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Matrix circulant screening method used for graphic-text information hiding and anti-counterfeiting

A technology of information hiding and matrix, which is applied in printing, image data processing, image data processing, etc. in the production of special varieties of printed matter. It can solve the problems of easy imitation, low anti-counterfeiting coefficient, breakpoints, etc. Effects that hide effects and increase the degree of difficulty

Active Publication Date: 2015-10-21
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

At present, in this method, because the dots of the traditional shape are evenly distributed dot matrix information, breakpoints will appear after the position of the dots is shifted, and white or black lines that can be perceived by the human eye will be formed macroscopically, which will affect the printing quality and graphics. The effect of hiding information, at the same time, the types of dots in traditional shapes are limited, counterfeiters are easy to imitate, and the anti-counterfeiting coefficient is not high

Method used

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  • Matrix circulant screening method used for graphic-text information hiding and anti-counterfeiting

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Embodiment Construction

[0035] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] The present invention is a kind of matrix rotation screening method that is used for graphic information hiding anti-counterfeiting, specifically implements according to the following steps:

[0037] Step 1, design aggregated state screening threshold matrix:

[0038] Let the order of the grid be n×n, and the angle of the grid lines be θ, so that m, n, p, and q are all integers, and p, q are mutually prime numbers. Assuming that the size of the screening threshold matrix is ​​L×K, then the maximum value of the threshold is Q max =L×K, L=m(p 2 +q 2 ), K=m. Select a certain grid in the threshold matrix as the center point, and design the aggregation state screening threshold matrix from the inside out according to the shape requirements of the dots, that is, the value in the grid is from the center point to the outside according to...

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Abstract

The invention discloses a matrix circulant screening method used for graphic-text information hiding and anti-counterfeiting. The matrix circulant screening method comprises the following specific steps: step 1, designing an aggregation-state screening threshold value matrix; step 2, establishing a matrix circulant screening algorithm; step 3, generating a half-tone image; step 4, embedding to-be-hidden graphic-text information; step 5, manufacturing an explicit-implicit tool; and step 6, inspecting hidden graphic-text information. According to the matrix circulant screening method used for graphic-text information hiding and anti-counterfeiting disclosed by the invention, a connecting screen dot with a special shape is generated by utilizing circulant screening of a plurality of threshold matrixes for being applied to a graphic-text information hiding and anti-counterfeiting technology, so that a breakpoint problem which appears during conventional dot matrix screen dot hiding in a current method is solved, hiding effect of the graphic-text information is optimized, and a counterfeiting difficulty coefficient is also increased by introducing the screen dot with the special shape.

Description

technical field [0001] The invention belongs to the technical field of printing halftone screen screening, and relates to a matrix rotation screen screening method, in particular to a matrix rotation screen screening method for graphic information hiding and anti-counterfeiting. Background technique [0002] With the rapid development of printing technology, counterfeiting and chaotic phenomena have emerged, and anti-counterfeiting printing technology has become an indispensable technical means in the printing industry. The anti-counterfeiting method based on halftone screening technology to hide graphic and text information is simple and easy, does not change the traditional printing production equipment and process, and does not increase production costs. It is an anti-counterfeiting method that has developed rapidly in recent years. The hiding of the image is achieved by offsetting the dot position, and the hidden information can be revealed after adding the corresponding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41C1/00B41M3/14G06T1/00
Inventor 郭凌华邢铁豆陈燕刘国栋
Owner SHAANXI UNIV OF SCI & TECH
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