WO2021100974A1

WO2021100974A1 - Security document using secure color pattern, and copy prevention method using secure color pattern

Info

Publication number: WO2021100974A1
Application number: PCT/KR2020/002689
Authority: WO
Inventors: 이재권; 민병권; 김옥수; 장익선; 김옥진; 박찬영; 박진학
Original assignee: 대한민국(국방부 국군인쇄창장)
Priority date: 2019-11-22
Filing date: 2020-02-25
Publication date: 2021-05-27
Also published as: KR102092282B1; KR20210063184A; KR102288423B1

Abstract

The present invention relates to a security document using a secure color pattern, and a copy prevention method using the secure color pattern. A security document using a secure color pattern, according to a first embodiment of the present invention, comprises: a first region, of a printing surface, on which document contents are printed; and at least one second region, of the printing surface, on which a first secure color pattern including a plurality of first colors is formed, wherein the document contents are copied by a copier according to the result of sequentially comparing each of the plurality of first colors to each of a plurality of second colors forming a second secure configuration pattern preset to the copier, each of the plurality of first colors and each of the plurality of second colors are configured to have a lightness index L* value, a chromaticness index a* value, and a chromaticness index b* value in a CIE L*a*b* color space, and the document contents are copied by the copier only when the lightness index L* value, the chromaticness index a* value, and the chromaticness index b* value for each of the plurality of first colors are the same as the lightness index L* value, the chromaticness index a* value, and the chromaticness index b* value for each of the plurality of second colors or are set within a predetermined range.

Description

Secure document using secure color pattern and copy protection method using secure color pattern

The present invention relates to a security document using a security color pattern and a copy protection method using a security color pattern, and more particularly, to a security document that can easily prevent copying of a security document and improve the security level of the security document. The present invention relates to a security document using a color pattern and a copy protection method using a security color pattern.

In general, documents such as technical information, drawings, official documents, etc. created inside a company or public institution can be distributed as digital documents, data, or analog paper documents printed offline.

In particular, an analog document printed off-line (hereinafter, collectively referred to as'document' in the present invention) is a copying device such as a copier, a scanner, and a multifunction device (hereinafter, collectively referred to as a'copier' in the present invention). It is copied or scanned (hereinafter referred to as'copy' in the present invention) and can be easily distributed.Therefore, the confidentiality of companies or public institutions may be leaked due to illegal distribution, etc. In the process, since a duplicate or modified copy identical to the original can be easily created, various technologies have been developed to prevent illegal leakage, distribution, and reuse of such documents.

Looking at the prior art related to the security of such a document, there is a method of making the latent image pattern hidden when copying the original document appear, or, conversely, preventing the pattern displayed on the original from appearing on the copy.

However, this method can only determine whether the document is an original or a copy, that is, whether the original document is illegally copied, such as scanning, copying, or photographing, but is not a method of preventing the copying of the document. There was a problem that it was not possible to prevent the leakage, distribution and reuse of the product.

In order to solve this problem, when printing a document, an indicator including whether or not the document is allowed to be copied is printed together, and when the document is copied with a copier, the indicator included in the document is recognized, and the recognition result is displayed. Accordingly, technologies for allowing or preventing the copying of documents are being developed.

For example, Korean Patent Registration No. 10-1180053 (copying device with copy protection function and its copy protection method) (announced on September 4, 2012) prevents copying from pre-stored patterns included in scanned documents. After detecting patterns corresponding to a pattern, a technique for preventing a printing operation on a document is disclosed if the ratio between the detected patterns matches the ratio of the copy protection pattern.

However, the copy protection technology disclosed in the patent publication is a technology for preventing copying by using the ratio of the detected patterns and the copy protection pattern even when copying by reducing or expanding a document, but due to the development of various printing pattern technologies. There is a problem in that there is a limitation in preventing copying of documents only by the ratio of detected patterns.

In addition, in the case of the copy protection technology disclosed in the patent publication, patterns included in a document can be easily stolen from patterns included in other documents. There was a problem that copying could not be completely blocked.

Accordingly, there is a need for a secure document and a copy protection method that can easily prevent copying of a secure document and improve the security level for the secure document.

The present invention was invented to improve the above-described problem, and the problem to be solved by the present invention is that each of a plurality of colors constituting a security color pattern is assigned a brightness index L* value in a CIE L*a*b* color space. , By having a chromaticness index a* value and a chromaticness index b* value, a security color that can easily prevent copying of a security document by a security color pattern and improve the security level of the security document. It is to provide a secure document using a pattern and a copy protection method using a secure color pattern.

The technical problem of the present invention is not limited to those mentioned above, and another technical problem that is not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a security document using a security color pattern according to a first embodiment of the present invention includes, among a printing surface, a first area in which document contents are printed; And at least one second area of the printing surface on which a first security color pattern composed of a plurality of first colors is formed, wherein the document content includes each of the plurality of first colors, and a second preset in the copier. According to the result of sequentially comparing each of the plurality of second colors constituting the security setting pattern, copied by the copier, each of the plurality of first colors and each of the plurality of second colors are CIE L*a* It is set to have a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value in the b* color space, and the document content is a brightness index L* for each of the plurality of first colors. A value, a chromaticness index a* value, and a chromaticness index b* value, the brightness index L* value, the chromaticness index a* value, and the chromaticness index b* value for each of the plurality of second colors It is characterized in that it is copied by the copier only when the same or set within a predetermined range.

In addition, a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value for each of the plurality of first colors are the brightness index L* values for each of the plurality of second colors, chroma When set to deviate from a predetermined range from the value of the tickness index a* value and the value of the chromaticness index b*, the copier outputs content different from the document content.

On the other hand, in order to achieve the above object, a copy protection method using a security color pattern according to a first embodiment of the present invention includes the steps of: receiving a copy command for a document; Extracting a first security color pattern composed of a plurality of first colors from the document; Determining whether to allow copying of the document by sequentially comparing each of the plurality of first colors with each of the plurality of second colors constituting a second security setting pattern preset in a copier; And when it is determined that copying is permitted for the document as a result of the determination, controlling the copier to copy the document, wherein each of the plurality of first colors and each of the plurality of second colors are CIE It is set to have a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value in the L*a*b* color space, and determining whether to allow copying of the document, The brightness index L* value, chromaticness index a* value, and chromaticness index b* value for each of the plurality of first colors are the brightness index L* value, chromaticness for each of the plurality of second colors When the value of the index a* and the value of the chromaticness index b* are equal to or are set within a predetermined range, it is determined that copying is permitted for the document.

Further, as a result of the determination, when it is determined that copying is not permitted for the document, the copier outputs a content different from the document content.

Meanwhile, in order to achieve the above object, a security document using a security color pattern according to a second embodiment of the present invention includes, among a printing surface, a first area in which document contents are printed; The printing surface includes at least one second area composed of a plurality of colors and in which a security color pattern including first security information regarding whether the document content is secured is formed, and each of the plurality of colors is CIE L It is set to have a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value in the *a*b* color space, and the first security information is It is set by combining a plurality of unit characters preset for the brightness index L* value, the chromaticness index a* value, and the chromaticness index b* value, and the document content includes the first security information set in advance in the copier. It is characterized in that it is copied by the copier only when the second security information is the same.

In addition, when the first security information is not the same as the second security information, the copying machine may output content different from the document content.

As an example, each of the plurality of unit characters is a syllable, alphabet, and number of Hangul preset for the brightness index L* value, the chromaticness index a* value, and the chromaticness index b* value for each of the plurality of colors. And special symbols.

As another example, in the case of a unit character that is a syllable of Hangul among the plurality of unit characters, a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value are respectively in the initial, neutral, and final sound of the syllable. It characterized in that it is set.

In another example, each of the plurality of unit characters may include a phoneme, alphabet, and/or Korean phoneme preset for a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value for each of the plurality of colors. It is characterized in that it is any one of numbers and special symbols.

On the other hand, in order to achieve the above object, a copy protection method using a security color pattern according to a second embodiment of the present invention includes the steps of: receiving a copy command for a document; Extracting a security color pattern composed of a plurality of colors from the document and including first security information regarding whether or not the document is secured; Determining whether the first security information is the same as second security information preset in a copier; And when the first security information is the same as the second security information as a result of the determination, controlling the copier to copy the document, wherein each of the plurality of colors is a CIE L*a*b* color. It is set to have a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value in space, and the first security information includes a brightness index L* value for each of the plurality of colors, It is characterized in that it is set by combining a plurality of unit characters previously set for the chromaticness index a* value and the chromaticness index b* value.

Details of other embodiments are included in the detailed description and drawings.

According to the security document using the security color pattern and the copy protection method using the security color pattern according to embodiments of the present invention, each of a plurality of colors constituting the security color pattern is converted to brightness in a CIE L*a*b* color space. By having an index L* value, a chromaticness index a* value, and a chromaticness index b* value, copying of a secure document can be easily prevented by a security color pattern and the security level for the secure document can be improved. I can.

In addition, according to the security document using the security color pattern and the copy protection method using the security color pattern according to embodiments of the present invention, the brightness index L* value in the CIE L*a*b* color space, the chromaticness index By creating security information by combining a plurality of unit characters set for each of a plurality of colors having an a* value and a chromaticness index b* value, copying of a security document can be easily prevented by a security color pattern. The security level for security documents can be further improved.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a block diagram schematically showing the configuration of a document copy management system for implementing a copy protection method using a security color pattern according to a first embodiment of the present invention.

2 is a diagram showing an example of a secure document used in the document copy management system according to the first embodiment of the present invention.

3 is a diagram illustrating an example of a first security color pattern formed on a secure document used in the document copy management system according to the first embodiment of the present invention.

4 is a flowchart illustrating a method of preventing copying using a security color pattern in the document copy management system according to the first embodiment of the present invention.

5 is a diagram illustrating a state in which a copy determination unit constituting the document copy management system according to the first embodiment of the present invention determines whether to allow copying.

6 is a flowchart illustrating a modified example of a copy protection method using a security color pattern in the document copy management system according to the first embodiment of the present invention.

7 is a block diagram schematically showing the configuration of a document copy management system for implementing a copy protection method using a security color pattern according to a second embodiment of the present invention.

8 is a flowchart illustrating a method of preventing copying using a security color pattern in the document copy management system according to the second embodiment of the present invention.

9 is a diagram illustrating various examples in which a copy determination unit constituting a document copy management system according to a second embodiment of the present invention generates first security information from a security color pattern.

10 is a diagram illustrating an example of a color mapping table used when a copy determination unit constituting a document copy management system according to a second embodiment of the present invention generates first security information from a security color pattern.

11 is a diagram illustrating a state in which a copy determination unit constituting a document copy management system according to a second embodiment of the present invention determines whether to allow copying.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention.

In describing the embodiments, descriptions of technical contents that are well known in the technical field to which the present invention pertains and are not directly related to the present invention will be omitted. This is to more clearly convey the gist of the present invention by omitting unnecessary description.

For the same reason, some elements in the accompanying drawings are exaggerated, omitted, or schematically illustrated. In addition, the size of each component does not fully reflect the actual size. The same reference numerals are assigned to the same or corresponding components in each drawing.

Hereinafter, the present invention will be described with reference to the drawings for explaining a security document using a security color pattern and a copy protection method using a security color pattern according to embodiments of the present invention.

1, the document copy management system 100 according to the first embodiment of the present invention includes a document input unit 110, a pattern extraction unit 120, a copy determination unit 130, and a copy control unit 140. It can be configured to include.

Such a document copy management system 100 may be provided inside or outside the copier 20 for copying the document 10, and upon receiving a copy command for the document 10 from the user, the document 10 After determining whether to allow copying of the document 10, whether or not to copy the document 10 may be controlled.

For convenience of explanation, in the present invention, an example in which the document copy management system 100 is provided in the copier 20 for copying the document 10 is described, but the document copy management system 100 of the present invention includes the copier 20 ), as well as a scanner for scanning the document 10, a multifunction printer in which the copier 20 and the scanner are implemented together, and is provided in various types of devices that perform copying, scanning, photographing, etc. Can be applied to control.

Further, in the present invention, an analog document such as a document 10 output from various digital devices and a document 10 written by hand is described as an example in which the document 10 to be copied is described, but a desktop computer (PC) , Notebook (Notebook), smart phone (Smart Phone), tablet computer (Tablet PC) can be applied equally to a digital document (Digital document) generated in various types of digital devices.

First, the document input unit 110 may receive a copy command for the document 10 from a user in a state in which the document 10 is input to the copier 20. For convenience of explanation, FIG. 1 shows an example in which the document input unit 110 is provided outside the copier 20, but a conventional command input unit provided in the copier 20 may be used as it is.

The pattern extraction unit 120 may extract the security color pattern 12 from the document 10 receiving the copy command. In the present invention, the security color pattern 12 is provided in the security document 10 for preventing copying, and may be configured with a plurality of colors.

2 is a diagram showing an example of a security document used in the document copy management system according to the first embodiment of the present invention, and FIG. 3 is a diagram showing an example of a security document used in the document copy management system according to the first embodiment of the present invention. It is a figure which shows an example of the formed 1st security color pattern.

As shown in FIG. 2, the security document 10 is divided into a first area 10a on which the document content 11 is printed and a second area 10b on which the security color pattern 12 is formed. Can be. 2 shows an example in which the second area 10b in which the security color pattern 12 is formed is formed on the top of the first area 10a on which the document content 11 is printed, but is not limited thereto, and the security color pattern The number, position, etc. of the second regions 10b in which (12) is formed can be changed as much as possible by a person skilled in the art.

As shown in FIG. 3, the security color pattern 12 may be composed of a plurality of colors provided in a plurality of divided areas. 3 shows an example in which the security color pattern 12 has a square shape as a whole _{and is composed of 9 colors C 1} (1) to C ₁ (9) provided in 9 partitioned areas, but the security color pattern ( The shape of 12), the arrangement shape, the number and arrangement of a plurality of colors, etc. can be changed at will by those skilled in the art. Further, although not shown, all of the plurality of colors may be configured differently or some may be configured with the same color.

Preferably, each of the plurality of colors may be set to have a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value in the CIE L*a*b* color space.

That is, as shown in FIG. 3, the first color C ₁ _{(1) of the nine colors C 1} (1) to C ₁ (9) has a brightness index L* value of L ₁ (1), a chromaticness index a * The value is set to a ₁ (1), the chromaticness index b* is set to b ₁ (1), and the remaining colors C ₁ (2) to C ₁ (9) may be set in a similar manner.

In general, L* values in the CIE L*a*b* color space have values from 0 to 100, and a* values and b values have approximately -120 to 120 values, respectively, in the CIE L*a*b* color space. The number of colors that can be theoretically expressed according to the combination of the L* value, a* value, and b* value of is approximately 256 million colors, so there is practically no limit to the colors that can be expressed in the security color pattern 12.

In addition, when a color value in the CIE L*a*b* color space is used for the security color pattern 12, different colors that cannot be distinguished by the naked eye for a plurality of colors constituting the security color pattern 12 It has the advantage of being able to specify. That is, when a color value in the CIE L*a*b* color space is used for the security color pattern 12, there is an advantage that it is difficult for others to arbitrarily duplicate the security color pattern 12.

Accordingly, in the security document 10 using the security color pattern 12 according to the first embodiment of the present invention, a plurality of colors constituting the security color pattern 12 are converted to brightness in the CIE L*a*b* color space. By setting to have an index L* value, a chromaticness index a* value, and a chromaticness index b* value, the security strength for the security document 10 may be further improved.

Referring back to FIG. 1, when the security color pattern 12 is extracted from the pattern extraction unit 120, the copy determination unit 130 determines whether to allow copying of the document 10 using the security color pattern 12. I can judge.

Preferably, the copy determination unit 130 constituting the document copy management system 100 according to the first embodiment of the present invention includes a security color pattern 12 extracted from the security document 10 (in FIG. 4 to be described later). , The first security color pattern 12) and the security color pattern 12 preset in the copier 20 (a second security color pattern 21 in FIG. 4 to be described later) are compared with each other to the document 10 It is possible to determine whether or not to allow copying. A detailed operation of the copy determination unit 130 will be described later in detail with reference to FIGS. 4 to 6.

Lastly, the copy control unit 140 may control the copying machine 20 to perform copying or not to copy the document 10 according to the determination result of the copy determination unit 130.

Meanwhile, in the document copy management system 100 according to the first embodiment of the present invention, a program, software or application (hereinafter, collectively referred to as'program') implemented to perform the series of processes is installed, These programs may be implemented to be independently executable or may be implemented to be executable through a web page.

As described above, the term'~ unit' used in the present embodiment refers to software or hardware components such as FPGA or ASIC, and the'~ unit' performs certain roles. However,'~ part' is not limited to software or hardware. The'~ unit' may be configured to be in an addressable storage medium, or may be configured to reproduce one or more processors. Thus, as an example,'~ unit' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, and procedures. , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, database, data structures, tables, arrays, and variables. Components and functions provided in the'~ units' may be combined into a smaller number of elements and'~ units', or may be further separated into additional elements and'~ units'. In addition, components and'~ units' may be implemented to play one or more CPUs in a device or a security multimedia card.

Hereinafter, a copy protection method using the security color pattern 12 using the document copy management system 100 according to the first embodiment of the present invention configured as described above will be described with reference to FIGS. 4 to 6 as follows. same.

First, as shown in FIG. 4, after receiving the secure document 10 through the copy machine 20, the document input unit 110 may receive a copy command for the document 10 from the user (S110 ). .

In addition, the pattern extraction unit 120 may extract the security color pattern 12 from the security document 10 receiving the copy command (S120). For convenience of explanation, hereinafter, the security color pattern 12 extracted from the security document 10 will be referred to as a first security color pattern 12.

On the other hand, when the pattern extraction unit 120 cannot extract the first security color pattern 12 from the security document 10 receiving the copy command, the copy determination unit 130 and the copy control unit 140 are set in advance. It is possible to control to perform copying on the document 10 according to the standard (No in step S130, left solid line), or control not to perform copying on the document 10 (No in step S130, right dotted line).

Meanwhile, the pattern extraction unit 120 may extract the first security color pattern 12 from the security document 10 (S120), and then extract the second security color pattern 21 preset in the copier 20. Yes (S140). Like the first security color pattern 12, the second security color pattern 21 is composed of a plurality of second colors, and each of the plurality of second colors is a brightness index L* in the CIE L*a*b* color space. It may be set to have a value, a chromaticness index a* value, and a chromaticness index b* value.

The copy determination unit 130 compares the first security color pattern 12 extracted from the security document 10 and the second security color pattern 21 set in advance in the copier 20 with respect to the document 10. It is possible to determine whether to allow copying (S150).

As shown in FIG. 5, the copy determination unit 130 includes a plurality of first colors C ₁ (1) to C ₁ (9) constituting the first security color pattern 12, and a second security color pattern ( 21) By sequentially comparing a plurality of second colors C ₂ (1) to C ₂ (9) constituting the document 10, it may be determined whether or not copying is permitted (S150).

Preferably, the copy determination unit 130 includes a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value _{for the plurality of first colors C 1} (1) to C _{1 (9).} When the plurality of second colors C ₂ (1) to C ₂ (9) are set equal to or within a predetermined range as the brightness index L* value, the chromaticness index a* value, and the chromaticness index b* value Only, it can be determined that copying of the document 10 is permitted.

First, the copy determination unit 130 has a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value _{for a plurality of first colors C 1} (1) to C _{1 (9),} If the brightness index L* value, chromaticness index a* value and chromaticness index b* value for a plurality of second colors C ₂ (1) to C _{2 (9) are equal, of course, for document 10} It can be determined that copying is allowed.

In contrast, the copy determination unit 130 has a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value _{for the plurality of first colors C 1} (1) to C _{1 (9).} , Although the brightness index L* value, chromaticness index a* value, and chromaticness index b* value for the plurality of second colors C ₂ (1) to C _{2 (9) are not the same, the plurality of first} The brightness index L* value, chromaticness index a* value, and chromaticness index b* value for colors C ₁ (1) to C ₁ _{(9) are a plurality of second colors C 2} (1) to C ₂ ( Even if it is within a predetermined error range from the brightness index L* value, chromaticness index a* value, and chromaticness index b* value for 9), it may be determined that copying of the document 10 is allowed.

In this case, the error range for determining that the copy determination unit 130 is allowed to copy the document 10 is the first time that has elapsed since the first security color pattern 12 was initially formed on the security document 10. _{A plurality of colors C 1} (1) to C ₁ (9) constituting the security color pattern 12 may be set in consideration of various conditions that may change.

Referring back to FIG. 4, when it is determined that copying is permitted for the document 10 as a result of the determination by the copy determination unit 130 (S150) (YES in step S160), the copy control unit 140 20) can be controlled to copy the document 10 (S170). On the contrary, when it is determined that copying is not permitted for the document 10 as a result of the determination by the copy determination unit 130 (S150) (No in step S160), the copy control unit 140 It is possible to control not to copy the document 10 (S180).

On the other hand, when it is determined that copying is not allowed for the document 10 as a result of the determination by the copy determination unit 130 (S150) (No in step S160), the copy control unit 140 controls the copy machine 20 (or , Printer) may be controlled to output content different from the document content 11 printed on the secure document 10 (S180).

Steps S110 to 170 shown in FIG. 6 are substantially the same as steps S110 to 170 shown in FIG. 4, and thus redundant descriptions will be omitted.

That is, as shown in FIGS. 5 and 6, the copy determination unit 130 includes a brightness index L* value and a chromaticness index a for a _{plurality of first colors C 1} (1) to C _{1 (9).} * Value and chromaticness index b* value, brightness index L* value, chromaticness index a* value, and chromaticness index b* value for a plurality of second colors C ₂ (1) to C _{2 (9)} When it is set to be out of a predetermined error range from, it is determined that copying is not allowed for the document 10 (No in step S160), and accordingly, the copy control unit 140 determines that the copy machine 20 is It is possible to control to output different content than (S190).

As described above, in the case of the security document 10 using the security color pattern 12 and the copy protection method using the security color pattern 12 according to the first embodiment of the present invention, a plurality of constituting the security color pattern 12 Each of the colors of CIE L*a*b* has a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value in the CIE L*a*b* color space, thereby being secured by the security color pattern 12 Copying of the document 10 can be easily prevented and the security level for the secure document 10 can be improved.

Hereinafter, a copy protection method using the security color pattern 12 according to the second embodiment of the present invention will be described with reference to FIGS. 7 to 11. For convenience of explanation, descriptions of the same structure and process as those of the first embodiment illustrated in FIGS. 1 to 6 will be omitted, and only differences will be described below.

The copy protection method using the security color pattern 12 according to the second embodiment of the present invention includes the first security information extracted from the security color pattern 12 of the security document 10 and the second security information preset in the copier 20. In that the security information is compared to determine whether to allow copying, whether or not copying is permitted by comparing the first security color pattern 12 of the security document 10 with the second security color pattern 21 set in advance in the copier 20 There is a difference from the first embodiment to determine the.

7, the document copy management system 200 according to the second embodiment of the present invention includes a document input unit 210, a pattern extraction unit 220, a security information generation unit 230, and a copy determination unit ( 240) and a copy control unit 250 may be included.

That is, the document copy management system 200 according to the second embodiment of the present invention shown in FIG. 7 is different from the document copy management system 200 according to the first embodiment of the present invention shown in FIG. A security information generator 230 for generating security information included in the security color pattern 12 of the security document 10 may be further included.

In other words, the security information generation unit 230 extracts the security color pattern 12 from the security document 10 by the pattern extraction unit 220, and then the security document from each of a plurality of colors constituting the security color pattern 12. (10) You can extract security information about whether or not to be secure.

Hereinafter, referring to FIGS. 8 to 11, a method for preventing copying using the security color pattern 12 using the document copy management system 200 according to the second embodiment of the present invention configured as described above will be described as follows. same.

First, as shown in FIG. 8, after the document input unit 210 receives a copy command for the document 10 from the user (S210), the pattern extraction unit 220 receives the copy command. ) Can be extracted from the security color pattern 12 (S220).

As described above, the security color pattern 12 is composed of a plurality of colors, and each of the plurality of colors is a brightness index L* value, a chromaticness index a* value, and a chromaticity index in the CIE L*a*b* color space. It can be set to have a tickness index b* value.

After the pattern extraction unit 220 extracts the security color pattern 12 from the security document 10 (S220), the security information generation unit 230 configures the security color pattern 12 extracted from the security document 10 The first security information may be extracted from each of a plurality of colors to be generated.

Preferably, the pattern extraction unit 220 combines a plurality of preset unit characters for a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value for each of a plurality of colors to be removed. 1 You can create security information.

In this case, the pattern extraction unit 220 may use a color mapping table (T) to extract a plurality of unit characters preset for each of the plurality of colors. This color mapping table T is a kind of look-up table (LUT) set in advance by a user.

9 is a diagram illustrating various examples in which a copy determination unit constituting a document copy management system according to a second embodiment of the present invention generates first security information from a security color pattern, and FIG. 10 is a second embodiment of the present invention. A diagram illustrating an example of a color mapping table used when the copy determination unit constituting the document copy management system according to FIG. 2 generates first security information from a security color pattern.

For convenience of explanation, in FIGS. 9A to 9C, a case in which “bok” is included in the first security information will be described as an example.

In (a) and (b) of FIG. 9, a unit character preset in the first color C ₁ (1) of _{the plurality of colors C 1} (1) to C _{1 (9) constituting the security color pattern 12 is combined.} An example of creating a'clothing' is shown, and in (c) of FIG. 9, the first color C ₁ (1) _{among a plurality of colors C 1} (1) to C _{1 (9) constituting the security color pattern 12} To the third color C ₁ (3) shows an example of generating a'bok' by combining three unit characters set in advance.

First, the unit characters preset for a specific color are the preset Hangul syllables, alphabets (uppercase, lowercase), numbers and special values for the brightness index L* value, chromaticness index a* value, and chromaticness index b* value. It can be any one of symbols.

That is, (a) the first color C ₁ of the plurality of color C ₁ 1 to C ₁ (9) In (1) of Fig. 9 is a psychometric lightness L * value of L ₁ (1), chromatic ness index a * A value is set to a ₁ (1), a chromaticness index b* value is set to b ₁ (1), and'bok', one of the syllables of Hangul, is preset in the first color C _{1 (1).} .

Meanwhile, in FIG. 10, a color mapping preset for a specific color in which unit characters, which are Korean syllables, alphabets, numbers, and special symbols, have a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value. An example of the table T is shown. In this case, the unit character may include various types of foreign language characters such as Korean, English (alphabet), as well as Japanese and Chinese, depending on the environment to which the present invention is applied.

This color mapping table T may be stored in advance inside the document copy management system 200 or may be stored in a separate remote database server (not shown) connected to the document copy management system 200 by wire or wirelessly. .

Meanwhile, FIG. 10 shows an example in which a specific unit character constituting the color mapping table T is preset for a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value for a specific color. However, it is not limited thereto, and a specific unit character is a certain range of a brightness index L* value, a certain range of a chromaticness index a* value, and a certain range of a chromaticness index b* value in the CIE L*a*b* color space. A certain range may be set in advance.

For example, in FIG. 10, the unit character'each' expressed as a syllable is a color value C11 corresponding to a brightness index L* value L11, a chromaticness index a* value a11, and a chromaticness index b* value b11. A set example is shown, but if necessary, the unit character'each' is an index L* value range L11 to L11', a chromaticness index a* value a11 to a11', and a chromaticness index b* value b11 to b11 It may be set to a certain range of color values C11 to C11 corresponding to'.

In this way, a specific unit character is pre-existed for a certain range of brightness index L* values, a certain range of chromaticness index a* values, and a certain range of chromaticness index b* values in the CIE L*a*b* color space. _{When set, a plurality of colors C 1} (1) to C ₁ (9) constituting the security color pattern 12, such as the time elapsed since the security color pattern 12 was initially formed on the security document 10, are Even if it changes, it is possible to solve the problem of extracting the first security information different from the original from the security color pattern 12, and it is possible to extract and generate the desired first security information within a predetermined error range.

Meanwhile, referring to FIG. 9 again, as another example of a unit character preset for a specific color, a unit character that is a syllable of Hangul among a plurality of unit characters is a brightness index L* value, chroma for each of the initial, neutral, and ending of the syllable. The tickness index a* value and the chromaticness index b* value may be set, respectively.

That is, (b) the first color C _{1 (1)} of the plurality of color C _{1 (1)} to C ₁ (9) of Fig. 9 is a psychometric lightness L * value of L _{1 (1),} chromatic ness index a * The value is set to a ₁ (1), the chromaticness index b* value is set to b ₁ (1), and the brightness index L* value constituting the _{first color C 1} _{(1) is L 1} (1), chromaticness The exponent a* value is a ₁ (1) and the chromaticness index b* value is b ₁ (1). An example is shown.

As another example, the unit character preset for a specific color is a phoneme, alphabet, and alphabet of Hangul preset for a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value for each of a plurality of colors. It may be either a number or a special symbol.

That is, in (c) of FIG. 9, the brightness index L* value, chromaticness index a* value, and chromaticness index b* value for a specific color constituting the security color pattern 12 correspond to one phoneme. , Among the plurality of colors C ₁ (1) to C ₁ (9), the first color C ₁ (1) corresponds to the Korean phoneme'ㅂ' (first voice), and the second color C ₁ (2) is the Korean phoneme'ㅗ. It shows an example in which the third color C ₁ (3) corresponds to'(neutral)' and the phoneme'a' of the Hangul (lasting voice). Accordingly, in (c) of FIG. 9, three colors, that is, C ₁ (1) to C ₁ (3) may be combined to form one syllable'bok'.

Referring to FIG. 8 again, the copy determination unit 240 compares the first security information extracted from the security color pattern 12 of the security document 10 and the second security information preset in the copier 20 with each other. It may be determined whether to allow copying of the document 10 (S250).

As shown in FIG. 11, the copy determination unit 240 includes a first color _{extracted from a plurality of first colors C 1} (1) to C ₁ (9) constituting the security color pattern 12 of the security document 10. By comparing the 1 security information with the second security information preset in the copier 20, it may be determined that copying of the document 10 is allowed only when the first security information and the second security information are the same (S250). ).

Referring to FIG. 8 again, as a result of the determination by the copy determination unit 240 (S250), when it is determined that copying is allowed for the document 10 (YES in step S260), the copy control unit 250 20) can be controlled to copy the document 10 (S270). On the contrary, when it is determined that copying is not permitted for the document 10 as a result of the determination in the copy determination unit 130 (S250) (No in step S260), the copy control unit 250 It is possible to control not to copy the document 10 (S280).

On the other hand, although not shown, when it is determined that copying is not allowed for the document 10 as a result of the determination by the copy determination unit 240 (S250) (No in step S260), the copy control unit 250 It is also possible to control the copier 20 (or printer) to output content different from the document content 11 printed on the secure document 10.

As described above, in the case of the security document 10 using the security color pattern 12 and the copy protection method using the security color pattern 12 according to the first embodiment of the present invention, in the CIE L*a*b* color space Security information is generated by combining a plurality of unit characters set for each of a plurality of colors having a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value of ), copying of the secure document 10 can be easily prevented, and the security level for the secure document 10 can be further improved.

Meanwhile, the present specification and drawings disclose preferred embodiments of the present invention, and although specific terms are used, these are merely used in a general meaning to easily explain the technical content of the present invention and to aid understanding of the present invention. It is not intended to limit the scope of the invention. In addition to the embodiments disclosed herein, it is apparent to those of ordinary skill in the art that other modifications based on the technical idea of the present invention may be implemented.

The present invention relates to a security document using a security color pattern and a copy protection method using a security color pattern, and more particularly, to a security document that can easily prevent copying of a security document and improve the security level of the security document. It can be applied to technical fields related to security documents using color patterns and copy protection methods using security color patterns.

Claims

A first area of the printing surface on which the document content is printed; And

Includes at least one second area in which a first security color pattern composed of a plurality of first colors is formed among the printing surfaces,

The above document contents are:

According to a result of sequentially comparing each of the plurality of first colors and each of the plurality of second colors constituting a second security setting pattern preset in the copier, copied by the copier,

Each of the plurality of first colors and each of the plurality of second colors,

It is set to have a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value in the CIE L*a*b* color space,

The above document is

The brightness index L* value, chromaticness index a* value, and chromaticness index b* value for each of the plurality of first colors are the brightness index L* value, chromaticness for each of the plurality of second colors A security document using a security color pattern, characterized in that the document is copied by the copier only when the value of the index a* and the value of the chromaticness index b* are the same or are set within a predetermined range.
The method of claim 1,

The brightness index L* value, chromaticness index a* value, and chromaticness index b* value for each of the plurality of first colors are the brightness index L* value, chromaticness for each of the plurality of second colors The security document using a security color pattern, characterized in that when set to deviate from a predetermined range from the value of the index a* and the value of the chromaticness index b*, the copier outputs contents different from the contents of the document.
A first area of the printing surface on which the document content is printed;

The printing surface includes at least one second area composed of a plurality of colors and in which a security color pattern including first security information regarding whether or not the document content is secured, is formed,

Each of the plurality of colors,

It is set to have a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value in the CIE L*a*b* color space,

The first security information,

It is set by combining a plurality of preset unit characters for the brightness index L* value, the chromaticness index a* value, and the chromaticness index b* value for each of the plurality of colors,

The above document contents are

A security document using a security color pattern, characterized in that the first security information is copied by the photocopier only when the first security information is the same as the second security information preset by the photocopier.
The method of claim 3,

When the first security information is not the same as the second security information, the copier outputs a content different from the document content.
The method of claim 3,

Each of the plurality of unit characters,

Characterized in that any one of syllables, alphabets, numbers, and special symbols of Hangul set in advance for the brightness index L* value, chromaticness index a* value, and chromaticness index b* value for each of the plurality of colors. Secure document using secure color pattern.
The method of claim 5,

In the case of a unit character that is a syllable of Hangul among the plurality of unit characters,

A security document using a security color pattern, characterized in that a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value are respectively set for the initial, neutral, and final voices of syllables.
The method of claim 3,

Each of the plurality of unit characters,

Characterized in that any one of phonemes, alphabets, numbers, and special symbols of Hangul preset for the brightness index L* value, chromaticness index a* value, and chromaticness index b* value for each of the plurality of colors. Secure document using secure color pattern.
Receiving a copy command for the document;

Extracting a first security color pattern composed of a plurality of first colors from the document;

Determining whether to allow copying of the document by sequentially comparing each of the plurality of first colors with each of the plurality of second colors constituting a second security setting pattern preset in a copier; And

When it is determined that copying is permitted for the document as a result of the determination, controlling the copier to copy the document,

Each of the plurality of first colors and each of the plurality of second colors,

It is set to have a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value in the CIE L*a*b* color space,

The step of determining whether to allow copying of the document,

The brightness index L* value, chromaticness index a* value, and chromaticness index b* value for each of the plurality of first colors are the brightness index L* value, chromaticness for each of the plurality of second colors A copy protection method using a security color pattern, characterized in that it is determined that copying is allowed for the document if it is set within a predetermined range or equal to the value of the index a* and the value of the chromaticness index b*.
The method of claim 8,

When it is determined that copying is not permitted for the document as a result of the determination, the copier outputs a content different from the content of the document.
Receiving a copy command for the document;

Extracting a security color pattern composed of a plurality of colors from the document and including first security information regarding whether or not the document is secured;

Determining whether the first security information is the same as second security information preset in a copier; And

As a result of the determination, when the first security information is the same as the second security information, controlling the copier to copy the document,

Each of the plurality of colors,

It is set to have a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value in the CIE L*a*b* color space,

The first security information,

Using a security color pattern, characterized in that it is set by combining a plurality of preset unit characters for the brightness index L* value, the chromaticness index a* value, and the chromaticness index b* value for each of the plurality of colors. How to prevent copying.
The method of claim 10,

When the first security information is not the same as the second security information, the copying machine outputs a content different from the document content.
The method of claim 10,

Each of the plurality of unit characters,

Characterized in that any one of syllables, alphabets, numbers, and special symbols of Hangul set in advance for the brightness index L* value, chromaticness index a* value, and chromaticness index b* value for each of the plurality of colors. Copy protection method using secure color pattern.
The method of claim 12,

In the case of a unit character that is a syllable of Hangul among the plurality of unit characters,

A copy protection method using a security color pattern, characterized in that a brightness index L* value, a chromaticness index a* value, and a chromaticness index b* value are respectively set to the initial, neutral, and final voices of syllables.
The method of claim 10,

Each of the plurality of unit characters,

Characterized in that any one of phonemes, alphabets, numbers, and special symbols of Hangul preset for the brightness index L* value, chromaticness index a* value, and chromaticness index b* value for each of the plurality of colors. Copy protection method using secure color pattern.