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Generation method and device of anti-copying shading

An anti-copying and shading technology, applied in the direction of digital output to printing units, etc., can solve the problems of high dependence on printer equipment, poor information hiding effect in warning areas, poor performance adaptability of copier hardware equipment, etc., to achieve ideal hiding effect and compatibility. The effect of good performance and wide applicability

Active Publication Date: 2018-01-16
亓文法
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Problems solved by technology

[0008] The present invention provides an improved method and device for generating anti-copy shading, which is used to solve the problems in the prior art that the output of anti-copy shading is highly dependent on printer equipment, the information hiding effect of the warning area is poor, and the hardware performance of the copier is limited. Shortcomings such as poor adaptability, and further uniformly solve technical problems such as security control during the printing and copying of paper documents

Method used

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  • Generation method and device of anti-copying shading

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Embodiment Construction

[0047] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0048] Such as figure 1 As shown, a method for generating anti-copy shading in this embodiment includes the following steps:

[0049] S101 firstly generates a rectangular area according to the page size of the document, and digitally screens by AM method to obtain a background reserved area Φ.

[0050] In the background reserved area Φ, the gray value of the digital screen is consistent, the gray value interval is 5%-15%, the screen mesh number interval is 60 lines to 150 lines, and the dot types are circular, square, Oval or linear.

[0051] figure 2 Schematic diagram of the effect of preserving the area for the background. The picture (a) is a schematic diagram of the document page size, and the picture (b) is a halftone image processed by AM method, and the whole area is added with a flat screen, that is, the gray value is exactly the same.

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Abstract

The invention relates to a generation method and device of anti-copying shading. The method comprises the following steps: 1) generating a rectangular region based on the page size of a document, andperforming digital screening in an amplitude modulated (AM) screening way to obtain a background reserved region; 2) generating a plurality of warning information pattern sub-regions to be hidden, performing digital screening in a frequency modulated (FM) screening way to obtain halftone image region blocks, and the combining all the halftone image region blocks into a warning information region;3) superimposing the background reserved region and the warning information region to fuse the warning information region into the background reserved region; and 4) improving the hiding effect of thewarning information region to obtain anti-copying shading lattice image data. Through adoption of the generation method and device, the problems of high dependence of anti-copying shading output on printer equipment, poor information hiding effect of a warning region and poor adaptability to the performance of copier hardware equipment in the prior art can be solved.

Description

technical field [0001] The invention belongs to the field of paper document protection, and relates to a method and device for generating anti-copy shading of paper documents, in particular to a general method and device for generating anti-copy shading based on dot matrix image data synthesis. Background technique [0002] Paper is an important carrier of information dissemination, and the confidentiality function of printed documents is also particularly important. For example, improper copying of confidential documents and certificates has become a problem, which has promoted the development of printing anti-counterfeiting technology to a certain extent. The common anti-copy methods of documents mainly include: based on special printing materials (special paper and ink, etc.), printing equipment and printing processes (gravure printing, hand-engraved plate embossing, engraved plate, rainbow printing, computer-created plate printing, etc.) ) and other technologies, but the...

Claims

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Application Information

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IPC IPC(8): G06F3/12
Inventor 李晓妮
Owner 亓文法
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