviation from the placement position on the input surface.

Further, the collating apparatus of the present invention has (a) an input surface on which a predetermined part of the body of the person to be collated is placed, and (b) an input means for taking in a pattern of the predetermined part of the body from the input surface. Correlation calculation means for calculating the degree of coincidence between the pattern taken in by the input means and the pattern to be registered which is registered in advance, and outputting the correlation signal image; and (d) the correlation signal image output from the correlation calculation means. By analyzing the positional relationship between the 0th-order light spot and the ± 1st-order light spot, the optimum placement position on the input surface for obtaining the correlation signal image by the correlation calculation means and the predetermined part of the body of the verification target person are determined. Based on the displacement of the mounting position on the input surface that is currently mounted and the displacement of the mounting position detected by the displacement detecting device (e), the displacement is moved to the optimum mounting position. Second display means for displaying an instruction image for

Further, the collating apparatus of the present invention has (a) an input surface on which a predetermined part of the body of the person to be collated is placed, and (b) an input means for taking in a pattern of the predetermined part of the body from the input surface. Correlation calculation means for calculating the degree of coincidence between the pattern fetched by the input means and the pattern to be referenced registered in advance, and outputting a correlation signal image; and (c) the correlation signal image output from the correlation calculation means. And (0) 0 of the correlation signal image output from the correlation calculation means.
The positional relationship between the next light spot and the ± 1st light spot is analyzed, and the optimum mounting position on the input surface for obtaining the correlation signal image by the correlation calculating means and the predetermined part of the body of the verification target are currently mounted. The position shift detecting means for detecting a shift from the mounting position on the input surface, and (e) the position shift detecting means for moving to the optimum mounting position based on the shift of the mounting position detected by the position detecting means. Second display means for displaying the instruction image.

[0011]

According to the collating apparatus of the present invention, the pattern taken in by the input means and the pattern registered in advance are given to the correlation calculating means, and the correlation signal image showing the correlation between these patterns is output. Since this correlation signal image is displayed on the display means, the person to be collated can easily determine whether or not the predetermined part of his or her body has been correctly placed on the optimum placement position on the input surface.

Further, the positional deviation detecting means analyzes the positional relationship between the 0th order light and the ± 1st order light of the correlation signal image, so that the placement on the input surface most suitable for obtaining the correlation signal image by the converting means. A shift between the position and the placement position on the input surface where the predetermined part of the verification target person's body is currently placed is detected. Based on the detection result, the instruction image for moving to the optimum placement position is displayed on the second display means. By the collation target person following the instruction of the instruction image, the predetermined part of the body can be easily moved to the optimum mounting position on the input surface.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In the description, JTC is used as the correlator.
Take the optical correlator as a typical example. The present invention is based on JT
Optical correlators other than the C-type optical correlator have similar effects.
(In the Vander-Lugt type correlator, the + 1st order light becomes the correlation peak.) FIG. 1 is a block diagram showing the configuration of the matching device according to the present embodiment. As shown in the figure, the collation device according to the present embodiment has an input unit 10 for receiving a fingerprint input pattern, a memory 20 in which a fingerprint reference pattern is registered, a CRT 30 for displaying the input pattern and the reference pattern side by side, and an input pattern. And a reference pattern to the CRT 30
With 0 and. Further, an optical address type spatial light modulator (SLM) 50 for converting an input pattern and a reference pattern into a coherent light image, a Fourier transform lens 60 for Fourier-transforming the coherent light image to obtain a congruent Fourier transform light image, An optical address type SLM 70 for converting a Fourier transform light image into a coherent light image. further,
A Fourier transform lens 80 that obtains a correlation signal image by performing Fourier transform on the coherent light image, a photodetector (PD) 90 that inputs the correlation signal image, and a pattern in which the input pattern and the reference pattern are the same from the input correlation signal image. And a determination circuit 100 for determining whether or not In addition, a CCD camera 110 that captures the correlation signal image obtained by the Fourier transform lens 80 and a CRT 120 that displays the captured correlation signal image are provided.

The input section 10 includes a prism 11 and a light emitting diode (LED) 12 for irradiating the prism 11 with light.
A CCD camera 13 that captures an input pattern and a lens 14 that forms an image of the input pattern on the CCD camera 13 are provided. In addition, the processing circuit 40 uses the keyboard 4 that gives an instruction for selecting the reference pattern registered in the memory 20.
1 is provided. Further, between the SLM 50 and the Fourier transform lens 60, half mirrors 111 and 112 for giving the read laser beam 110 to the SLM 50 are provided, and between the SLM 70 and the Fourier transform lens 80, half mirrors 113 and 112 for giving the read laser beam 110 to the SLM 70. Mirror 1
14 is provided. In addition, the Fourier transform lens 80 and PD9
Between 0, the half mirror 115 which gives a correlation signal image to the CCD camera 110 is provided.

Next, the operation of this embodiment will be described.
In the present embodiment, personal identification is performed using a fingerprint of a finger as a pattern of a predetermined part of the body. The fingerprint pattern is input by using the total reflection input method, in which light from the LED 12 is applied to the prism 11, and the verification target person puts his or her finger on the prism 1.
The fingerprint pattern is obtained from the difference in the reflection conditions when pressed against 1.

First, when the person to be collated presses a collation start key (not shown), the collation start signal is sent to the processing circuit 4.
0, and the collation process is started. Next, when the person to be collated presses his / her finger against the prism 11, the fingerprint pattern obtained on the surface of the prism 11 is transferred to the CCD camera 13.
Image on top. The CCD camera 13 converts the fingerprint pattern into a video signal and sends it to the processing device 40. Further, by operating the keyboard 41 to input, for example, a personal identification number, a fingerprint pattern (reference pattern) registered in the memory 20 in advance is selected, and this reference pattern is sent to the processing circuit 40. The selection of the reference pattern may be performed by inserting the ID card into a card reader (not shown) instead of using the keyboard 41.

In the processing circuit 40, the pair of input pattern and reference pattern sent thereto are given to the CRT 30, and
As shown in (a), the images are displayed side by side on the screen of the CRT 30 (the left half of FIG. 2A is the input pattern, and the right half is the reference pattern). The input pattern and the reference pattern displayed on the CRT 30 are written in the SLM 50 arranged facing the CRT 30.

The two patterns written in the SLM 50 are read by the read laser beam 110 and are Fourier transformed by the Fourier transform lens 60. And FIG.
The joint Fourier transform image as shown in (b) is the SLM70.
Is formed on the a-Si layer. Further, the SLM 70 is read by the laser light 110 and is Fourier transformed by the Fourier transform lens 80. With this Fourier transform,
As shown in (c), a correlation signal image composed of the central 0th-order light spot and the ± 1st-order light spots on both sides of the 0th-order light is obtained. The −1st-order light spot (or + 1st-order light spot) in this correlation signal image is the PD 90.
Detected in. The intensity of the −1 st light spot corresponds to the correlation between the two patterns. The detection signal from the PD 90 is given to the determination circuit 100, and it is determined by threshold processing whether the input pattern and the reference pattern are the same. The determination result obtained in this way is used, for example, to open and close the door and unlock the computer.

Further, the correlation signal image obtained by the Fourier transform in the Fourier transform lens 80 is a half mirror 115.
The image is taken by the CCD camera 110 through the CRT 120
Is displayed in. Here, it is assumed that the CRT 120 is installed at a position where the verification target person can be seen. The person to be verified is C
By observing the correlation signal image displayed on the RT 120, it is possible to determine whether or not one's finger is pressed to the optimum position on the prism 11.

Next, a method of judging whether the person to be collated who has observed the correlation signal image is pressing his / her finger to the optimum position on the prism 11 will be described with reference to FIG. The optimum placement position on the prism 11 for pressing a finger means a position where the input pattern 131 and the reference pattern 132 are parallel to each other as shown in the image 130 of FIG.
That is, the input pattern 131 is adjusted when the image 130 displayed on the CRT 30 is adjusted in advance and the finger is pressed to a desired position (for example, the center of the surface) on the prism 11.
And the reference pattern 132 are arranged in parallel. With this adjustment, when the person to be collated pushes his / her finger below the desired position on the prism 11, the CRT
The image 140 displayed on 30 is an image in which the input pattern 141 is arranged below the reference pattern 142 (FIG. 3).
(B)). If the person to be collated pushes his / her finger above a desired position on the prism 11, the CRT
The image 150 displayed on 30 is an image in which the input pattern 151 is arranged above the reference pattern 152 (FIG. 3).
(C)).

Images 130, 140, 150 are SLM 50
, And the Fourier transform lenses 60 and 80 perform two Fourier transforms, the correlation signal images 135, 145, and
It is converted to 155 and is imaged by the CCD camera 110.
Correlation signal images 135, 145, 1 obtained in this way
55 have the following relationships. When the line segment connecting the −1st-order light spot and the 0th-order light spot of the correlation signal image 135 obtained from the image 130 is adjusted to be parallel to the side 135a (FIG. 3A), the correlation obtained from the image 140 is obtained. Signal image 145
The position of the −1st-order light spot is below the position of the 0th-order light spot (FIG. 3B). Further, the position of the −1st-order light spot of the correlation signal image 155 obtained from the image 150 is above the position of the 0th-order light spot (FIG. 3C).

Here, the reference pattern 142 of the image 140.
Letting Δξ ₁ be the shift amount of the input pattern 141 with respect to, the moving amount y ₁ of the −1st-order light spot of the correlation signal image 145 with respect to the −1st-order light spot of the correlation signal image 135 is (f ₂ / f ₁ ) *
The amount is proportional to Δξ ₁ (f ₁ : focal length of Fourier transform lens 60, f ₂ : focal length of Fourier transform lens 80). Further, the shift amount of the input pattern 151 of the image 150 and the shift amount y ₂ of the −1st-order light spot of the correlation signal image 155 are also proportional to (f ₂ / f ₁ ) * Δξ ₂ .

Therefore, the person to be collated observes the image displayed on the CRT 120 and detects the position of the −1st-order light spot when the 0th-order light spot is the center of the image. It can be determined whether the placed finger is in the optimum position, and when it is not in the optimum position, the shift amount can be calculated. Since the −1st-order light spot and the + 1st-order light spot are located symmetrically with respect to the 0th-order light spot, even if the + 1st-order light spot is used instead of the −1st-order light spot, the same principle is used. It is possible to determine the mounting position of the.

Next, the relationship between the relative position of the input pattern 161 and the reference pattern 162 of the image 160 and the correlation signal image will be described with reference to FIG. From the figure, when the input pattern 161 and the reference pattern 162 are not parallel,
It can be seen that the distance c between the input pattern 161 and the reference pattern 162 is longer than the distance a when they are placed in parallel. This is because when the input pattern 161 and the reference pattern 162 are not parallel to each other, the carrier spatial frequency of the congruent Fourier transform image written in the SLM 50 is larger than when they are parallel to each other (the Fourier transform pattern of the input pattern and the Fourier transform pattern of the reference pattern are It means that the carrier spatial frequency when considered as a hologram is increased.

The influence of the spatial frequency of the input image to the SLM 50 on the output image is considered to be the MTF characteristic in a normal image pickup device, and the SLM 50 can be evaluated by the diffraction efficiency of the diffracted light with respect to the spatial frequency of the input grating. As an example of the diffraction efficiency of SLM50, the diffraction efficiency of PAL-SLM is shown in FIG.
From the figure, the diffraction light intensity decreases as the spatial frequency increases. That is, as the relative position between the reference pattern and the input pattern is increased, the spatial frequency of the hologram formed by the Fourier transform patterns of both patterns written in the SLM 70 increases, so that the intensity of the correlated signal light that is diffracted light decreases. In the optical system, the SLM 50, 70
A Gaussian distribution is shown in which the intensity distribution of the laser light 110 used for writing and reading is large around the optical axis and smaller toward the periphery. As described above, in order to evaluate the correlation degree (coincidence degree) in a stable manner, the stability of the correlation strength is required. For that purpose, the position of the input pattern is constant with respect to the reference pattern, and particularly, the reference pattern The input pattern should be placed in parallel with the reference pattern in order to increase the correlation strength and improve the accuracy of the measurement.

6 and 7 are block diagrams showing a modification of the collating device according to this embodiment. The modified examples of FIGS. 6 and 7 both include a semiconductor position detector (PSD) 200, an arithmetic circuit 210, and an indicator 220.
Different from the embodiment of FIG. The difference between the modification of FIG. 6 and the modification of FIG. 7 is that the modification of FIG.
In contrast to the absence of 120, the modification of FIG. 7 is provided with a CCD camera 110 and a CRT 120.

The movements of the PSD 200, the arithmetic circuit 210, and the indicator 220, which are new components, will be described with reference to the block diagrams of FIGS. The correlation signal image reflected by the half mirror 116 is given to the PSD 200, and the incident position of the ± first-order light of the correlation signal image is detected. The detection result is given to the arithmetic circuit 210, and the displacement direction and displacement amount of the position of the finger placed on the prism 11 of the input unit 10 are calculated. This calculation result is the indicator 220
The instruction display for moving the position of the finger is displayed to the verification target person.

As shown in FIG. 8A, the PSD 200
Indicates the detection surface in the moving direction of the ± first-order light of the correlation signal image reflected by the half mirror 115 (in this case, the vertical direction), and includes either one of the ± first-order lights, and does not include the zero-order light point. Install in a position that does not exist. The principle of the position detection of the PSD 200 is obtained by the resistance ratio between the incident position and the output position, as shown in FIG. When the center of the PSD 200 is used as the origin, it means that when I ₁ / I ₂ = 1 the light is incident on the center.
When I ₁ / I ₂ <1 is incident on the I ₂ side, and when I ₁ / I ₂ > 1 is incident on the I ₁ side, the incident position can be detected from the ratio of I ₁ and I _2. it can.

In this modification, the input unit 10 and the indicator 220 are the fingerprint input device 23 shown in FIGS. 9 (a) and 9 (b).
It is built into 0. The fingerprint input device 2 will be described with reference to FIG.
The configuration and operation of 30 will be described. As shown in FIG. 9A, the fingerprint input device 230 has a U-shaped guide portion 231 for placing a finger, and a window where the prism 11 is exposed is provided at the tip of the guide portion 231. Has been.
Further, as shown in FIG. 9B, the fingerprint input device 230 incorporates the prism 11, the LED 12, the CCD camera 13, the lens 14, and the indicator 220, and the output of the CCD camera 13 is sent to the processing circuit 40. It is given and the output of the arithmetic circuit 210 is given to the indicator 220.

The tip of the guide portion 231 has a circular shape, and has a guide length such that a finger can be placed almost up to the first joint. The palm side is a slope with a gentle slope, where the base of the finger and the palm can be placed naturally. With such a structure, when the collation target person puts his / her finger, the finger tip is first placed on the circular vertex, and the finger is placed along the guide portion 231 in order from the finger tip. The misalignment of the fingerprints is small, and the fingerprint can be read at the optimum position by mainly correcting the misalignment of the upper and lower positions. The vertical displacement is displayed on the indicator 220 installed beside the guide on which the finger is placed, and the person to be collated can know the displacement of the finger position.

The indicators 220 include arrow lamps 220a and 220b which are lit (or may blink) when the finger is displaced upward, and a circle lamp 220c which is lit when the finger is placed in a normal position. And arrow lamps 220a and 220b that are turned on when the finger is displaced downward. Furthermore, by changing the lamp of the arrow to be turned on according to the amount of positional deviation, it is possible to notify the collation target person of the positional deviation. In this example, when there is a lot of deviation, the arrow lamp 220a,
Any one of the lamps 220e and 220d is turned on, and either one of the lamps 220b and 220d indicated by the arrow is turned on.
When the finger is placed at the optimum position, the circle in the center of the indicator 220 lights up to inform the verification target person that the verification is normally performed.

Further, in this modification, the following measures are taken in order to correctly input the fingerprint. When the collation target person moves his / her finger while being in contact with the prism 11 in accordance with the lighting of the lamp of the indicator 220, the input pattern of the fingerprint is distorted, and the intensity of the correlation signal may be reduced due to the distortion. In order to eliminate this inconvenience, in this modification, as shown in FIGS. 10A and 10B, the fingerprint input device 230 is provided with a mechanism for moving the prism 11 up and down. FIG. 10A shows a state in which the prism 11 is raised, and FIG.
(B) shows the state where the prism 11 is lowered. This mechanism lowers the prism portion 233 guided by the linear guide 232 by the linearized motor 234 in accordance with the lighting of the lamp of the indicator 220 so that the finger does not contact the prism 11. Then, the collation target person who sees the lighting of the lamp of the indicator 220 raises the prism portion 233 with the linear motor 234 at the timing when the finger has finished moving, and brings the prism 11 into contact with the finger. The timing for raising the prism portion 233 may be a timing for obtaining a certain time from the fall to the rise, or may be a timing for stopping the movement of the finger detected by the detection unit (not shown). A spring 235 is provided below the prism portion 233 to keep the contact pressure between the prism 11 and the finger at an appropriate value.

An operation example of the fingerprint input device 230 having the above configuration will be described with reference to the flowchart of FIG. First, when the verification target person inserts an ID card in which a personal registration number or the like is recorded into a card reader (not shown) (step 300), it is confirmed whether the ID card exists in the registrant list registered in the memory 20. Done. If the person to be collated is a registrant, the reference pattern of the fingerprint already recorded is read and displayed on the CRT 30 together with the input pattern of the fingerprint input by the fingerprint input device (step 301). Then, the display image of the CRT 30 is written in the SLM 50,
It is converted into a correlation signal image by two Fourier transforms in the Fourier transform lenses 60 and 80, and the −1st order light (or + 1st order light) of the correlation signal image is detected by the PSD 200 (step 302). Here, since the PSD 200 detects the position from the center of gravity of the -1st-order light, it does not have to be the -1st-order light having a high brightness and a small spot obtained when the input pattern and the reference pattern are the same pattern. The outputs I ₁ and I ₂ from the PSD 200 are given to the arithmetic circuit 210 and output I
The shift direction and shift amount of the −1st-order light spot are calculated from the ratio of ₁ to the output I ₂ (step 303).

In order to turn on the lamps of different indicators 220 according to the shift amount of the −1st-order light spot, the procedure is as follows. A point C where I ₁ / I ₂ = α is set between the center point A of the PSD 200 and the end point B of the PSD 200, and −1st order light is detected on the side of the center point A from this point C, and I ₁ / I ₂ ≧ If it becomes α, it is determined that the deviation is small, and the arrow 220b of the arrow of the indicator 220 is turned on (step 306) to instruct to move the finger downward.
Further, −1st-order light is detected from the point C to the end point B side, and I ₁ /
If I ₂ ≦ α, it is determined that the indicator 220 is misaligned, and the lamp 220a indicated by the arrow is turned on (step 307) to instruct to move the finger downward. In accordance with the lighting of the lamp of the indicator 220, the prism 11 once descends away from the finger (step 308). Then, the prism 11 moves up again at the timing when the movement of the finger is completed (step 30
9), the prism 11 comes into contact with the finger again, and the matching process is performed again.

The center point A of PSD 200 and PSD 2
The same process is performed when the −1st order light is detected between the end points D of 00 (steps 310 to 314).

Further, the outputs I ₁ , I from the PSD 200 are
_{When 2} becomes I ₁ = I ₂ , the circle mark 220c is turned on (step 315) and the collation target person is informed that the finger is placed at the optimum position. In this state, the prism 11
Moves up and down (steps 316 and 317), and the distortion of the fingerprint input pattern can be removed. Then, the correlation signal image of the fingerprint input pattern and the reference pattern input at the optimum position is 2
It is obtained by Fourier transform of the number of times. The intensity of the −1st-order light of this correlation signal image is measured by the PD 90 (step 318), and the measured value is given to the determination circuit 100. The determination circuit 100 determines whether or not the intensity of the ± first-order light is greater than the registered threshold value (step 319), and if it is greater than that, determines that the collation target person is a contractor (step 320). When it is determined that the user is a contractor, for example, a security door is opened as a process performed for the contractor (step 321). Further, when it is determined in step 319 that it is smaller than the registered threshold value, the same operation is repeated, and when it is determined that the patterns are not the same even if the verification is performed three times, the verification target person is not the contractor. A judgment is made (step 324).

In this embodiment and this modification, the fingerprint is used as the pattern of the predetermined part of the body to perform the person verification, but the fingerprint is not limited to the fingerprint, and for example, the pattern of the palm or the sole of the foot can be used. A pattern or the like may be used.

Further, instead of the CRTs 30 and 120,
Other display devices such as liquid crystal displays and plasma displays may be used.

Further, in this embodiment and this modification, SL is used.
Although an optical address type SLM is used as M50 and M70, an electric address type SLM may be used.

Furthermore, the fingerprint input by the input unit 10 may be performed by holography as shown in FIG. 12, instead of the prism 11. In this sensor, a hologram 351 is formed on a part of a transparent glass flat plate (light guide plate) 350, and laser light is emitted from a laser light source 352 on the opposite side of the other end. Is detected.

[0041]

As described in detail above, in the collation device of the present invention, the correlation signal image of the pattern taken in by the input means and the pattern registered in advance is displayed on the display means, so that the person to be collated is , It is possible to easily judge whether or not a predetermined part of one's body has been correctly placed on the optimum placement position on the input surface.

Further, the positional deviation detecting means analyzes the positional relationship between the 0th order light and the ± 1st order light of the correlation signal image, so that the optimum placement position on the input surface and the predetermined part of the body of the person to be verified. The deviation from the position on the input surface on which is currently detected is detected. The collation target person can easily move the predetermined part of the body to the optimum mounting position on the input surface by following the instruction of the instruction image displayed based on the detection result.

As described above, the collating apparatus of the present invention can shorten the collating time and improve the collating accuracy.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a matching device according to an embodiment.

FIG. 2 is a diagram showing an input image, a Fourier image, and a correlation signal image.

FIG. 3 is a diagram showing a relationship between a display image on a CRT and a correlation signal image.

FIG. 4 is a diagram showing a relationship between an input pattern and a reference pattern.

FIG. 5 is a diagram showing the diffraction efficiency of PAL-SLM.

FIG. 6 is a block diagram showing a modified example of the matching device according to the present embodiment.

FIG. 7 is a block diagram showing a modification of the matching device according to the present embodiment.

FIG. 8 is a diagram showing a PSD installation position and a principle of PSD position detection.

9A and 9B are a perspective view showing the appearance of a fingerprint input device and a cross-sectional view showing the structure.

FIG. 10 is a sectional view showing a mechanism for moving a prism up and down.

FIG. 11 is a flowchart showing an operation example of a fingerprint input device.

FIG. 12 is a diagram showing an input unit using holography.

FIG. 13 is a block diagram showing a configuration of a conventional recognition device.

[Explanation of symbols]

10 ... Input part, 11 ... Prism, 12 ... Light emitting diode, 13 ... CCD camera, 14 ... Lens, 20 ... Memory, 30, 120 ... CRT, 40 ... Processing circuit, 41 ... Keyboard, 50, 70 ... Spatial light modulator , 60, 80 ... Fourier transform lens, 90 ... Photo detector, 100 ...
Judgment circuit, 110 ... CCD camera, 111-115 ... Half mirror, 130, 140, 150, 160 ... Image,
131, 141, 151, 161 ... Input pattern, 13
2, 142, 152, 162 ... Reference pattern, 135,
145, 155 ... Correlation signal image, 200 ... Semiconductor position detector, 210 ... Arithmetic circuit, 220 ... Indicator, 23
0 ... Fingerprint input device, 231 ... Guide part, 232 ... Linear guide, 233 ... Prism part, 234 ... Linear motor, 235 ... Spring, 350 ... Glass flat plate, 351 ... Hologram, 352 ... Laser light source, 353 ... Imaging device.

Front Page Continuation (72) Inventor Yuji Kobayashi 1 1126 Ichinomachi, Hamamatsu City, Shizuoka Prefecture 1126 Hamamatsu Photonics Co., Ltd. (72) Inventor Tsutomu Hara 1 1126 Nonomachi, Hamamatsu City Shizuoka Prefecture 1 Hamamatsu Photonics Co., Ltd. ) Reference JP-A-3-280179 (JP, A) JP-A-3-105692 (JP, A) JP-A-57-61391 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB) Name) G06T 7/00-7/60 G06T 1/00

Claims (4)

(57) [Claims] 1. A collation device for collating an individual by using a pattern of a predetermined part of the body, which has an input surface on which a predetermined part of the body of the person to be collated is placed, and a predetermined part of the body from the input surface. Input means for receiving a pattern, correlation calculating means for calculating the degree of coincidence between the pattern acquired by the input means and a pattern to be registered in advance and outputting a correlation signal image, and the correlation calculating means By displaying the output correlation signal image, the placement position on the input surface that is optimal for obtaining the correlation signal image by the correlation calculating means and the predetermined part of the body of the verification target person are currently placed. And a display unit that indicates a deviation from the mounting position on the input surface. 2. A collation device for collating an individual by using a pattern of a predetermined part of the body, which has an input surface on which a predetermined part of the body of the person to be collated is placed, and a predetermined part of the body from the input surface. Input means for receiving a pattern, correlation calculating means for calculating the degree of coincidence between the pattern acquired by the input means and a pattern to be registered in advance and outputting a correlation signal image, and the correlation calculating means A mounting position on the input surface that is optimum for obtaining the correlation signal image by the correlation calculating means by analyzing the positional relationship between the 0th-order light spot and the ± 1st-order light spots of the output correlation signal image, Based on the displacement of the placement position detected by the displacement detection means for detecting the displacement from the mounting position on the input surface where the predetermined part of the body of the collation target is currently mounted, , Move to the optimum placement position And a second display unit for displaying an instruction image for moving the collation device. 3. A collation device for collating an individual by using a pattern of a predetermined part of the body, which has an input surface on which a predetermined part of the body of the person to be collated is placed, and a predetermined part of the body from the input surface. Input means for receiving a pattern, correlation calculating means for calculating the degree of coincidence between the pattern acquired by the input means and a pattern to be registered in advance and outputting a correlation signal image, and the correlation calculating means Display means for displaying the output correlation signal image; and a positional relationship between the 0th-order light spot and the ± 1st-order light spots of the correlation signal image output from the correlation calculation means, and the correlation calculation means Position shift detection for detecting a shift between a mounting position on the input surface that is optimal for obtaining a correlation signal image and a mounting position on the input surface where a predetermined part of the body of the verification target person is currently mounted. Means and Based on the deviation of the detected mounting position by displacement detection means, collation apparatus characterized by comprising a second display means for displaying an instruction image for moving the optimum mounting position. 4. The correlation calculation means forms a Fourier transform image by performing a first Fourier transform from the pattern taken in by the input means and a pattern to be referenced registered in advance, and the Fourier transform image The collation device according to any one of claims 1 to 3, wherein the correlation signal image of the two patterns is output by performing a second Fourier transform on the.