JPH09251522A - Recorded matter and recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the forgery of a recorded matter by superimposing and recording additional information related with prescribed information on an image for certification as a pattern unrecognizable visually but recognizable through a predetermined method. SOLUTION: A face photograph part 101 of an owner is embedded in an ID card 100, an ID number 102 peculiar for the owner, issuing person name 103 and logo mark 104 of an issuing person or the like are recorded, and a stripe-shaped magnetic recording part 105 is provided. An additional information recording area 106 is set at one part of the face photograph part 101 and in this area 106, the code information of the same mark as the logo mark 104 and the ID number 102 is recorded while being superimposed on the face photograph part 101 as the pattern unrecognizable visually but recognizable through a filter for reproduction. Namely, the recorded contents in the additional information recording area 106 can not be visually recognized but can be visually recognized by covering this area with a filter 108 for reproduction.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an ID with a facial photograph.
The present invention relates to a recorded matter such as a card or a document containing a seal imprint, which is recorded so as not to be easily forged, a recording apparatus for obtaining the recorded matter, and a reproducing apparatus for reproducing information on the recorded matter.

[0002]

2. Description of the Related Art In recent years, the importance of security has increased, and the need for accurately and easily identifying a person has increased. In order to identify a person, a method of examining fingerprints, voiceprints, and retina information has been attempted. Of these, the method by which humans can visually identify and identify facial photographs is the easiest and most reliable method, and facial photographs are often used for identification cards, driver's licenses, passports, and ID cards. However, forgery of ID cards has become a problem with this method.

For example, in the case of an identification card or the like, forgery such as replacement of a face photograph has been conventionally prevented by a treatment such as a tally mark, a laminating process, and an integrated process by a special recording device. However, in recent years, high-performance color scanners, color printers, and the like have become easily available, and by combining with a personal computer, it has become possible to forge an identification card with a facial photograph.

Further, even magnetic cards and IC cards used for credit cards and the like can be plagiarized if they have the knowledge and technology for copying the magnetic recording portion and rewriting the stored contents of the memory. It is becoming less secure. Therefore, even for magnetic cards and IC cards, the simplest and surest way to confirm that the person who owns the card is the original owner is a portrait, which is becoming more important. , As with the ID card, there is a danger of counterfeiting by replacing the face photo.

On the other hand, in Japan, it is customary to put a seal on a document to show that the document has been certified, and it is important to judge whether the seal imprint is a document certified by the original certifier. It is an element. However, it is very difficult for the side that receives the certified document to accurately determine the imprint, and it is extremely inefficient in business processing. In addition, it is not impossible to duplicate imprints by combining them with current high-precision scanners and printers and personal computers. Further, although logo marks are used in documents by some companies, it is now possible to easily reproduce even with these logo marks, increasing the risk of forgery of documents with logo marks.

[0006]

As described above, the ID
Authentication images such as facial photographs on cards and imprints and logo marks on documents can be copied and replaced relatively easily by recent technology. The possibility of forging documents is increasing.

According to the present invention, a recorded material which can effectively prevent forgery due to duplication or replacement of an authentication image, a recording device for obtaining the recorded material, and a reproduction for reproducing information recorded in the recorded material. The purpose is to provide a device.

[0008]

In order to solve the above problems, the present invention provides at least predetermined information on an authentication image and an authentication image of a recorded matter in which predetermined information including characters and symbols is recorded. It is characterized in that the additional information that is the same as or has a relationship with a part is superposed and recorded as a pattern that cannot be visually recognized and can be recognized by a specific method. The recorded matter is, for example, an ID card or other card for personal use, a document having an imprint, or the like, and the authentication image is, for example, a photograph of the original owner of the ID card or the seal of the document settlement person. It is the imprint obtained by. The additional information is, for example, a logo mark or ID written on the ID card.
The number, the name of the person who made the seal on the document, the date and time of the seal, etc., and in the case of a card or IC card with a magnetic recording unit, the information recorded in the magnetic recording unit or IC. Good.

As described above, the additional information, which is the same as, or related to, at least a part of the predetermined information recorded on the recorded matter such as the ID card or the document on the authentication image such as the face photograph or the seal image. Is recorded as a pattern which cannot be visually recognized but can be recognized by a predetermined specific method, the additional information is recognized by this specific method when the information recorded on the recorded matter is reproduced. If so, it can be seen that the recorded material is not forged.

That is, since the additional information superposed and recorded on the authentication image cannot be visually recognized, a third party may copy or replace only the authentication image while recognizing the additional information while recognizing the additional information. Then, it becomes difficult or impossible to forge an ID card with a facial photograph or a document with a seal imprint.

As a method of superimposing and recording the additional information on the authentication image as a pattern which cannot be visually recognized and which can be recognized by a predetermined specific method, for example, (1) the color difference grid pattern is modulated by the additional information. Then, the modulated color difference grid pattern is superimposed and recorded on the authentication image. (2) The high-frequency color difference signal is modulated by the additional information, and the modulated high-frequency color difference signal is superimposed and recorded on the authentication image. , Can be used. In this case, if the additional information is encrypted, for example, the information such as the ID number, the name, and the date is subjected to the signature process based on the cryptographic theory, and then the modulation of (1) or (2) is performed, Counterfeiting is difficult and virtually impossible.

When the additional information is reproduced from a recorded matter in which the additional color information is superimposed and recorded on the authentication image by modulating the color difference grid pattern, the same color difference grid pattern as the specific color difference grid pattern is displayed on the authentication image. It is possible to visually recognize the additional information through the optical filter including the optical filter.

When the additional information is reproduced from the recorded material in which the additional information is superimposed and recorded as the high-frequency color difference signal, the high-frequency color difference signal is detected and decoded from the image signal obtained by reading the authentication image. Additional information can be obtained.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 is a diagram showing an example of an ID card as a recorded matter according to the present embodiment. This ID card 100 includes an ink image of the owner's face photo section 10
1 is embedded and the owner's unique ID number 102,
Information such as the issuer's name 103 and the issuer's logo mark 104 is recorded, and the stripe-shaped magnetic recording unit 105 is further recorded.
Is provided. An additional information recording area 106 is set in a part of the face photograph portion 101 as shown by a broken line, and the same mark as the logo mark 104 and the code information of the ID number 102 are visually recognized in the additional information recording area 106. It is recorded as a pattern that is impossible and can be recognized through a reproduction filter, which will be described later, superimposed on the face photograph portion 101. Thereafter, this additional information recording area 106
The code information of the logo mark and the ID number recorded in 1 is collectively referred to as additional information.

The pattern of the additional information recorded in the additional information recording area 106 is, as schematically shown in detail in FIG. 2, a first grating 201 indicated by an upward arrow and a second grating 201 indicated by an downward arrow. The grid 202 is composed of a color difference grid pattern that is a combination of two types of grids.
The additional information recording area 106 is composed of a logo mark recording section 203 and a code information recording section 204, and the logo mark recording section 203 consisting of the upper six rows has the second grid 202 as a background and the logo mark by the first grid 201. Characters / symbols that represent, in this example, the character "TSB" are recorded.

In the code information recording section 204, which is the bottom line of the additional information recording area 106, the well-known public key cryptosystem is used to sign the binary numbered ID number. Code information is recorded in a color difference grid pattern. The code information will be described later in detail. Further, although the code information recording unit 204 is composed of one line in FIG. 3, it is preferable that the code information recording unit 204 is composed of several lines because the amount of data increases when the signature process is actually performed.

3 (a) and 3 (b) are diagrams showing the details of the first grating 201 and the second grating 202, each of which is divided into an upper half and a lower half. First shown in FIG. 3 (a)
In the grid 201, the blue component is added to the face photograph section 101 in the upper half, and the red component is reduced by that amount, so that there is no change in brightness, and the lower half has the red component on the contrary. It is added to the face photograph portion 101, and the blue component is reduced accordingly, so that there is no change in brightness as in the upper half. In the second lattice 202 shown in FIG. 3B, contrary to the first lattice 201, the red component in the upper half is the facial photograph portion 10.
1 is added, and the blue component is reduced by that amount so that there is no change in brightness. On the contrary, in the lower half, the blue component is added to the facial photograph portion 101, and the red component is correspondingly added. It is also configured so that there is no change in brightness when it is reduced. These first and second grids 201 and 202 are called a color difference grid pattern.

That is, the inks forming the face photograph portion 101 are cyan, magenta, and yellow, and the ink amount signals designating the amounts of these inks are Co (cyan) and Mo.
(Magenta) and Yo (yellow), the face photograph portion 1 is formed in the portions of the first and second gratings 201 and 202.
By adding ± αc, ± αm, and ± αy according to the additional information as shown in the following equation (1) to 01,
The color difference grid pattern is modulated.

C ′ = Co ± αc M ′ = Mo ± αm Y ′ = Yo ± αy (1) However, by adding ± αc, ± αm, and ± αy, the luminance I
= (± αc) + (± αm) + (± αy) does not change, but only the color difference changes. Further, the first grating 201 and the second grating 202 are arranged so that there is no difference in their respective average chromaticities (average chromaticity of the upper half and the lower half), that is, the first grating 201 and the second grating. The color difference between 202 is substantially zero. αc, α
The sign of ± before m and αy is selected according to the additional information to be recorded. In this way, the color difference grid pattern is modulated by the additional information, the modulated color difference grid pattern is added to the original ink amount signals Co, Mo, Yo, and the added ink amount signals C ′, M ′, Y ′. Is supplied to the color printer, the image of the face photograph is recorded in the face photograph portion 101, and at the same time, the additional information is superposed and recorded in the additional information recording area 106 of the face photograph portion 101.

Here, when the face photograph portion 101 and the additional information recording area 106 are recorded by using a color printer having a resolution of 600 dpi, for example, the lattice size is 4 × 4.
If it is a dot, then one grid is 1 vertical and 1 horizontal.
It is composed of 50 lines and has the same level of roughness as a normal halftone dot printed image. Therefore, as described above, the additional information in the additional information recording area 106 is photographed with a face so that there is little or no change in the brightness in the grid and the color difference between the first and second grids 201 and 202 is substantially zero. When superposed on the portion 101, the grid in the additional information recording area 106 and the logo mark and ID number which are the additional information can hardly be visually recognized.

As described above, the recorded content of the additional information recording area 106 cannot be visually recognized, but by covering it with a reproducing filter 108 as shown in FIG.
It can be visually recognized. The reproduction filter 108 shown in FIG. 4 corresponds to the first grating 201 shown in FIG.
Similarly, the upper half is composed of a blue filter and the lower half is composed of a color difference grid filter in which grids of red filters are arranged in a matrix.

When such a reproducing filter 108 is put on the additional information recording area 106, the logo mark recording section 20 is formed.
Since the character portion of 3 is composed of the first lattice 201, the blue filter overlaps the portion where the blue component is added, and the red filter overlaps the portion where the red component is added. The brightness is doubled in each case. On the other hand, since the background portion of the logo mark recording unit 203 is composed of the second grating 202, the red filter overlaps the portion where the blue component is added and the blue filter overlaps the portion where the red component is added. It becomes darker than the character part.

As a result, as shown in FIG. 5 showing a state in which the reproducing filter 108 is overlaid on the additional information recording area 106, the characters of the logo mark "TSB" can be visually recognized. That is, the character portion 211 becomes bright and the background portion 212 becomes dark, so that the characters of the logo mark can be seen. In FIG. 5, the line widths of the grid and the characters are shown to be approximately the same, but in reality, the character width and the size of the code information are much larger than those of the grid, so that they are easy to read with the eyes.

The reproducing filter 108 is shown in FIG.
Instead of the color difference grid filter including the same color difference grid as the first grid 201 shown in (a), a grid similar to 302 of the second grid shown in FIG. 3B, that is, the upper half is a red filter. Alternatively, a lattice filter composed of a color difference lattice whose lower half is a blue filter may be used. In this case, contrary to the above, the character part 211 becomes dark in FIG.
By making 12 bright, the logo mark can be visually recognized in the same manner.

Further, as the reproducing filter 108, a lattice filter in which a black and white lattice having an upper half transparent and a lower half black is arranged in a matrix may be used. When such a reproducing filter is used, in the additional information recording area 106, only the upper half of the lattice passes through the reproducing filter, so that the portion to which the blue component is added can be seen in the character portion 211 and the background portion 212 can be seen. Since the part where the red component is added can be seen, the bluish logo mark appears on the reddish background. In reproducing rough characters such as logo marks, it is more visible to use a black and white grid filter as a reproducing filter. That is, in human visual characteristics, since a color difference is more easily recognized than a difference in light and shade in a low frequency pattern, it is better to convert the pattern in the additional information recording area 106 into color difference information with a black-and-white filter and reproduce it. Easy to see.

Further, in the above description, one grid has two upper and lower parts.
Although they are divided and arranged, the upper half and the lower half may be arranged in a square matrix. As described above, the ID card 100 according to the present embodiment is the owner's face photo section 1
01 in the additional information recording area 106
The same mark as 04 is not visible with normal visual observation, but is superimposed and recorded as a pattern that can be visually recognized only when viewed through the reproduction filter 108 including a specific color difference grid filter, which is effective in preventing counterfeiting of a card. Is. That is, in the ID card 100 of FIG. 1, for the face photograph portion 101, the ID number 102, the issuer name 103, the logo mark 104 and other visible information, a highly accurate color scanner, a color printer, a personal computer and the like are used. As a result, it is possible for a third party, that is, a counterfeiter of the card, to reproduce it relatively easily. It is difficult for a person to reproduce.

Therefore, the reproducing filter 1 as described above is used.
When the recorded content of the facial photograph portion 101 is confirmed using 08, an ID card in which no information is superposed and recorded at a position corresponding to the additional information recording area 106, or information not intended by the issuer ( In the above example, the ID card in which information other than the logo mark and information other than the ID number) is recorded can be easily known to be a forged one.

Further, in the present embodiment, the code information recording section 204 of the additional information recording area 106 records the code information in which the ID number is signed by the public key cryptosystem in the binary number display so that the forgery is almost eliminated. It can be impossible. That is, even if it is a logo mark recorded in the logo mark recording portion 203 of the additional information recording area 106 or a logo mark recorded by using a random pattern and an error diffusion recording system as in an embodiment described later, it is quite appropriate. In principle, it is possible to forge by knowing that the logo mark is recorded in a pattern that is difficult to visually recognize in the logo mark recording unit 203 if a quantitative analysis is performed. Therefore,
In addition to the logo mark recorded in the logo mark recording unit 203, if the code information with the signature of the ID card issuer is recorded in the code information recording unit 204 using the signature technology of the public key cryptosystem, ID card 10 based on public key
It becomes possible for a counter or a user handling 0 to verify that the ID card 100 is not forged.

The code information recorded in the code information recording unit 204 is recorded as follows, for example. Let a be the ID number of each individual who owns the ID card 100, and
Let the public key of the card issuer be (e, n) and the private key be d. The issuer signs the ID number a with the private key d,
That is, encryption is performed. Code information b after this signature processing
Is represented by the following equation (2).

B = ^ad (mod n) (2) Here, (mod n) is a remainder operation of n, and b is a.
Represents the remainder when ^d is divided by n. This code information b is converted into the form of color difference, that is, the pattern of the first grating 201 of FIG. 3A or the pattern of the second grating 202 of FIG. 3B,
It is written in the code information recording unit 204 in FIG.

Next, when verifying the ID card 100, the reproduction filter 108 shown in FIG.
The code information b is visually recognized by making close contact with the D card 100.

Next, the verification as to whether the code information b after the signature processing is forged or not is performed as follows. For example, at the counter of dealing with the ID card 100, performs a modular exponentiation of b ^e (mod n) using a public key that is published from the card issuer (e, n), the original cardholder by this calculation If the ID number a is obtained, it is verified that the ID card was not forged. In this way, the presence or absence of forgery can be verified only by the public key, and since the private key only needs to be stored by the card issuer, there is no leakage and extremely safe operation is possible. Such a signature technique, unless the private key d is leaked,
It is said to be extremely safe because it is almost impossible to decipher even with an astronomical amount of computation.

By recording the code information for which the ID number is signed by the well-known signature technique in the code information recording section 204 of the additional information recording area 106 in the facial photograph section 101, the ID card 100 is obtained. Forgery of is almost impossible. For example, the forger obtains another person's ID card by some method, analyzes the recording pattern of the logo mark in the logo mark recording unit 203, the recording method, etc., and makes it impossible to see the logo mark on the face picture of the forger. Even if a forged ID card (a card with a new name or ID number) written in can be created, it is impossible to forge if the code information b subjected to the signature process cannot be obtained.

Even in this case, the possibility is small, but if the ID number recorded in the code information recording unit 204 could be dead-copied, forgery would be possible. Therefore, by combining with the ID number and signing and writing facial features (round face, face length, etc.) and physical features, even if the physical features are not similar, even if a dead copy is forged. It turns out that it was done. Further, by combining with the ID number and other information, such as the zip code, the date of issue, and the date of birth, it becomes difficult to obtain the code information b that has been subjected to the signature processing, so that more reliable forgery prevention can be achieved. It is also possible to do so.

Further, in order to prevent the forgery more surely, for example, the registration confirmation number (equivalent to the personal identification number) of each user is encrypted and written by the public key of the card issuer, and the secret is kept from the card issuer at the counter. There is also a method of decrypting the confirmation number encrypted with the private key distributed to and confirming it by requesting the confirmation number from the owner of the ID card. In this way, the ID number and the confirmation number are paired and recorded in the code information recording unit 204 of FIG.
Forgery by dead copy can be made impossible.

The logo mark recorded in the logo mark recording section 203 can be visually confirmed by superposing the reproduction filter 108 on the ID card 100 as described above, and visually confirmed in the code information recording section 204. Information recorded in an unrecognizable state is also converted into signature-processed code information b which is visually recognizable when the reproducing filter 108 is placed on the ID card 100. Checking whether the code information b after the signature process is correct, it is possible to perform the modular exponentiation of b ^e (mod n) described above. This power-residue calculation can now be easily realized by a dedicated 1-chip LSI. Therefore,
This dedicated LSI is built into a dedicated computer such as a simple calculator, the code information b subjected to the signature processing is visually recognized, and then the calculation is performed using this computer to obtain the obtained ID.
By checking the number, you can easily check for counterfeit. Further, as will be described later, the code information recording unit 204
It is also possible to optically read the code information b recorded in (1) and calculate the exponentiation remainder to display it.

The contents to be recorded in the additional information recording area 106 of FIG. 1 are not limited to the logo mark and the ID number, and may be a simple graphic pattern such as a circle. When the additional information is reproduced by the reproduction filter 108, such a simple pattern is easier to see.

Next, the ID card 10 in this embodiment.
A recording device for recording 0 in the face photograph portion 101 and the additional information recording area 106 will be described. FIG. 6 is a block diagram showing the configuration of this recording apparatus. The image input unit 301 is mainly composed of, for example, a color scanner,
Information to be recorded in the face photograph section 101 of the ID card 100,
That is, a face photograph of the person who is the owner of the ID card 100 is read as an image, and ink amount signals of Co (cyan), Mo (magenta), and Yo (yellow) are output. The logo data generation unit 302 generates image data (logo data) of the logo mark 104, and the ID number generation unit 303 generates an ID.
Binary code information of number 102 is generated. The logo data from the logo data generation unit 302 is directly input to the color difference conversion unit 305, the code information of the ID number from the ID number generation unit 303 is signed by the signature processing unit 304 as described above, and then the color difference grid is generated. It is input to the modulator 305.

The color-difference grating modulator 305 modulates the color-difference grating pattern with the logo data and the code information of the ID number after the signature processing, and converts it into ± αc, ± αm and ± αy signals. The adder 306 is used by the color difference grating modulator 3
And the ink amount signals Co, Mo, and Yo from the image input section 301 are added to the ink amount signals C ′, M ′, and Y shown in Expression (1). ′ Is generated and output to the color printer 307. This allows
The face photograph portion 101 and the additional information recording area 106 of the ID card 100 are recorded.

Next, referring to FIG. 7, the above ID card 1
A preferred embodiment of a card reading device, which is a reproducing device for reading information on 00 for reproduction, will be described. This card reading device 400 has a card insertion port 4
When the ID card 100 is inserted from 01, the reproduction filter 108 as shown in FIG. 4 is overlapped on the face photograph portion 101 of the ID card 100 as shown in FIG. 8, and the additional information recording area 106 is passed through this reproduction filter 108. The logo mark on the logo mark recording section 203 can be visually recognized through the viewing window 402 on the surface of the main body. Also, so that you can see it even in dark surroundings such as at night,
It is desirable to add a simple lighting means.

The reproduction filter 108 is used as the ID card 100.
When the reproduction is overlaid on the top of the ID card 100, the smaller the gap between the face photograph portion 101 of the ID card 100 and the reproduction filter 108, the better the reproduction can be made. As shown in FIG. It is desirable to arrange so that the surface of the face photograph portion 101 and the surface on which the lattice is patterned are in close contact with each other. Specifically, the ID card 10
The gap between the face photograph portion 101 of 0 and the reproduction filter 108 is the lattice pitch (about 160 μm) of the reproduction filter 108.
m) or less is desirable. However, in the case where the reproduction filter 108 has a simple color difference grid pattern as shown in FIG. 4, there is no problem in aligning the faces of the facial photograph portion 101 and the reproduction filter 108 in this way,
In the case of using a random lattice pattern, which will be described later, the face photograph portion 101 and the reproduction filter 108 may be left-right opposite when faced to each other. In this case, the pattern of the reproduction filter 108 may be reversed so that the reproduction filter 108 is reversed.

The card reading device 400 is provided with a display unit 403 such as a liquid crystal display.
In the display unit 403, the code information on the code information recording unit 204 in the additional information recording area 106 is read as described later, and the verification result of the ID number obtained by performing the modular exponentiation is displayed. In addition, the confirmation number is displayed when the confirmation number is displayed, and the characteristic is displayed when the physical feature that is combined with the ID number and is signed is displayed. By the display, the user of the card reading device 400 can confirm that the owner of the ID card 100 is the original owner and that the ID card is not forged. .

Next, the identification device of the code information on the code information recording section 204 in the card reading device 400 will be described in more detail with reference to FIGS. 9 and 10. In FIG. 9, when the ID card 100 is inserted into the card insertion slot 401 of the card reading device 400 from the direction of the arrow, the red LEDs 411 and 412 illuminate the code information recording unit 204, and the reflected light thereof is detected by the optical sensors 413 and 414. Detected by. At this time, I
On the D card 100, the grid 20 shown in FIGS.
Masks 421 and 422 for selecting 1 or grating 202 are brought into close contact as shown.

FIGS. 10A and 10B are specific examples of the masks 421 and 422. The white parts are transparent parts and the black parts are light shielding parts. In FIG. 10A and FIG. 10B, the mask 421 and the mask 422 are provided with a set of a transmissive part and a light-shielding part for four rows.
This corresponds to the case where 04 is constituted by four lines of the lattice pattern consisting of the lattice 201 or the lattice 202 shown in FIGS. 3 (a) and 3 (b). The code information recording unit 204 is shown in FIG.
When passing under the mask 421 shown in 0 (a),
Similarly, when the upper halves of the gratings 201 and 202 of FIGS. 3 (a) and 3 (b) are selectively illuminated and read and also pass under the mask 422, the gratings 201 and 202 as well.
The lower half will be selectively illuminated and read.

Now, for example, the pattern of the grid 201 in FIG. 3A in the code information recording section 204, that is, the blue / red pattern portion in which blue is added to the upper half and red is added to the lower half is read. Considering such a case, first, the blue pattern is illuminated with red light through the mask 421 for selecting the upper half, and the reading is performed by the optical sensor 413, so that the output of the optical sensor 413 becomes a small value. This blue / red pattern is then illuminated with red light through the red pattern through the mask 422 which selects the lower half, and the light sensor 414
Therefore, the output of the optical sensor 414 has a large value.

On the other hand, of the code information recording section 204, the pattern of the lattice 202 of FIG. 3B, that is, the red / blue pattern portion in which the upper half is added with red and the lower half is added with blue is read. Considering the case, first, since the red pattern is illuminated with red light through the mask 421 for selecting the upper half and the reading is performed by the optical sensor 413, the output of the optical sensor 413 becomes a large value, and then the red / blue. Since the blue pattern is illuminated with red light through the mask 422 that selects the lower half of the pattern and is read by the optical sensor 414, the output of the optical sensor 414 becomes a small value.

Therefore, the sensor 413 is processed by the processing unit 415.
By comparing the output of the sensor 414 with the output of the sensor 414, it is possible to determine whether the pattern to be read by the code information recording unit 204 is the blue / red pattern of FIG. 3A or the red / blue pattern of FIG. 3B. It will be possible. In this way, the code information b of the ID number subjected to the signature processing on the code information recording unit 204 can be read. In the processing unit 415, the code information b read in this way is sent to the cryptographic analysis unit 416 composed of, for example, an RSA (one of public key cryptosystems) dedicated LSI.
The cryptographic analysis unit 416 verifies the signature code, restores the confirmation code, and reproduces the physical characteristics, and the result is processed by the processing unit 41.
Return to 5. The processing unit 415 displays this result on the display unit 40.
Send to 3 and display.

In this way, in the present embodiment, the code information b after the signature processing, which has been converted into a high-definition color difference grid pattern, is easily read without using a high-definition sensor,
It is possible to confirm whether the ID card 100 is a forged one. The code information b may be read by using a high-definition color sensor and the color difference between the upper half and the lower half of the grid may be detected to verify the code information b in the same manner as above.

(Second Embodiment) FIG. 11 is a block diagram showing the arrangement of a recording apparatus according to the second embodiment. In FIG. 11, the same parts as those in FIG. 6 are designated by the same reference numerals, and in the present embodiment, the error diffusion recording system and the random grating modulation are combined, and the reproduction filter has the synergistic effect of the random pattern and the error diffusion recording pattern. This is an example in which it is extremely difficult to examine the structure, and further difficult to forge.

In FIG. 11, the ink amount signal which is the information of the facial photograph portion 101 input from the image input portion 301 is output from the adder 311, the quantizing portion 312, the subtractor 313, the error diffusion processing portion 314 and the color printer 307. Will be sent to the error diffusion recording system. On the other hand, the logo data generation unit 302
The logo data from is directly input to the random lattice modulation unit 315, the code information of the ID number from the ID number generation unit 303 is signed by the signature processing unit 304 as in the previous embodiment, and then the random lattice modulation is performed. It is input to the unit 315.

The random lattice modulation unit 315 modulates a random lattice pattern by the logo data and the code information of the ID number after the signature processing. Specifically, for example, the pseudo random lattice information is generated by the M-sequence code, Similar to the case of the regular grid, information is generated by modulating the random grid with the red component emphasis signal and the blue signal emphasis signal so as to correspond to the upper and lower patterns.

In this way, the random grating modulator 315
The random lattice modulation signal obtained in step S3 is added to the image signal of the facial photograph after the error diffusion signal is added in the adder 311 in the adder 316, and then the multivalue output of the color printer 307 is performed by the quantizer 312. Quantized according to the possible number,
It is input to the color printer 307. For example, if the color printer 307 is a binary printer, the quantizer 312
Then, binary quantization is performed. According to human visual characteristics, the quantization unit 312 has a resolution of 600 dpi,
A good image can be obtained by quantizing at least 16 values with a resolution of 300 dpi or more. Then, an error signal between the signal input to the color printer 307 and the output signal of the adder 311 is obtained by the subtractor 313, and this error signal is a known error composed of a line memory, a diffusion coefficient table, a multiplier and the like. The error diffusion signal is generated by being input to the diffusion processing unit 314, and this error diffusion signal is added by the adder 31.
At 1, it is added to the image signal of the face photograph from the image input unit 301.

As described above, in the present embodiment, the random lattice modulation section 315 modulates the random lattice pattern with the logo data and the code information of the ID number subjected to the signature processing, and then the pseudo-gradation is performed in the error diffusion recording loop. The image is processed and recorded by the color printer 307. In this error diffusion system, the error is calculated as the difference between the signal in which the error is added to the image signal of the face photograph and the signal input to the color printer 307, and the error diffusion loop works so as to minimize this error. . That is, the main component (near the DC component) of the recorded signal approaches the image of the face photograph.

On the other hand, the logo data and I modulated by the random lattice added immediately before the quantization in the quantizer 312 and I
The code information of the D number becomes a recording signal due to the local response of the quantizing unit 312 and is recorded by the color printer 307, but the DC component or the like is not recorded.

In this way, the additional information such as the logo data and the code information of the ID number, which are superposed and recorded on the face photograph portion 101, are detected in the same manner as the decoding of the signal obtained by modulating the regular color difference grid pattern with the additional information. Is reproduced by stacking a reproducing filter having the same random lattice pattern as the random lattice pattern modulated by the additional information. That is, the reproduction filter is created by the random lattice modulation unit 315 in a random lattice pattern that is not modulated by the logo data or the code information of the ID number. In this case, as described above, it is desirable that one of the patterns of the facial photograph portion 101 and the reproduction filter is left-right reversed.

When the subtractor 313 performs subtraction,
Instead of the output signal of the quantizer 212, the color printer 30
If the recording signal when the signal input to the recording medium 7 is actually recorded is estimated and the estimated recording signal and the output signal of the adder 311 are subtracted, recording with higher reproducibility is possible. Become. This method is particularly effective when there is blurring of image points and there is a difference between the signal input to the color printer 307 and the actual recording signal.

Next, the effect of this embodiment will be described. First
When the regular lattice pattern is modulated by the additional information in the color difference lattice modulation unit 305 as in the embodiment of FIG.
Unless the additional information (logo data or code information of the ID number) superposed and recorded in the additional information recording area 106 of No. 1 is random, the configuration of the reproduction filter 108 is clarified only by examining the pattern of the recorded additional information. Will end up. That is, the rule of the lattice forming the reproduction filter 108 is clarified by checking the lattice points where the additional information is expected to change little. However, when the random color difference grid pattern is modulated by the additional information as in the present embodiment, even if the rule of the grid at that position is found by examining the grid expected to have little change in the additional information, It is impossible to decipher the rule of the grid at the position where the additional information that is actually needed changes drastically.

Furthermore, when a fluctuation component from the error diffusion loop, which is a pseudo gradation process having a size approximately the same as the size of the random lattice as in the present embodiment, enters, even if the additional information changes little. Even at position, it is difficult to break the rules of the random lattice. Further, since the fluctuation of error diffusion also depends on the image signal, it is difficult to decode the random lattice even if a large number of recording samples are obtained.

(Third Embodiment) FIG. 12 is a block diagram showing the arrangement of a recording apparatus according to the third embodiment. The present embodiment is a means for recording additional information, particularly code information of an ID number, in a pattern that cannot be visually recognized, for example, by converting the additional information into a high-frequency color difference signal as described in JP-A-7-123244. The method of recording is used. In other words, the signature information is superimposed on the entire face photograph in such a manner that it cannot be visually observed, so that the forgery of the face photograph is more completely prevented.

12, in FIG. 11, the same parts as those in FIG. 6 are designated by the same reference numerals, and the logo data from the logo data generator 202 is input to the color difference grating modulator 305, which is the same as the first embodiment. Similarly, the color difference grid pattern is modulated. This modulated color difference grid pattern is added to the adder 3
At 06, the image signal of the face photograph is added. On the other hand, the code information of the ID number from the ID number generation unit 303 is input to the high-pass color difference modulation unit 321 after the signature processing unit 304 performs the signature processing as described above.

The high-range color-difference modulator 321 modulates the high-range color-difference signal according to the input code information of the ID number after the signature process. Details of this modulation processing are described in JP-A-7-1232.
44. Here, a method in which the high-frequency color difference signals are bit-arranged on concentric circles is adopted.
The high-range color difference signal thus modulated is converted into an ink amount signal by the ink amount signal conversion unit 322, then added to the ink amount signal output from the adder 306 in the adder 323, and input to the color printer 307. It

The high-range color-difference signal output from the high-range color-difference modulating section 321 is a minute signal that does not cause the image quality deterioration of the face-photograph section 101. It does not deteriorate the image. Further, by utilizing the property that a high-frequency color difference component is hardly contained in a normal image, it is possible to record a high-frequency color difference signal even in a portion where the image changes drastically. However, it is difficult to record a high-range color difference signal in a white portion, black portion, or a portion including solid portions of respective colors.

Therefore, in this embodiment, the high-range color difference modulator 3
At 21, the code information of the ID number is coded by the presence or absence of multiple high frequency bands, that is, it is recorded as a wave signal with the same content on the entire surface of the image like a hologram. And
The reproduction is performed by the Fourier transform of the high color difference signal of a part of the image, so that the additional information can be reproduced from a part of the image.

FIG. 13 is a block diagram showing the structure of the reproducing apparatus according to this embodiment. With the recording device of FIG.
The information recorded in the face photograph section 101 on the D card 100 is read by the color scanner 501 and an image signal is output. That is, in the present embodiment, the face photo unit 10
Since the high-frequency color-difference signal superimposed on 1 as additional information cannot be reproduced only by placing it on the reproduction filter ID card 100 as in the first embodiment, the image of the face photograph part 101 is thus obtained by the color scanner 501. Is read and output as an image signal.

In the image signal of the face photograph section 101 output from the color scanner 501, a high frequency band color difference signal is detected by the detection processing section 502 and further decoded by FFT (Fast Fourier Transform) to obtain a bit signal,
That is, the code information of the ID number after the signature process is reproduced. The code information after this signature processing is the verification processing unit 503.
In the same manner as the above, after being decrypted by the public key, the ID number written on the ID card 100 in the collating section 504 and the magnetic recording section 10 provided in association with the ID number are provided.
5, the read signal from the ID card 5, a read signal from the built-in IC when the ID card 100 is a card with a built-in IC, and a signal obtained from the network. This collation makes it possible to confirm that there was no fraud such as forgery.

As described above, in the present embodiment, the face photograph portion 10
Since the code information after the signature processing converted into the high-frequency color difference signal is superimposed on the entire surface of 1, it is extremely difficult to forge the ID card by replacing only the face photograph unless the code information can be created. Therefore, I will be used more often in the future.
Even if it is an ID card that is extremely difficult to counterfeit, such as a card with a built-in C, considering that a face photograph is the most effective means to prove that the user is the person himself Can be said to be an extremely effective embodiment.

(Modifications of First to Third Embodiments) First to First
In the third embodiment, the ID number 10 is displayed on the ID card 100.
2 is written in a visible form, and the user verifies the code information b after the signature processing recorded in the additional information recording area 106 by the user at the handling window, that is, the ID number 102 written on the ID card 100. Although the matching is confirmed, it is not always necessary to confirm it in correspondence with the information written on the ID card 100. For example,
By recording secret information in the magnetic recording unit 105 and checking the coincidence with the information, confidentiality and handling can be further facilitated. Specifically, for example, if the forgery prevention by the confirmation number described above or the like is not asked to the owner, it can be confirmed by checking the coincidence with the confirmation number recorded in the magnetic recording unit 105. It is possible to determine whether or not the ID card 100 has been counterfeited simply by confirming that the face photograph is similar to the holder of the ID card 100 at the counter.

Further, the card reading device 400 may be connected to a database that manages the ID card via a network, particularly a wireless network. In that case, the owner of the ID card 100 can check the read result against the database. It is possible to confirm whether or not the owner is the original owner, for example, processing such as confirmation number.

Further, in the above embodiments, a specific area of the face photograph portion 101, that is, the additional information recording area 1
The additional information (logo mark and code information) is superimposed and recorded on 06 as a pattern that cannot be visually recognized. Is suitable. In addition, regarding the code information of the ID number subjected to the signature processing in particular, instead of recording the additional information in the specific area in this manner, the same additional information is recorded almost uniformly over the substantially entire surface of the face photograph portion 101. However, it is even more effective in preventing forgery.

By the way, in the above description, (1) ID
A logo mark or the like is superimposed and recorded as a pattern that cannot be visually recognized on the additional information recording area 106, which is a specific portion of the facial photograph portion 101 of the card 100, and it is visually confirmed by a reproducing filter to prevent forgery. (2) Superimposing the code information of the ID number, which has been subjected to the signature processing using the signature technique based on the cryptographic theory, in the additional information recording area 106 of the face photograph portion 101 as a visually unrecognizable pattern as in (1). A level at which the presence or absence of forgery or the like is confirmed by recording and visually confirming with a reproduction filter, or by performing arithmetic operation with a simple reading device, and (3) over almost the entire face photograph portion 101 (2) Similarly, there is a level of preventing forgery by superimposing and recording the code information of the ID number for which the signature processing is performed, and the difficulty of tampering is (1) →
It becomes higher as (2) → (3). However, in actual operation, it is not always necessary to carry out the operation up to the level of (3), and any level of (1), (2), and (3) or up to the level of (2) may be used. It is possible to appropriately determine which level or up to what level according to the above.

(Fourth Embodiment) Next, an embodiment in which the present invention is applied to a document having a seal stamped thereon will be described. Currently, in general, offices such as companies and government offices settle important documents by authentication with a seal stamp, but with the development of networks, systems are being considered for approval by circulation by e-mail. As such a so-called electronic approval system, a system in which only a specific person can sign and imprint using a password is considered.

In this case, security is maintained to some extent because the closed system manages the password and the seal imprint, but when the imprint etc. is once output in hard copy, the security is not necessarily maintained. There is a possibility that you will not get drunk. Of course, even in a closed system, if a person who has a thorough knowledge of the security system has malicious intent, the security cannot be maintained. Generally, such a system is devised so that it is difficult to tamper with it without leaving evidence.

By the way, in general, when a hard copy output of an imprint etc. is performed, if a high-precision color scanner or color printer is used as described in the above embodiment,
It allows forgery of hard copies on electronic approval systems with little evidence. In the present embodiment, even if such a hard copy is used, it is difficult to forge a document by plagiarizing a seal imprint.

FIG. 14 shows a document 600 having a seal imprint 601.
Here is an example. FIG. 15 is an enlarged view of the seal imprint 601. In the present embodiment, tampering is prevented by printing and recording the imprint 601 with a recording device as shown in FIG. The system shown in FIG. 16 has a CPU 701,
Imprint data generation unit 702, additional information recording unit 703, RSA processing board 704 that is an encryption processing unit, file memory 705, color scanner 706, and color printer 7.
07 are connected by a bus 708, which is connected to a network, preferably a wireless network 709.

When the imprint 601 is printed, the CPU 7
From 01, the guard of imprint data is removed with a password, and the imprint data output from the imprint data generation unit 702 is transferred to the color printer 707. The seal imprint data is image data obtained by previously reading an actual seal imprint with the color scanner 706. At this time, the additional information such as the name of the person who imprints the stamp and the date and time when the imprint is used are signed by the RSA processing board 704 as in the previous embodiment, and then the imprint output from the imprint data generating section 702. The data is superimposed and sent to the color printer 707. It should be noted that if a signature such as a checksum code of the body of the document 600 is additionally signed as additional information, it is useful for verifying whether the body has been tampered with.

When the additional information is superimposed on the imprint data,
For example, similar to the third embodiment, the additional information is converted into a high-frequency color difference signal so as to be superimposed on the entire imprint data in a form that cannot be visually recognized. Although the imprint data and the additional information are generated separately in FIG. 16, they may be stored in the file memory 705 collectively. If the CPU 701 is a processor capable of high-speed processing, the signature processing may be performed by the CPU 701 without using the dedicated RSA processing board 704.

In this way, the name of the person who signed the imprint data in an invisible form, the date, the checksum code of the text, etc. are superimposed and recorded, and a hard copy is output.
The document obtained in this way looks like a normal document at first glance, but this is similar to the previous embodiment.
By reading in 6, the color difference signal is converted by the CPU 701, and further FFT is performed, the additional information after the signature processing can be obtained. From this additional information signal, the RSA processing board 704 or the CPU 701 performs verification processing by public key cryptography as in the third embodiment, thereby verifying that the person has signed the signature. Moreover, if the checksum code of the text is added, it is possible to verify whether the code has been tampered with. In this way, security is maintained even for a document output as a hard copy from a closed electronic payment system.

In the case of documents requiring settlement by a plurality of settler's seals, the security in that case is devised in each system in the closed electronic settlement system, but in a system that partially uses hard copy. ,
You can do the following:

In FIG. 16, the imprint on the document is read by the color scanner 706, verification is performed with the public key of the first settlement person, and if the document is a true document, the next authorizer authenticates. Also in this case, as in the first marking process, the guard of the imprint data is removed with the password, the signature process is performed with the additional information, and then the signature data is sent to the color printer 707 for printing. At this time, if the previously signed name or the like is added to the additional information, a more hierarchical marking system is provided, and the safety of security is increased. In this way, even if a document is output in hard copy during the electronic payment system, security can be maintained.

Although the example using the color scanner 706 and the color printer 707 has been described in FIG. 16, the present invention can be applied to the case where a monochrome scanner and printer are used. For example, in FIG. 15, the additional information 601 is recorded on the seal imprint 600 so as not to be visually recognized by the monochrome printer. The additional information is encoded and recorded in the dot length and position on the background of the seal “Yamada”. Any additional information encoding method may be used as long as it can be easily read by a scanner.
Further, it is more preferable to add an error correction code to the additional information in order to improve reliability.

Further, in the above embodiment, the additional information is superposed and recorded on the imprint 600, but in the case of a document having a background image such as a pattern, the additional information may be superposed and recorded on the background image. .

[0082]

As described above, according to the present invention, in a recorded matter in which predetermined information including an authentication image such as a face photograph and a seal imprint and characters and symbols is recorded, the predetermined information is recorded on the authentication image. By superimposing and recording the related additional information as a pattern that cannot be visually recognized and that can be recognized by a specific method, it is possible to forge a recorded product by duplicating or replacing the authentication image, specifically, to include a facial photograph. It is possible to effectively prevent the forgery of documents that have been settled by the ID card or the seal.

[Brief description of drawings]

FIG. 1 is a diagram showing an ID card according to a first embodiment.

FIG. 2 is a diagram schematically showing details of an additional information recording area in FIG.

FIG. 3 is an enlarged view of two lattices in FIG.

FIG. 4 is a diagram schematically showing a reproduction filter.

FIG. 5 is a diagram showing a state in which a logo mark recorded in an additional information recording area is reproduced by a reproduction filter.

FIG. 6 is a block diagram showing the configuration of a recording apparatus according to the first embodiment.

FIG. 7 is an external view of a card reading device that is a reproducing device according to the first embodiment.

FIG. 8 is a diagram showing a state in which a reproduction filter is placed on an ID card.

FIG. 9 is a diagram showing a configuration of an identification device of a code information recording unit in the card reading device according to the first embodiment.

10 is a diagram showing a configuration of two masks in FIG.

FIG. 11 is a block diagram showing a configuration of a recording device according to a second embodiment.

FIG. 12 is a block diagram showing a configuration of a recording device according to a third embodiment.

FIG. 13 is a block diagram showing a configuration of a playback device according to a third embodiment.

FIG. 14 is a diagram showing an example of a document having a seal imprint that is a recorded matter according to a fourth embodiment of the invention.

FIG. 15 is a diagram showing the seal imprint according to the fourth embodiment and additional information superimposed and recorded on the seal imprint by a monochrome printer.

FIG. 16 is a block diagram showing a configuration of an electronic payment system using a seal imprint according to a fourth embodiment.

[Explanation of symbols]

 100 ... ID card 101 ... Face photo section 103 ... Issuer name 104 ... Logo mark 105 ... Magnetic recording section 106 ... Additional information recording area 107 ... Additional information recording area 108 ... Playback filter 201 consisting of color difference grid pattern ... First Lattice 202 ... Second lattice 203 ... Logo mark recording section 204 ... Code information recording section 211 ... Character section 212 ... Background section 301 ... Image input section 302 ... Logo data generating section 303 ... ID number generating section 304 ... Signature processing section 305 Color difference lattice modulation unit 306 Adder 307 Color printer 311 Adder 312 Quantization unit 313 Subtractor 314 Error diffusion processing unit 315 Random lattice modulation unit 316 Adder 321 High range color difference modulation unit 322 ... Ink amount signal conversion unit 323 ... Adder 400 ... Card reading device 401 ... Card insertion port 402 ... Window for viewing 403 ... Display section 411, 412 ... LED 413, 414 ... Optical sensor 415 ... Processing section 416 ... Cryptographic analysis section 421, 422 ... Mask 501 ... Color scanner 502 ... Detection processing section 503 ... Verification processing section 504 ... Collating unit 600 ... Document 601 ... Imprint 602 ... Additional information 701 ... CPU 702 ... Imprint data generating unit 703 ... Additional information generating unit 704 ... RSA keyboard 705 ... File memory 706 ... Color scanner 707 ... Color printer 708 ... Bus 709 ... Network

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Claims (7)

[Claims] 1. An authentication image and a recorded matter in which predetermined information including characters and symbols are recorded, and additional information having the same or relevance as at least a part of the predetermined information is provided on the authentication image. A recorded matter, which is superposed and recorded as a pattern which cannot be visually recognized and which can be recognized by a predetermined specific method. 2. A recording device for obtaining a recorded matter in which an authentication image and predetermined information including characters and symbols are recorded, wherein at least part of the predetermined information is the same or related on the authentication image. A recording apparatus, comprising: a unit that superimposes and records additional information having property as a pattern that cannot be visually recognized and that can be recognized by a predetermined specific method. 3. A recording device for obtaining a recorded matter in which predetermined information including characters and symbols and an authentication image are recorded, wherein a color difference is caused by additional information which is the same as or has a relationship with at least a part of the predetermined information. A recording apparatus comprising: a modulation unit that modulates a lattice pattern, and a unit that superimposes and records the color difference lattice pattern modulated by the modulation unit on the authentication image. 4. A recording apparatus for obtaining an authentication image and a recorded matter in which predetermined information including characters / symbols is recorded, which is enhanced by additional information having the same or relevance as at least a part of the predetermined information. A recording apparatus comprising: a modulation unit that modulates the color difference signal and a unit that superimposes and records the high color difference signal modulated by the modulation unit on the authentication image. 5. The recording apparatus according to claim 2, wherein the additional information is input to the modulating means after being encrypted. 6. An authentication image and predetermined information including characters and symbols are recorded, and the additional information having the same or relevance as at least a part of the predetermined information is added to the authentication image. A reproduction device for reproducing the additional information from a recorded matter in which a specific color difference grid pattern is modulated by information and superposed and recorded as a pattern that cannot be visually recognized, and the specific information is arranged on the authentication image. A reproducing apparatus having an optical filter having the same color difference grid pattern as the color difference grid pattern. 7. An authentication image and predetermined information including characters and symbols are recorded, and additional information having the same or relevance as at least part of the predetermined information is recorded on the authentication image in a high frequency band. From the recorded material that was superimposed and recorded as a color difference signal,
A reproducing apparatus for reproducing the additional information, wherein the image reading unit reads the authentication image and outputs an image signal, and the high-frequency color difference signal is detected and decoded from the image signal output from the image reading unit. And a means for reproducing the additional information.