JPS6243784A - Person identifying device - Google Patents

Abstract

PURPOSE:To remove the influence of external factors by providing an image pickup means for obtaining contour data and a recognition processing means for analyzing contour data and collating the analyzed data with registered data to execute personal identification processing. CONSTITUTION:A projector 3 radiates plate-like horizontal beams to the face of an object A to form an intersecting line 12 between the nose part (a) on the face and the horizontal beams 11. The intersecting line 12 is formed along the outline of the nose part (a) and the height of the projecting path of the horizontal beams 11 is changed stepwise to form intersecting lines corresponding to respective height values and specify the shape of the nose part (a) as contours h1-h6. The constitutional data of each intersecting line in each height are found out by single-eye stereoscopic vision method and the constitutional data of each intersecting line in a prescribed height Hi against reference height are found out by defining the height of a visual protection part 10 as the reference height. Consequently, a highly reliable device free from the influence of external factors can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a personal authentication device for checking whether a subject is a specific individual.

<Summary of the Invention> This invention emits a plate-shaped horizontal light onto the subject's face.
Lines of intersection with the horizontal light along the contour of the nose are generated at predetermined height intervals, and a two-dimensional image of each line is obtained by the imaging means, which is then analyzed by the recognition processing means to identify the subject. The system performs personal authentication processing, which enables highly reliable personal authentication.

<Background of the Invention> Conventional personal authentication devices include a method that uses a fingerprint as an authentication object, a method that uses a voiceprint as an authentication object, and the like. However, in the case of the former method, if the finger surface is dirty or scratched, the fingerprint changes,
There are also problems such as giving a feeling of disgust to the subject. On the other hand, in the case of the latter method, there were problems such as the voiceprint being susceptible to fluctuations due to factors such as a cold, and the determination of the Buddha's seat using a tape recorder being inaccurate.

<Object of the invention> This invention is intended to solve the above problems,
The purpose is to provide a highly reliable personal authentication device that is less susceptible to external factors.

<Configuration and Effects of the Invention> In order to achieve the above object, the personal authentication device of the present invention includes a face support means for supporting and fixing the face of the subject;
a light projecting means that emits a plate-shaped horizontal light toward the subject's face while changing the height, and generates lines of intersection with the horizontal light that follow the contour of the nose portion at predetermined height intervals; , an imaging means for obtaining contour line data for identifying the shape of the nose by obtaining a two-dimensional image of the intersecting lines for each height; and an image capturing means for obtaining contour line data for specifying the shape of the nose; and a personal authentication process for the subject by analyzing the contour line data and comparing it with registered data. It was decided to provide a recognition processing means for executing the recognition processing.

According to this invention, each line of intersection with the horizontal light generated at the nose part of the face is one line of intersection with the contour line of the cut surface obtained by cutting the nose part at each height of the horizontal light. . Therefore, in this invention, since the shape of the nose part that is difficult to change is targeted for authentication, by comparing the contour line data on each of the intersection lines with reference data, reliability can be verified that is less susceptible to external factors. A high level of personal authentication can be achieved. Moreover, the intersection line is a curve on a plane at a certain height (
(one-dimensional data), so the amount of data is small,
Therefore, the time required for detecting intersecting lines and comparing with registered data can be extremely shortened. Furthermore, since the height of the plate-shaped horizontal light is known, the height of the point on the intersecting line can be determined accurately, and monocular stereoscopic viewing is possible with a single television camera, which is a remarkable effect of achieving the purpose of the invention. play.

<Description of Embodiments> FIG. 1 shows an example of the overall configuration of a personal authentication device according to the present invention.

In the illustrated example, a support 2 is installed vertically at one end of a substrate 1, a projector 3 is disposed on the support 2, and a television camera 4 made of a two-dimensional CCD or the like is supported tiltably on the support. It is something.

A chair 5 on which the subject A sits is fixed at the other end of the substrate 1, and a face support 6 is disposed on the upper end surface of the backrest of the chair 5 so that its height can be adjusted. Illustrated facial support device 6
has a structure that can be fixed at an arbitrary height by tightening the screw 8 after sliding the support shaft 7 up and down.
a face fixing part 9 positioned corresponding to the height of the chin of the subject A;
A visual protection section 10 is provided, which is located at a height corresponding to the eye level of the subject A. The face fixing part 9 fixes the face by protruding its arms to both sides of the face, and the visual protection part 10 covers the front position of the eyes in a band shape of a certain width, so that the horizontal light 11 (described later) is directed to the eyes. prevent it from entering.

The light projecting device 3 emits a plate-shaped horizontal light 11 to the face of the subject A, thereby directing the horizontal light 11 to the nasal part a of the face.
This is to generate an intersection line 12 with the . This intersection line 12 is formed along the contour of the nose portion a, as shown in FIG. By generating an intersection line corresponding to , the shape of the nose part a is specified as a contour line -h as shown in FIG.

In addition, in this Fig. 3, the above-mentioned contour lines, ~
h, and in this case, each contour line h1 to h is parallel to the xy plane.

FIGS. 4 and 5 show an example of the structure of the light projecting device 3. FIG. In the figure, a laser scanner 13 reflects a laser beam 15 emitted from a laser light source 14 downward by a mirror 16, and the mirror 16 is moved in parallel along an In the figure, the height of the light projection path can be variably set by moving in parallel in the direction of the arrow. This laser beam 15 is converted into a fan-shaped light 20 by a cylindrical lens 19, and this light 20 is further converted into a fan-shaped light 20.
0 is reflected by a mirror 21 to generate a plate-shaped horizontal light 11.

This horizontal light 11 is applied to the intersection line 12 on the nose part a of the face.
This intersection line 12 is imaged by the television camera 4. A two-dimensional image of the intersection line 12 appears as a bright line on the image plane of the television camera 4, and this two-dimensional image is sent as a video signal 22 to a control processing unit 23 consisting of a microcomputer.

The control processing device 23 performs a binarization process on the input image, extracts the bright line (intersection line), and then performs the analysis described in detail below to perform the authentication process of the subject. do.

FIG. 6 shows the flow of the control operation of the control processing device 23, that is, the personal authentication processing operation.

First, in step 1 of the figure (indicated by rSTIJ in the figure), the control processing device 23 inputs an ID number for identifying the subject.
In the next step 2, the control processing device 23
The registration data of the corresponding subject is read out from the memory of the patient and sent to the work area or the like.

Figure 7 shows the contents of this registered data, including data that defines the height range of the intersection line, and the visual protection area of the subject.
Data defining the height of O, a predetermined height Hi based on the visual protection part IO (however, i = 1, 2..., N)
It includes data configuring each intersection line in , threshold data for matching nose shapes, etc.

Next, the elderly person to be examined is seated on the chair 5, and the face fixing part 9 and the visual protection part IO of the face support 6 are set at appropriate places on the face of the patient A. First, in step 3, the visual protection part 10 is The degree of loss is checked between the measured value and the registered data (step 4). This step 4 is
First, it uses the eye height as a clue to determine whether or not this subject A is the registered person.If the determination in step 4 "Is the height of the visual protection part appropriate" is "YES"? ,
Next, the process moves to a personal authentication process by projecting the horizontal light 11.

That is, in the next step 5, the control processing device 23
However, when the light projector 3 is activated, the horizontal light 11 is projected onto the subject's face, and an intersection line 12 is generated on the surface of the nose portion a. And the TV camera 4 is connected to this intersection line 1.
2, and the image is taken into the control processing device 23. The control processing device 23 performs processing such as binarization on the input image, thereby extracting intersecting lines on the image. Next, the control processing device 23 calculates 3 of each point q on the intersection line 12.
Measure dimensional coordinates.

FIG. 8 shows the principle of monocular stereoscopic viewing performed when measuring these coordinates. First, the three-dimensional coordinates of the image point Q on the image plane 24 of the television camera 4 are determined, and then a straight line 25 connecting this image point Q and the lens center point R of the television camera 4 is obtained. Next, extend this straight line 25 to the image point °
Fellowship corresponding to Q &? Obtain a point q on tlZ, and then calculate the three-dimensional coordinates (xq,
Calculate yq, h). This coordinate calculation operation is performed for all image points, thereby making it possible to obtain the three-dimensional coordinates of each point constituting the intersection line I2.

The above-mentioned generation process of the intersection line 12 is performed by changing the projection height h of the horizontal light 11 at predetermined intervals (for example, several intervals), and the monocular stereoscopic viewing method shown in FIG. 8 is performed for each intersection line. By doing this, the configuration data of the intersection lines (corresponding to the contour lines in FIG. 3) for each height can be determined. In this example,
With the height of the visual protection unit 10 as a reference, a predetermined height Hl (where 1=L2...) with respect to this reference height.

Constituent data of each intersecting line for n) is obtained.

In this way, the configuration data of each intersection line is obtained in the next step 6.
, the correlation value is calculated by comparing it with the registered data shown in Fig. 7, and it is determined whether or not the subject A is the person himself/herself, depending on whether or not this correlation value is greater than or equal to a threshold value. (Steps 717-9).

By the way, in this embodiment, - prior to the above-mentioned matching process, each data of the xy coordinate system making up the intersection vA12 is not affected by parallel movement or rotation in the three-dimensional space! [The data is converted to data in another coordinate system (98 coordinate system in this case), thereby facilitating the verification process.

That is, in this embodiment, as shown in FIG. 9, for each point q of the intersection line 12F, the external angle (for example, θ23) of the line connecting that point (for example, qz) and the next point (for example, q3) is determined and Let the cumulative value be ψ(ql)7, and calculate the distance between each point (for example, L2.) and calculate the cumulative value as S(q,)
These, 9'(q;
) and performs data conversion.

FIG. 10 shows a specific example of the above transformation, and the xy coordinates (x (k), y
(k)) is the coordinate (S(k), CP(
k)).

The following formulas express the above ■■2 more specifically, and by executing the calculations of these formulas for the kth point, the above conversion data 9) (k), s l
) can be obtained.

(5(0)-=0 when llk=o 9)(0)=O +21 and S when=1 (1) -(x(1)-x(0))" +
(y(1)-y(0))z9(1)-〇(3) When k≧2, S (k) −3(K-1)+ (dx+)2+
(dy+)z However, the above dx, dXz+dy+, d
Vz is as follows.

d x , = x (k) −x (k-1) d
X2 = x(k-1) -x(k-2)dy+
=y(k)y(k-1)d)'z
= y(k-1) y(k-2) The data converted above is compared with the registered data in step 6, and depending on whether the correlation value between the two is greater than or equal to the threshold, it is determined whether the subject is the real person. It is determined whether or not (steps 7 to 9).

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a personal authentication device according to the present invention;
Figures 2 and 3 are diagrams showing intersection lines generated on the face, Figures 4 and 5 are structural illustrations of the light projector, and Figure 6
Figure 7 is a flowchart showing the flow of personal authentication processing, Figure 7 is a diagram showing the contents of registered data, Figure 8 is a diagram explaining the principle of monocular stereoscopic vision, Figure 9 is a diagram explaining the principle of data conversion, and Figure 10 is a diagram showing the principle of monocular stereoscopic vision. FIG. 3 is a diagram showing an example of data conversion. 3... Light projector 4... TV camera 6
...Face support device 11...Horizontal light 23...
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94) Cubo Electric Co., Ltd. Representative Takao Tateishi 4, Agent name (7891) Patent attorney Yoshimitsu Suzuki In the drawing, write a leader line with the code r3 in ``Figure 1'' as shown in attached paper ink. Sweet/)Z Personal 6th place. 3--4 Q light 1 6--60 low cultivation tools Z3- 1 #ρ116 equipment---Pure dokanora/no-1 man's hand A5

Claims (4)

[Claims] (1) A face support means for supporting and fixing the subject's face, and a plate-shaped horizontal light beam that emits a plate-shaped horizontal light toward the subject's face while changing the height, and the horizontal light that follows the contour of the nose area. a light emitting device that generates lines of intersection with the light at predetermined height intervals; an imaging device that obtains contour line data for identifying the shape of the nose by obtaining a two-dimensional image of the lines of intersection at each of the heights; and the contour lines. A personal authentication device comprising a recognition processing means that analyzes data and compares it with registered data to perform personal authentication processing of a subject. (2) The personal authentication device according to claim 1, wherein the face support means includes a visual protection band for preventing horizontal light from entering the subject's eyes. (3) The personal authentication device according to claim 1, wherein the imaging means is a television camera comprising a two-dimensional CCD. (4) The personal authentication device according to claim 1, wherein the recognition processing means is a microcomputer.