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A Matching Method of Analog Raster Based on Hidden Image Dot Area Ratio

A technology of dot area ratio and simulation matching, which is applied in image analysis, image data processing, instruments, etc., can solve the problems of tediousness and large amount of calculation, and achieve the effect of simple calculation method, convenient operation, and good display effect

Active Publication Date: 2017-04-19
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a matching method of analog grating based on the dot area ratio of the hidden image, which solves the problem that the amount of calculation is relatively large and cumbersome when using an orthogonal experiment to match the dot area ratio and the grating parameters

Method used

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  • A Matching Method of Analog Raster Based on Hidden Image Dot Area Ratio
  • A Matching Method of Analog Raster Based on Hidden Image Dot Area Ratio
  • A Matching Method of Analog Raster Based on Hidden Image Dot Area Ratio

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Experimental program
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Embodiment

[0066] With Adobe Photoshop as a tool,

[0067] (1) Make the main picture for printing: Create a new CMYK four-color digital file with a resolution of 2800dpi and a size of 5cm×5cm. , Y, and K channels are separated and processed with the custom screen function, that is, select a single channel to perform "image-mode-bitmap" processing, set the parameters to output resolution 2800dpi, use halftone screen, The frequency (number of screen lines) is 175lpi, the shape is circular, and the screen angles of C, M, Y, and K channels are 15°, 75°, 90°, and 45° respectively. Convert the information of the four channels into a grayscale mode, and the conversion ratio is 1.

[0068] (2) To make hidden text in the K version, the basic method is to write hidden text in the K channel, activate the font layer selection, and then delete the font layer. Put the navigator in Photoshop to the maximum (320%), use the move tool to move the text or image selection, namely:

[0069]

[0070] ...

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Abstract

The invention discloses a method for matching a simulation grating based on a hidden image lattice point area ratio. The method comprises the specific steps that a master print map is manufactured; a hidden text or image is manufactured on the manufactured master print map; a matching relation between the hidden image lattice point area ratio and a simulation matching grating area ratio is established according to hidden text or image parameters; a simulation matching grating is manufactured according to the established matching relation; the manufactured simulation matching grating is placed on the master print map to detect hidden information. According to the method for matching the simulation grating based on the hidden image lattice point area ratio, the precise matching relation between the hidden image lattice point area ratio and the simulation matching grating area parameters is obtained according to the matching algorithm between the hidden image lattice point area ratio and the simulation matching grating area parameters, the better showing effect after the simulation matching grating is added into a hidden image is achieved, the problems that according to an existing method, the matching degree of the hidden image and the simulation matching grating is not high, and the showing effect of the hidden image is not good are solved, the computing method is simple, and operation is convenient.

Description

technical field [0001] The invention belongs to the technical field of hidden anti-counterfeiting of printed images, and relates to a matching method of a simulated grating, in particular to a matching method of a simulated grating based on the dot area ratio of a hidden image. Background technique [0002] With the continuous development of printing technology, some pirates have also begun to obtain illegal benefits by imitating or duplicating various printed materials. Although new technologies such as paper anti-counterfeiting, ink anti-counterfeiting, pattern anti-counterfeiting, and 3D anti-counterfeiting are emerging, most of them are based on increasing costs. cost. The anti-counterfeiting method based on the combination of halftone image screening technology and grating material characteristics is simple and easy, does not have too high requirements for equipment and printing process, and will not increase production costs. It is a promising anti-counterfeiting metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00
Inventor 郭凌华邢铁豆刘国栋陈燕郭新华
Owner SHAANXI UNIV OF SCI & TECH
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