JPH067388B2 - Human phase data measuring device - Google Patents

Description

The present invention relates to a human phase data measuring device, and can be applied to the case of comparing two human phase images to determine whether they are the same person or not.

For example, when determining whether the person's appearance in the photograph attached to a certificate such as an identification card is the same as the person's appearance in the photograph, leave it to the conventional manual judgment. It was being done. By the way, it is difficult to obtain quantitative data from the human face, so it is practical to rely on the comprehensive judgment of the auditors who have received specialized training to judge whether the human face is the same. It was considered to be a solution method.

The following items can be considered as the obstacles when judging the identity of human appearance.

First, from the outside with respect to the true face of the target person, such as the direction in which the face is observed (horizontal direction, degree of vertical angle), the presence or absence of jewelry, the condition of hair, the presence or absence of beard, the presence or absence of makeup, etc. If the added appearance factors are different, the personalities perceived as a whole are likely to be different.

Secondly, if there is a difference in appearance due to internal causes (so-called internal factors) of the target person, such as differences in emotions, changes in health status, age differences, etc. It has a considerable impact.

Thirdly, when the face of the target person is permanently deformed (so-called permanent deformation factor), such as when the face is traumatized or plastic surgery is performed, the human appearance It is unavoidable that there will be a difference.

Considering these conditions, it is considered that the true face of the target person is determined as a personal feature based on the facial skeleton and facial muscles, so the configuration of the eyes, mouth, nose, eyebrows, etc. that make up the facial appearance. It is possible to obtain electrical data that makes it easy to directly grasp the characteristics of the shape or position of a part, and to eliminate the factors that hinder the determination of the identity of human phases as noise. It is considered that the comparison of the human image and the determination of the identity (determining whether they are the same) can be realized by using the electronic data processing technique.

The present invention has been made in consideration of the above points, and the shape or position of a face constituent part is defined as a half point on a line connecting both eyes (for example, a line connecting the centers of pupils of both eyes). Measures in the polar coordinate system that is the measurement reference point of the human phase, transforms the measured data into the orthogonal coordinate system, and then compares the transformed data with each other, so that the identity of the human phase can be accurately determined. It is a thing.

An embodiment of the present invention will be described in detail with reference to the drawings. First
In the figure, (1) shows a human phase recognition device as a whole, and includes a human phase data measuring device (2). The human phase data measuring device (2) is a television camera (3) that captures an electric image signal S1 by photographing a face of a target person, and a contour enhanced image signal from the image signal S1 obtained from this camera (3). A contour emphasis processing circuit (4) for obtaining S2 and the contour emphasis image signal S2
Is regarded as an image expressed in polar coordinates, and measurement data is obtained, and this is converted into data in a rectangular coordinate system and is output as a human phase data signal S3.

The contour enhancement processing circuit (4) performs differential inversion processing on the video signal S1 obtained from the camera (3) to binarize it, and thus contour enhancement of the face and its constituent parts represented by a black level as shown in FIG. An edge-enhanced image signal S2, which is an image processing signal corresponding to an image, is given to the polar coordinate-orthogonal coordinate converter (5).

Here, the contour emphasis processing circuit (4) externally applies external factors to the bare face of a person who becomes an obstacle in determining the identity of the human appearance (for example, the presence or absence of jewelry such as eyeglasses, a hair condition, With or without beard, with or without makeup), or causes caused by the inside of the person (for example, emotions, health, age difference), or permanent deformation (for example, due to trauma or plastic surgery) applied to the person's bare face. Data such as facial skeletons and facial muscles of a person necessary for determining the identity by removing unnecessary data (such as difference in appearance) (for example, eye, nose, mouth, eyebrow, wrinkle outline from mouth to nose) Only the signal is extracted and given as a contour-enhanced image signal S2 to the polar coordinate-rectangular coordinate transformation device (5).

The polar coordinate-orthogonal coordinate converter (5) first converts the edge-enhanced image signal S2 into a polar coordinate signal equivalent to that represented as an image on polar coordinates as shown in FIG. Here, the origin P of polar coordinates
(R = 0, θ = 0) is, for example, the image on the polar coordinates of the contour-enhanced image signal S2, that is, the left and right eyes (11L) and (11R) of the face represented by the contour and its constituent parts, for example, It is set at a point that divides the line segment connecting the centers of the pupils into two equal parts.
Then, the conversion device (5) graduates the angle θ from 0 ° to 360 ° in the counterclockwise direction in FIG. 2 with reference to the extension line of this line segment, and the r direction of each part of the contour line with respect to the origin at each angular position. Is calculated and converted into an image signal in a Cartesian coordinate display which is equivalent to the angle θ in the x-axis direction and the length r in the y-axis direction as shown in FIG. The coordinate display image signal is sent as the human phase data signal S3 of the human phase data measuring device (2).

The human phase data signal S3 of the human phase data measuring device (2) is stored in the memory (11). Thus, the human phase data signal S3 stored in the memory (11) is converted into the rectangular coordinate-polar coordinate converter (12).
Through the plotter (13), a contour-enhanced image displayed in polar coordinates is drawn out in the same manner as described above with reference to FIG. 2 on the plotter (13). It is designed to be done in.

On the other hand, read the ID card (15) to compare the image of the person described in the ID card, such as a certificate photograph, portrait photograph, portrait, etc. A personal phase data signal S of the human phase data measuring device (2) obtained from the polar coordinate-orthogonal coordinate converting device (5) with the ID card human phase data signal S4 read by inserting it into the device (16).
3 is compared with the comparison device (17) to detect the overlapping areas, and the comparison result is sent out as the appraisal signal S5. Here, the human phase data signal S3 includes the contour position data representing the shape and position of the constituent parts such as eyes, mouth, nose, and eyebrows that make up the appearance of the face, and this is the appraisal standard in the comparison device 17. By being compared with the appraisal reference data included in the ID card personal phase data signal, the appraisal signal S5 representing the appraisal result is obtained.

In this way, the identity of the human appearance can be judged without the judgment of the appraiser.

Here, as the reading device (16), it is possible to use one having a structure in which the video signal read from the ID card (15) is subjected to contour enhancement processing and sent as a read signal. Instead of this, ID card (1
It is also possible to describe the human phase image with edge enhancement in 5) and not perform the edge enhancement processing in the reading device (16).

In the above configuration, the image of the face of the target person photographed by the camera (3) is subjected to contour enhancement processing in the contour enhancement processing circuit (4) and is substantially an image of the contours of the face and its constituent parts. (Fig. 2) is obtained, followed by polar coordinates-
A rectangular coordinate image (FIG. 3) is obtained in which the coordinates are converted in the rectangular coordinate conversion device (5) so that the latitude line on the polar coordinates corresponds to the x axis and the meridian corresponds to the y axis.

The Cartesian coordinate image thus obtained is the origin (r =
0, θ = 0) and θ = 0 ° to 360 around it
An image similar to that obtained by expanding the contours of the facial components scattered over the range of ° in the x-axis direction. However, in this image, the constituent parts of the face are dispersed in the x-axis direction, so that the contour shape of each constituent part can be more easily grasped. Further, the position of the constituent part in this image directly represents the distance from the origin of the polar coordinate image to the contour line of each constituent part, and therefore also the relative positional relationship of each constituent part.

Therefore, it is determined whether or not the positions and contour shapes of the respective constituent parts are substantially the same by comparing the two orthogonal coordinate images so as to be superimposed, and if they are substantially the same, it can be determined that the person is the same person.

By the way, it is said that the distance between eyes is statistically small across races, genders, etc. in statistical terms, and regarding this point, by setting the origin of polar coordinates to the center position of both eyes in the above configuration. , The influence of human factors such as race and discrimination of the target person can be virtually ignored, and the influence of the orientation of the face taken can be almost ignored. According to the experiment, the distance between the pupils of both eyes, in other words, the distance between the centers of the pupils is about 6
It is 3 [mm] ± several [mm], and it can be said that the origin is at the center position of the face, so even if the orientation of the face changes, the position of the face component with respect to the origin hardly changes, and The contour shape of the components does not show any extreme change.

According to the experiment, the human phase data signal S3 (FIG. 3) obtained by photographing from the front of the human phase data measuring device (2) in the configuration of FIG. As shown in the figure, when compared with the output (FIG. 5) of the reading device (16) in the case where a slightly lateral portrait was used, similarities were obtained between the two so that they could be judged to be substantially the same. By the way, the size and curvature of the contour figure of each constituent part of the two orthogonal coordinate images (Figs. 3 and 5) are positive and negative, and the mutual positional relationship of the contour figures of each constituent part is different even if the face orientation and , The personal characteristics are well represented even if there is a difference in magnitude relationship, and therefore, this characteristic can be evaluated as numerical data.

In view of this point in FIG. 5, the contour figures (21) and (22) of the portions corresponding to the left eye and the left eyebrow are the corresponding contour figures (24) and (25) of the human phase data signal S3 in FIG. It can be said that they are very similar to each other because the overlapping area with) is large, and the contour figures (28) and (29) of the portions corresponding to the right eye and the right eyebrow are the corresponding contours of the human phase data signal S3 of FIG. It can be said that they are very similar because the area that overlaps with the figures (26) and (27) is large,
In addition, the outline figure of wrinkles from the mouth, nose and mouth to nose (3
It can be said that 0), (31) and (32) are very similar to each other because they have a large overlapping area with the corresponding figures (33), (34) and (35) of the human phase data signal S3 in FIG. Therefore, a face drawn in a caricature that is recognized as relatively similar captures well the personal characteristics of the target person's real face, in other words, it is added from the outside to the real face as described at the beginning. Even if the appearance factor is different, the appearance is different based on the inner factor generated from the inner surface, or the appearance is different due to permanent deformation of the bare face, it looks like a caricature. If the personal features of the bare face are common to the extent that they are recognized as being similar to, the contour shapes and the positions of the constituent parts on the Cartesian coordinate image occur as a distributed form that closely resembles each other, so that they overlap each other. The area becomes large. Therefore, the identity can be easily grasped by determining whether or not the overlapping areas are large.

In the above description, the case where the face is photographed from the front by the camera (3) has been described, but instead of this, if the face is made slightly sideways, the human-phase data signal S3 of the polar coordinate-orthogonal coordinate converter (5) is obtained. Information including three-dimensional concavo-convex information can be obtained, and by doing so, the three-dimensional characteristics of the facial components can also be used as the determination information of identity, thereby more accurately determining the identity of human appearance. be able to.

As described above, according to the present invention, the line segment connecting both eyes is approximately 1 /
By setting the position of 2 as the origin of polar coordinates and obtaining polar coordinate data signals, and converting these into orthogonal coordinate data signals to obtain the human phase data signal S3, the personal characteristics of the bare face of the target person are obtained. Can be obtained as an electrical signal in a format that can be processed by numerical data. Therefore, it is possible to easily judge the identity of human appearance without human intervention.

[Brief description of drawings]

FIG. 1 is a block diagram showing a human phase recognition device using a human phase data measuring device according to the present invention, FIG. 2 is a schematic diagram used for explaining an edge-enhanced image signal, and FIG. 3 is its orthogonal coordinate display image. FIG. 4 is a schematic diagram for explaining a signal, FIG. 4 is a schematic diagram for explaining a human phase data signal input from an ID card, and FIG. 5 is a schematic diagram for explaining a Cartesian coordinate display image signal. . (1) ... Human phase recognition device, (2) ... Human phase data measuring device, (3) ... Television camera, (4) ... Edge enhancement processing circuit, (5) ... Polar coordinate-orthogonal coordinate converter, (11) ... memory, (12) ... Cartesian-polar coordinate converter, (13) ... plotter, (15) ... ID card, (16) ... reader, (17) ... comparison device.

Claims (1)

[Claims] 1. A television camera for photographing a face of a target person to obtain an image signal, a contour enhancement processing circuit for subjecting the image signal to a contour enhancement image signal to obtain a contour enhancement image signal, and the contour enhancement image signal. And a means for setting approximately half the position of the line segment connecting the two eyes to the origin of the polar coordinate system, and the image input in the polar coordinate system, in which the latitude and longitude on the polar coordinate system are the X-axis and the Y-axis of the orthogonal coordinate system. Coordinate format conversion means for outputting a contour position data signal whose format is converted into a coordinate system corresponding to the axis, and the contour position representing the shape and position of the eye, mouth, nose, eyebrow and other components forming the appearance of the face A human phase data measuring device, comprising: a comparing unit that obtains an appraisal result signal by comparing a data signal with an appraisal standard data signal serving as an appraisal standard.