JPH08235117A - Individual certification system - Google Patents

Abstract

PURPOSE: To make certifying operation smooth by suppressing deterioration in the picture quality of a reproduced image by increasing the image size of a face image to be displayed or decreasing the compressibility. CONSTITUTION: Face image information on a bearer is separated into compressed data of a luminance signal and compressed data of a color difference signal, which are printed as two-dimensional codes; and the two-dimensional codes are stuck on the reverse side of an ID card 21. The two-dimensional codes on the ID card are read individually by a two-dimensional code reader 31 and decoded by a two-dimensional code decoder 32 respectively. The decoded image compressed data are supplied to an image expansion part 33 and expanded, and then put together by a composition part 35, and the composite data are reconverted into RGB data to obtain color image data. The color image data are displayed on a display device 34 and certified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a personal identification system using an ID card.

[0002]

2. Description of the Related Art In an ID card (identification card) or passport for certifying the identity of an individual, a photograph of the owner is pasted to authenticate the owner himself. In this case, there is a problem that it is possible to easily forge by replacing the photograph.

In order to solve this problem, Japanese Patent Laid-Open No. 6-1
Japanese Patent No. 55971 proposes an individual authentication system using an ID card in which face photograph information of the owner himself and character information for identifying the owner himself are displayed by a two-dimensional bar code.

In this publication, as shown in FIG. 5, a face photograph 2 and personal information 3 such as name, address, and telephone number are written on the front side of the ID card 1, and the face photograph information of the owner himself is shown on the back side. And two-dimensional bar code 4 that has personal information as data
Is being printed.

The face photograph information and the personal information are read from the two-dimensional bar code 4 printed on the ID card 1 by using the personal authentication system shown in FIG. That is, the two-dimensional bar code 4 printed on the ID card 1 is read by the two-dimensional bar code reader 5, the two-dimensional code decoder 6 decodes it, and the image data and the personal information data are separated from the decoded data and displayed. It is displayed on the device 7 so that the face photograph and personal information of the owner of the ID card 1 can be confirmed.

[0006]

By the way, since image data such as a face photograph has a huge amount of data, it is necessary to perform data compression by image coding in order to display a two-dimensional code having a limited capacity. Conceivable. Since a large data compression rate is required for the compression of image data, a lossy coding method represented by the color still image international standard coding method is suitable for the image coding method. The practical range of the compression rate of the color still image international standard encoding method is usually about 1/10 to 1/30.

When such data compression is used,
The compressed data is read from the two-dimensional code of the ID card, the decoded data is decoded to obtain the reproduced image data, and the reproduced image data is displayed on the monitor or the like to perform the authentication work.

On the other hand, when the two-dimensional code is arranged in a small area such as a part of the ID card, the amount of data stored by the two-dimensional code is about several hundred bytes. When storing color gradation image data represented by 24 bits per pixel (8 bits for each RGB) in a two-dimensional code with a capacity of 400 bytes at a compression ratio of 1/30, the number of pixels of the original image is 4,000 pixels. Becomes When this is used as an image size, it becomes a fairly small image of about 64 × 64 pixels.

With such an image size, the image displayed on the monitor is small, which hinders the authentication work. Further, when the compression ratio is as large as about 1/30, deterioration of the reproduced image is noticeable, and there is a problem in terms of image quality of the displayed image.

Therefore, according to the present invention, the image size of the face photograph to be displayed can be increased by dividing the coded data obtained by image-coding the face photograph information into an ID card and storing each as a two-dimensional code. Provided is a personal authentication system capable of suppressing deterioration in the quality of reproduced images by reducing the compression rate and smoothly performing authentication work.

[0011]

The invention according to claim 1 is
An ID card in which encoded data obtained by dividing the face image information of the owner into a plurality of pieces and image-encoded is stored as a plurality of two-dimensional codes, and a code for reading each two-dimensional code of this ID card and obtaining encoded data respectively A reading unit, a reproducing unit that decodes each coded data obtained by the code reading unit, synthesizes the encoded data, and reproduces the face image information of the owner, and a display that displays the face image information reproduced by the reproducing unit. It consists of means.

According to a second aspect of the present invention, in the first aspect of the invention, the ID card divides the face image information of the owner into a luminance component and a color difference component, and encodes the encoded data into two pieces, respectively. It is to store it as a dimension code.

According to a third aspect of the present invention, in the first aspect of the invention, the ID card divides the face image information of the owner into layers and encodes the encoded data into two pieces.
It is to store it as a dimension code.

[0014]

In the present invention having such a structure, each two-dimensional code is read from the ID card to obtain encoded data.
Then, each coded data is decoded and synthesized, the face image information of the owner is reproduced, and displayed by the display means.

For example, when the face image information is divided into a luminance component and a color difference component and coded data is stored in each of the ID cards as a two-dimensional code, the coded data of the luminance component is stored. A monochrome image is reproduced from the dimensional code, and a colorized image is obtained by reading and synthesizing a two-dimensional code in which coded data of color difference components is stored.

Further, when the encoded data obtained by dividing the face image information into layers and image-encoding is stored as two-dimensional codes in the ID cards, respectively, the face is extracted from the two-dimensional code storing the encoded data of a certain layer. An image of which the outline can be judged is reproduced, and a detailed image is obtained by reading and synthesizing a two-dimensional code in which encoded data of another layer is stored. When the layer is three layers, a more detailed image can be obtained by reading a two-dimensional code in which the encoded data of another layer is stored and combining it.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the construction of an ID card creating system for converting image data into a two-dimensional code and printing out the two-dimensional code. The person 11 is directly photographed by the camera 12 or the face of the person is depicted. By reading the photograph 13 taken by the image scanner 14, a face image of a person is captured as full-color (8-bit RGB each) digital image data. Then, the obtained digital image data is compressed by the image compression unit 15.

The image compression section 15 converts the RGB data into a luminance color difference signal YUV as a pre-processing for compressing the color image data. The YUV conversion is executed by the following equation. Y = 0.299R + 0.587G + 0.114B U = 0.564 (BY) V = 0.713 (RY) YUV conversion separates the luminance signal Y and the color difference signal UV, and then each signal is data. Compress. For data compression, for example, a color still image international standard encoding method is adopted.

The compressed data of the luminance signal Y from the image compression unit 15 is supplied to the first two-dimensional code encoder 16 and the compressed data of the color difference signal UV is supplied to the second two-dimensional code encoder 17.

The first two-dimensional code encoder 16
Encodes the data including the compressed data of the luminance signal Y and character-based personal information such as the name and address of an individual. The second two-dimensional code encoder 17 is
The compressed data of the color difference signal UV is two-dimensionally coded. The two-dimensional coded data by the two-dimensional code encoders 16 and 17 are supplied to the two-dimensional code printer 18, and the printer 18 individually prints the two-dimensional code.

FIG. 2 shows the structure of the ID card 21.
2A shows the front side of the ID card 21, and FIG. 2B shows the back side of the ID card 21. On the front side of the ID card 21, a face photograph 22 and personal information 23 such as name, address, and telephone number are written, and on the back side, compressed data of the luminance signal Y printed by the two-dimensional code printer 18 and personal information. First two-dimensional code 2 in which information is two-dimensionally coded
4 and a second two-dimensional code 25, which is a two-dimensional code of the compressed data of the color difference signal UV, is attached.

FIG. 3 is a block diagram showing the configuration of the personal authentication system. The two-dimensional code 24, 25 attached to the back side of the ID card 21 is read by the two-dimensional code reader 31, and the two-dimensional code is subsequently read. The decoder 32 decodes.

The two-dimensional code decoder 32, when the read two-dimensional code is the first two-dimensional code 24,
The decoded data is separated into image compression data and personal information data, and the image compression data is supplied to the image decompression unit 33 and the personal information data is directly supplied to the display device 34. In addition, the read two-dimensional code is the second
In the case of the dimension code 24, the decoded image compressed data is supplied to the image expansion unit 33.

When the read two-dimensional code is the first two-dimensional code 24, the image expansion unit 33 expands the compressed image data to reproduce the luminance signal image data and supplies it to the display device 34. It is supplied to the synthesizing unit 35. In addition, the read two-dimensional code is the second
In the case of the dimension code 24, the compressed image data is expanded to reproduce the color difference signal image data and supplied to the synthesizing unit 35.

The synthesizing unit 35 synthesizes the luminance signal obtained from the first two-dimensional code and the color difference signal obtained from the second two-dimensional code and inversely converts them into RGB data to obtain color image data. Then, the color image data is supplied to the display device 34.

In the present embodiment having such a configuration, for example, the person 11 is photographed by the camera 12 and the face image of the person is captured as full-color digital image data, that is, RGB data. Then, the captured RGB data is first converted into the luminance color difference signal YUV by the image compression unit 15. Then, it is separated into a luminance signal Y and a color difference signal UV by YUV conversion, and the separated respective signals are data-compressed by a color still image international standard encoding method.

The compressed data of the luminance signal Y from the image compression section 15 is supplied to the first two-dimensional code encoder 16 and the data including the compressed data of the luminance signal Y and character-based personal information such as an individual's name and address. Is two-dimensionally coded. Further, the compressed data of the color difference signal UV from the image compression unit 15 is supplied to the second two-dimensional code encoder 17 to be two-dimensional coded. And each two-dimensional code encoder 1
The two-dimensional coded data in 6 and 17 are supplied to the two-dimensional code printer 18, and the two-dimensional code is printed individually.

In this way, the first two-dimensional code 24, which is a two-dimensional code of the compressed data of the luminance signal Y and the personal information thus obtained,
2D coded compressed data of color difference signal UV and
Each two-dimensional code 25 is attached to the back side of the ID card 21 to create an ID card owned by an individual.

To authenticate an individual, first, the ID
The first two-dimensional code 24 attached to the back side of the card 21 is read by the two-dimensional code reader 31 and decoded by the two-dimensional code decoder 32, and the decoded data is separated into image compression data and personal information data, The compressed image data is supplied to the image expansion unit 33 and the personal information data is supplied to the display device 34. The image decompression unit 33 decompresses the image compression data to reproduce the luminance signal image data, supplies the luminance signal image data to the display device 34, and supplies the luminance signal image data to the synthesizing unit 35.

In this way, the display device 34 displays a monochrome face image from the luminance signal image data and a character string such as name, address, telephone number from the personal information data. The operator authenticates the person on the display screen of the display device 34.

If it is difficult to authenticate with a monochrome image,
Subsequently, the second two-dimensional code 24 attached to the back side of the ID card 21 is read by the two-dimensional code reader 31,
The two-dimensional code decoder 32 decodes. The decoded image compressed data is expanded by the image expansion unit 33 to reproduce the color difference signal image data and supplied to the synthesizing unit 35. In the synthesizing unit 35, the luminance signal obtained from the first two-dimensional code and the color difference signal obtained from the second two-dimensional code are synthesized and inversely converted into RGB data to obtain color image data, which is supplied to the display device 34. .

In this way, the display device 34 displays the color face image and the character string. The operator authenticates the person on the display screen of the display device 34. As described above, the captured color face image information is separated into the luminance signal image data and the color difference signal image data and stored in different two-dimensional codes, and the two two-dimensional codes are read at the time of reproduction to synthesize the obtained image data. Since the original color face image information is restored, the face image information having a relatively large image size can also be stored in the two-dimensional code.
Further, even if the compression rate is reduced, the face image information can be sufficiently stored in the two-dimensional code. Therefore, the image size of the face image displayed on the display device 34 can be increased, and the compression rate can be reduced to suppress the deterioration of the image quality of the reproduced image, and the authentication work can be performed smoothly.

Next, another embodiment of the present invention will be described with reference to the drawings. The same parts as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 4 is a block diagram showing the construction of the ID card producing system. A face image of a person 11 directly photographed by the camera 12 or a photograph 1 by the image scanner 14.
The face image of the person who has read 3 is captured as full-color digital image data, and the data is compressed by the image compression unit 41.

The image compression unit 41 is adapted to perform data compression by a hierarchical encoding system represented by an extended system of the international standard still image encoding system for color still images. For example, it is divided into three layers having different frequency components, the first layer encodes the low frequency components of the image, the second layer encodes the middle frequency components of the image, and the third layer encodes the image components. The high frequency components of are encoded.

The compressed data of the low frequency component from the image compression unit 41 is supplied to the first two-dimensional code encoder 42, and the compressed data of the middle frequency component is supplied to the second two-dimensional code encoder 43. The compressed data of the high frequency component is supplied to the third two-dimensional code encoder 44.

The first two-dimensional code encoder 42 supplies the two-dimensional code printer 18 with the two-dimensional code of the compressed data of the low frequency component including the character-based personal information such as the name and address of the individual. The second two-dimensional code encoder 43 two-dimensionally encodes the compressed data of the middle frequency component and supplies it to the two-dimensional code printer 18, and the third two-dimensional code encoder 44 compresses the high frequency component compressed data. Is converted into a two-dimensional code and supplied to the two-dimensional code printer 18. The two-dimensional code printer 18 includes the two-dimensional code encoders 42, 4
The two-dimensional code is individually printed based on the two-dimensional coded data in 3,44.

Therefore, in this case, three two-dimensional codes are attached to the back side of the ID card. When the face image information is reproduced from this ID card for authentication, first, the first two-dimensional code created based on the compressed data of the low frequency components is read by the two-dimensional code reader and decoded by the two-dimensional code decoder. To do. Then, the decoded data is separated into image compression data and personal information data, and the image compression data is supplied to the image decompression unit and the personal information data is supplied to the display device. The image decompression unit decompresses the image compression data of the low frequency component and supplies the decompressed image data to the display device and the composition unit.

The display device displays the reproduced image of the image compression data of the low frequency component, but if the authentication is difficult with this image, then the second two-dimensional image created based on the compressed data of the intermediate frequency component is displayed. The code is read by a two-dimensional code reader and decoded by a two-dimensional code decoder. Then, the decoded image compression data is supplied to the image decompression unit. The image decompression unit decompresses the image compression data of the middle frequency component and supplies the decompressed data to the synthesizing unit.

In this way, the synthesis unit supplies the display device with the reproduced image data obtained by synthesizing the image compression data of the low frequency component and the image compression data of the middle frequency component. In this way, a more detailed image will be displayed on the display device. This facilitates person authentication. If a more detailed image is desired, the third two-dimensional code created based on the compressed data of the high frequency components is read by the two-dimensional code reader and decoded by the two-dimensional code decoder. Then, the decoded image compression data is supplied to the image decompression unit. The image decompression unit decompresses the image compression data of the high frequency component and supplies the decompressed data to the synthesizing unit.

In this way, the synthesizer supplies the display device with the reproduced image data obtained by synthesizing the image compression data of the low frequency component, the image compression data of the intermediate frequency component and the image compression data of the high frequency component. In this way, a more detailed reproduced image is displayed on the display device.

In this way, the photographed color face image information is separated into low-frequency, middle-frequency, and high-frequency image compression data and stored in different two-dimensional codes, and these two-dimensional codes are read during reproduction, Since the original color face image information is restored by synthesizing the obtained image data, the face image information having a relatively large image size can also be stored in the two-dimensional code. Further, even if the compression rate is reduced, the face image information can be sufficiently stored in the two-dimensional code. Therefore, also in this embodiment, the image size of the face image to be displayed can be increased, and the compression rate can be reduced to suppress the deterioration of the image quality of the reproduced image, and the authentication work can be performed smoothly.

In the above embodiment, when a two-dimensional code is created, the target face image is separated into a luminance signal and a color difference signal to create a two-dimensional code. We have described the method of creating a two-dimensional code by hierarchically dividing the low-frequency, middle-frequency, and high-frequency components. For example, by dividing the target face image into odd-numbered pixels and even-numbered pixels, Good. As a result, the separated image has half the data amount of the original image.

When the pixels are divided into odd-numbered pixels and even-numbered pixels, the two separated images are compressed and stored in a two-dimensional code. Therefore, in this case, there are two two-dimensional codes attached to the ID card. And 1
An image reproduced by reading two two-dimensional codes becomes an image having half the resolution, and when the remaining two-dimensional codes are read in this state, the image of the original resolution combined with the previous image is reproduced. In the case of this example, either of the two two-dimensional codes may be read first.

Even in this manner, the captured color face image information is separated into image compression data of odd-numbered pixels and even-numbered pixels and stored in different two-dimensional codes, and these two-dimensional codes are read at the time of reproduction to obtain them. Since the original color face image information is restored by synthesizing the image data, it is possible to store face image information having a relatively large image size in the two-dimensional code. Further, even if the compression rate is reduced, the face image information can be sufficiently stored in the two-dimensional code. Therefore, even in this case, the image size of the face image to be displayed can be increased, and the compression rate can be reduced to suppress the deterioration of the image quality of the reproduced image, and the authentication work can be performed smoothly.

In each of the above-mentioned embodiments, the photographed color face image information is separated into two or three pieces of image compression data to create different two-dimensional codes, but the present invention is not limited to this. Alternatively, the color face image information may be separated into four or more pieces of image compression data to create different two-dimensional codes.

[0048]

As described above, according to the present invention, the image size of the face image to be displayed can be obtained by dividing the coded data obtained by image-coding the face image information into the ID card and storing each as a two-dimensional code. Can be increased, and the compression rate can be reduced to suppress deterioration in the quality of reproduced images, and authentication work can be performed smoothly.

[Brief description of drawings]

FIG. 1 is a block diagram of an ID card creating system showing an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of an ID card of the same embodiment.

FIG. 3 is a block diagram of a personal authentication system of the same embodiment.

FIG. 4 is a block diagram of an ID card creating system showing another embodiment of the present invention.

FIG. 5 is a diagram showing a configuration example of a conventional ID card.

FIG. 6 is a block diagram showing a configuration example of a conventional personal authentication system.

[Explanation of symbols]

 21 ... ID card 24, 25 ... Two-dimensional code 31 ... Two-dimensional code reader 32 ... Two-dimensional code decoder 33 ... Image expansion unit 34 ... Display device 35 ... Compositing unit

Claims (3)

[Claims] 1. An ID card in which encoded data obtained by dividing the face image information of the owner into a plurality of pieces and image-encoded is stored as a plurality of two-dimensional codes, and each two-dimensional code of the ID card is read and encoded respectively. Code reading means for obtaining the coded data, a reproducing means for decoding the coded data obtained by the code reading means, synthesizing the coded data to reproduce the face image information of the owner, and a face image reproduced by the reproducing means. A personal authentication system comprising: a display unit for displaying information. 2. The ID card stores the encoded image data obtained by dividing the face image information of the owner into a luminance component and a color difference component and image-encoding them, respectively, as a two-dimensional code. Personal authentication system. 3. The ID card stores the encoded image data obtained by dividing the face image information of the owner into layers and storing the encoded image data as a two-dimensional code.
Personal authentication system described.