WO2006133615A1

WO2006133615A1 - A printing method for the safe document with built-in copying-prevention shading

Info

Publication number: WO2006133615A1
Application number: PCT/CN2006/000853
Authority: WO
Inventors: Wenfa Qi; Yali Lei; Lidong Wang; Bin Yang
Original assignee: Beijing Founder Electronics Co., Ltd.; Peking University
Priority date: 2005-06-13
Filing date: 2006-04-29
Publication date: 2006-12-21
Also published as: CN1709709A; CN100391745C

Abstract

The invention relates to a printing method for the safe document with built-in copying-prevention shading. The prior art needs to use the expensive special paper of the prevented copying shading printing and the freedom of design of the copying-prevention safe shading is low. The invention integrates the module of the copying-prevention safe shading into the printer's drive. The module transfers parameters to the printer drive by the joint function. Then the printer driving program transfers the corresponding function module to create the digital watermark data which contains the copying-prevention safe shading and saves the data to the page descriptive document. It amalgamates the data of the normal printing document and the digital watermark document to create a new document and print. Adopting the invention can implement the coinstantaneous print of the copying-prevention safe shading and the normal document data. The method is applicable for normal paper and improves freedom of design in copying-prevention safe shading.

Description

Printing method of security document with embedded anti-copy shading

Technical field

The invention belongs to the technical field of document printing, and relates to a method for printing a document against copying, in particular to a method for distinguishing an original document and a copy by simultaneously printing an anti-copying pattern embedded in a security graphic at the bottom of the original document. . Background technique

Paper is an important carrier of information dissemination. The confidentiality of printed documents is also particularly important. For example, improper copying of confidential documents and certificates becomes a problem, which promotes the development of printing anti-counterfeiting technology to a certain extent. The anti-counterfeiting technology of printing technology requires precise printing equipment and inks and papers matched with it. If you can monopolize a set of high-quality, sophisticated computer-based printing equipment and raw materials, or a process that others do not have, or do not have enough financial resources to copy, anti-counterfeiting technology can fully play its role. Common printing anti-counterfeiting technologies include gravure printing, hand-engraved embossing, engraving, rainbow printing, computer-printed printing, and so on. However, there are two problems in printing anti-counterfeiting technology. The cost of printing is relatively high, and the anti-counterfeiting effect depends on factors such as the quality of printing, the difficulty of plate making and printing, and the size of investment in disposable equipment. The more ideal the anti-counterfeiting effect, the higher the corresponding production cost, so only enterprises with strong capital and technical strength will adopt it; the second is not easy to identify and judge the authenticity of the document. The anti-counterfeiting technology with high printing difficulty is mainly based on the fact that people use the naked eye to identify when necessary. It is difficult for those who do not have professional printing knowledge to accurately distinguish the authenticity. The anti-counterfeiting technology described above prevents counterfeiters from copying the same document to a certain extent, but faces the challenge of growing copying or scanning devices.

Among the office automation aids, special attention and attention is paid to the copier, which is the most indispensable auxiliary equipment in office automation equipment. Modern copiers have reached a high level both in function and in print quality. Some have intelligent editing capabilities, and multiple copiers can be connected to each other to transmit information. Some of the more advanced copiers can even achieve color copying, and the printed banknotes can be spurious. This ability of the copier makes it possible to print various documents efficiently and with high quality, greatly reducing the amount of copying labor for office workers, improving office efficiency, and being greatly welcomed by office personnel. At the same time, however, it also faces new problems in confidentiality prevention. The confidential documents are easily copied and lost control, and the copier becomes a convenient tool for venting and stealing. This problem can be seen from the fact that in recent years, the vast majority of confidential documents intercepted by customs have been copied. To solve this problem, in addition to strengthening the management and control of copying confidential documents, it is also necessary to study the anti-copy technology using classified documents.

The use of special anti-copy paper can achieve the purpose of anti-copying of documents. The surface of the paper is coated with a special material. When copying or scanning special marks, the logo can only be made into black and white. The VOID type is displayed to make the copying fail. Due to the high cost of copy-protected paper, the anti-counterfeit mark made by this method is generally used for packaging of products such as computer software and cosmetics, and the printed document uses ordinary paper. Later, there was a special paper for copy-proof shading printing, which was printed with a layer of anti-copying shading before the normal document data. The shading was pre-embedded with illegible "copy prohibited", "C0PY,,,"VOID". When the document is improperly copied, the text is clearly displayed, and it can be clearly judged as a copy. However, this copy-proof printing paper is not only expensive, but also the degree of freedom in the design of the shading. With the advent of the digital printing era, more and more important documents such as securities, certificates and bills are output on the printer. The demand for printing paper is greatly increased, and the requirements for confidentiality and anti-counterfeiting functions are also More and more high, so the existing anti-copying and printing special paper is difficult to meet the current needs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a printing method in which a security document having an anti-copy texture is embedded, in view of the deficiencies of the prior art. The method can print a security document with copy-proof shading by ordinary printing paper and printing equipment, thereby greatly reducing the cost of printing such documents, and the method can freely design anti-copy shading, which is very Good flexibility. In order to achieve the above objectives, the technical solution adopted by the present invention is:

A method for printing a security document with an anti-copy shading, comprising the following steps:

(1) First, a graphic user interface GUI (Graphical User Interface) having a function module for generating anti-copy shading is integrated in the printer driver, and then a core module for generating a copy-proof shading function is called in the printer driver, and according to the set technology The parameter generates digital watermark data, and saves the watermark data in a corresponding page description file, where the digital watermark data includes three parts: a background pattern area, a mark text area and an interference pattern;

(2) When printing a document, the printer driver combines the intercepted data file of the normal document with the digital watermark data file to generate a final page description file;

(3) The merged data file is directly printed and output after being processed by the printer. Further, in step (1), when the core module that generates the anti-copy shading function is generated in the printer driver to generate the digital watermark data, the user sets the shading color and density in the GUI of the anti-copy shading function module, and selects the interference pattern. .

In the step (1), when the core module for generating the anti-copy shading function is generated in the printer driver to generate digital watermark data, the user sets the content of the markup text, the font attribute, the setting, the angle, and the GUI in the GUI of the copy-proof shading function module. Whether the markup text is repeatedly tiled on the layout.

In step (1), the number of core modules generated to generate the anti-copy shading function is called in the printer driver. When the word watermark data is used, the print date and printer IP address information are embedded in the copy proof.

In step (1), digital watermark data generated by the core module of the copy-proof shading function is stored in the extended page description language PS2, PS3, PCL5 or PCL6.

In step (1), when the core module that generates the anti-copy shading function is called in the printer driver to generate digital watermark data, the gray value information of the background area is retained in the GUI of the copy-proof shading function module, and the mark is retained. The gray value information of the word area is lost; or the gray value information of the background area is lost, and the gray value information of the mark word area is retained. Further, when the normal data file and the digital watermark file are combined in the step (2), the digital watermark data containing the anti-copy shading is under the normal document data. Further, the page description file processor in the printer supports interpretation of page description files with different number of nets. The effect of the invention is that: by using the method of the invention, the security document with the anti-copy security shading is printed on the plain paper, and the arrangement of the anti-copy shading characters can be freely set by the invention. The hidden font can be changed arbitrarily, and the printing method is simple and convenient, so that the problems faced by the anti-copying technology in the printing field are well solved.

With the technical solution of the present invention, an anti-copying shading is additionally printed on the underside of the confidential document data, the grayscale of the shading is shallow, and the visual effect of the normal document is not hindered; the document with the anti-copy shading is printed. For protected confidential documents, when the document is scanned on a copier or scanner, parts of the anti-copy shading cannot be completely sampled, and the previously embedded mark text will appear, making it easy to identify the copy of the document. And originals.

In the method of the invention, the gray values in the background area and the marked text area are relatively close, so that the hidden effect of the mark word is ideal, and the hidden information is not found by inadvertently viewing.

The document printing method of the present invention has great flexibility, because the printing method is relatively convenient, and the document can be condensed: and the security shading is printed at the same time.

The method of the present invention is applicable to any MFP (Mul t ifunct ional Printer) and ordinary printer equipment, and different movements have different requirements for gray values.

The document printing method for embedding anti-copying shading proposed by the invention can be applied to plain paper, and the management is convenient. DRAWINGS

Figure 1 Schematic diagram of the marked text area in the copy proof

Figure 2 Schematic diagram of the background pattern in the anti-copy shading Figure 3 Schematic diagram of the interference pattern in the anti-copy shading

Figure 4 is a partial enlarged view of the copy-proof shading

Figure 5 Schematic diagram of direct printout of copy-proof shading

Figure 6 Schematic diagram of normal document data

Figure 7 Figure 5 Schematic diagram of the results after copying on the copier

Figure 8 Schematic diagram of simultaneous printout of normal data and anti-copy shading

Figure 9 Figure 8 Schematic diagram of the results after copying on the copier

Figure 10 Schematic diagram of the flow of the present invention

The invention is further described below in conjunction with the drawings and specific embodiments.

Firstly, the DWM GUI (Digital Watermark GUI) with the function of generating the digital watermark anti-copying function is called in the printer driver GUI through the corresponding command button, and is set in the GUI of the anti-copy shading function module through the user interface. The following technical parameters:

(1) Selecting the type of interference pattern, this embodiment selects a set of curves arranged by sinusoidal lines;

(2) Enter the tag text "Prohibit copying";

(3) Select the font name of the tag word as "Chinese language,,;

(4) Set the font size of the tag word to n pt;

(5) Specify the position of the tag word, which can be up, center, down, left or right;

(6) Set the angle of the marker word to 45 degrees counterclockwise;

(7) Choose whether to repeat the entire layout;

(8) When the grayscale information of the background area is lost when the document is copied or the gray value information of the mark word area is lost, the latter is selected in this embodiment;

(9) Set the gradation level of the copy-protected shading to 3. After the user sets all the technical parameters, the print driver calls the digital watermark core module Digital Watermark Core, which generates the anti-copy shading. The printer driver transmits the above technical parameters to the Digital Watermark Core module through the corresponding interface function, Digi tal Watermark Core module. It is responsible for generating digital watermark data containing anti-copy shading, and saving the data on the hard disk in the page description file format, ie, PS format. The beginning of the PS file contains a line of descriptive strings. After the string, another identifier character is inserted, such as "OxOA". The normal digital watermark data is appended to "OxOA", and the absolute path name of the digital watermark data file is also added. Return to the printer driver.

The overall effect of the anti-copy shading generated by the Digi tal Watermark Core module is shown in Figure 5. Figure 4 is a partially enlarged schematic view of Figure 5. The mark pattern of the anti-copy shading is shown in Figure 1. The schematic diagram shows that the marker pattern is composed of small dots of 45 degree angle; the background pattern of the anti-copy shading is shown in Figure 2, and the background pattern is composed of large dots of 45 degree angle; Figure 3 is anti-copying Interference patterns in the shading, there are many patterns of interference patterns, which are used to interfere with human vision. The marker word is embedded in a large area of the background area, and the interference pattern can attract the attention of the human eye, so that the marker word is hidden better. In addition, the gray value of the background area and the mark word area are exactly the same, so it is difficult for the human eye to find the warning mark word with the word "copy prohibited" in FIG. 5 without careful observation. However, the dot area in the background area and the mark word area are different, and the copying machine has different ability to sample the two areas. When the document is copied on the copier, most of the gray value information in the marked word area is lost, thereby presenting a blank area; most of the gray value information of the background area is retained, and the warning image of "copy prohibited" appears. 5 The effect of copying on the copier is shown in Figure 7, so that the copy and original can be easily identified. If the constituent dots of the background pattern are smaller than the dots in the mark word pattern, the effect after copying is reversed, that is, most of the gray value information of the background region is lost, and most of the gray value information in the mark word region is retained.

After the printer driver receives the path name of the digital watermark file returned by Digi tal Watermark Core, it enters the process of combining the normal document data file with the digital watermark file:

(1) The printer intercepts the PS file transmitted by the front-end editing software, as shown in Figure 6;

(2) Open the corresponding PS file according to the path name of the digital watermark file, search for the identifier "Ox OA", and then read all the data after it;

(3) The printer driver combines the PS file data of the normal document with the data of the digital watermark PS file to generate a new PS file, wherein the data of the digital watermark file is appended to the end of the normal document data.

The printer driver passes the merged PS file to the Rip (Ras ter Image processor), which prints the built-in raster image processor, where Rip has the ability to process PS files that support different numbers of linked nets. The Rip processed rasterized data is sent to the final printout device.

The effect after printing out by the present invention is as shown in Fig. 8. Similarly, if it is difficult to discern the hidden mark word information in the copy proof, the effect after copying is as shown in Fig. 9, and it is obvious that the figure 8 can be distinguished. To print the original of the document, Figure 9 is a copy.

By the present invention, simultaneous printing of normal document data and digital watermark data can be conveniently realized, the printing speed is relatively fast, and various attributes of the tag word can be flexibly modified during the printing process. The method is suitable for printing plain paper, and the cost is relatively low, so that the user's demand is well satisfied.

Figure 10 is a schematic overall flow diagram of the present invention. The above steps are only a preferred embodiment. Other implementations will be readily apparent to those skilled in the art without departing from the general inventive concept. The interference pattern in the anti-copy shading can be designed in any pattern.

The mark words in the anti-copy shading can be replaced by other security graphics, company logo images, and personal signatures.

The core module that generates the anti-copy shading function generates digital watermark data that can be saved into other page description languages (PDL), such as PCL5 or PCL6.

The normal data and the digital watermark data may have different combinations, for example, the digital watermark data is stored in the memory of the computer in the form of a page description language data stream, and then merged with the normal document data stream described by the page description language, and simultaneously Printout.

The anti-copying shading can be divided into different areas, and different markings and gray value information are set in each area, so that different effects can be obtained, and at the same time, due to the difference of the gray value information, the copying can be well adapted to different copying. Ink setting. When the copier's ink level is set too large or too small, the effect in some areas may be invalid, but the effect may be ideal in other areas.

Claims

Claim

1. A method of printing a security document with an anti-copy shading, comprising the following steps:

(1) First, a graphical user interface GUI having a function module for generating anti-copy shading is integrated in the printer driver, and then a core module for generating an anti-copy shading function is called in the printer driver, and digital watermark data is generated according to the set technical parameters. And storing the watermark data in a corresponding page description file, where the digital watermark data includes three parts: a background pattern area, a mark text area, and an interference pattern;

(3) The merged data file is directly printed and output after being processed by the printer.

2 . The printing method of a security document with a copy-proof shading according to claim 1 , wherein: in step (1 ), a core module for generating an anti-copy shading function is generated in a printer driver to generate a digital watermark. In the case of data, the user sets the shading color and density in the graphic user interface of the copy proof shading function module, and selects the interference pattern.

3. The method according to claim 1, wherein the step (1) in the printer driver calls a core module that generates an anti-copy shading function to generate a digital watermark. In the case of data, the content, font attributes, position, angle, and markup text of the markup text are repeatedly tiled on the layout by the user in the GUI of the copy-proof shading function module.

4. The printing method of a security document with a copy-proof shading according to claim 2, wherein: in step (1), a core module for generating an anti-copy shading function is generated in a printer driver to generate a digital watermark. In the case of data, the print date and printer IP address information are embedded in the copy proof.

5. The method according to claim 1, wherein: in step (1), the digital watermark data generated by the core module of the copy-proof shading function is saved and expanded. The page description file is in PS2, PS3, PCL5 or PCL6.

6. The method according to claim 1, wherein: in step (2), when the normal data file and the digital watermark file are combined, the number containing the copy-preventing shading is included. The watermark data is below the normal document data.

7. The method according to claim 1, wherein: in step (1), a core module that generates an anti-copy shading function is generated in the printer driver to generate a digital watermark. In the data, in the GUI of the anti-copy shading function module, the gray value information of the background area is retained during document copying, and the gray value information of the mark word area is lost; or the gray value information of the background area is lost. The gray value information of the mark word area is reserved.

8: A method of printing a security document with a copy-proof proof embedded according to claim 1, Its features are: The page description file processor in the printer supports interpretation of page description files with different number of nets. '