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Moire pattern anti-fake method based on linear grating

A linear grating and straight line technology is applied in the field of moire anti-counterfeiting based on linear grating, which can solve the problems of low anti-counterfeiting quality and poor clarity of extracting hidden information, and achieve the effect of improving anti-counterfeiting quality and improving display clarity.

Active Publication Date: 2015-08-26
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a moiré anti-counterfeiting method based on a linear grating, which solves the problems of poor clarity and low anti-counterfeiting quality of existing moiré anti-counterfeiting methods for extracting hidden information

Method used

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  • Moire pattern anti-fake method based on linear grating
  • Moire pattern anti-fake method based on linear grating
  • Moire pattern anti-fake method based on linear grating

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] A moiré anti-counterfeiting method based on a linear grating of the present invention is specifically implemented according to the following steps:

[0033] Step 1, create a background color block:

[0034] Create an image in Photoshop with a size of 1-10cm×1-10cm and a resolution of 350dpi-2800dpi, using CMYK color mode, and the dot area ratio of the foreground color Cyan C, Magenta M, Yellow Y, and Black K is 20%-80 %; Separate the four channels of cyan C, magenta M, yellow Y, and black K to form image files of the four color channels. .

[0035] Step 2, screen processing:

[0036] Each channel is processed with the self-defined screening function, and the adopted method is: half-tone screen, the parameters are set to output resolution 350dpi-2800dpi, and the frequency (number of screening lines) is 80LPI-200LPI. Among them, the ...

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Abstract

The invention discloses a moire pattern anti-fake method based on a linear grating. The moire pattern anti-fake method specifically comprises the steps that firstly, a background color block is established, and four channels in the background color block are separated; secondly, screening processing is carried out on the channels, the net points of the channel in which hidden information is embedded are in a straight line shape, and the rest of the channels are circular; thirdly, a hidden image is manufactured; fourthly, a digital image comprising the hidden information is manufactured; fifthly, the linear grating is manufactured; sixthly, the hidden information is extracted. The hidden information is embedded in one channel on which screening is carried out through the straight line, conventional net point screening is adopted for the other channels, and finally the hidden information is extracted through the matched linear grating. The digital image in which the hidden information is embedded has a very good hiding effect; when the hidden information is extracted, the hidden information is highlighted through the sharp contrast of the area density and the color displaying of the hidden channel, the displaying definition of the hidden information is improved, and therefore the moire pattern anti-fake quality is improved.

Description

technical field [0001] The invention belongs to the field of printing anti-counterfeiting and relates to a moiré anti-counterfeiting method based on a linear grating. Background technique [0002] Moiré anti-counterfeiting is an anti-counterfeiting technology based on the combination of halftone screening technology and Moiré effect. This method is simple and easy to implement, does not require too much equipment and printing technology, and can achieve the purpose of anti-counterfeiting without increasing production costs. Therefore, moiré anti-counterfeiting is a promising anti-counterfeiting method. However, the clarity of the hidden information extracted by the current anti-counterfeiting method is not good, and its anti-counterfeiting quality needs to be improved, so that it can be better applied in actual production. Contents of the invention [0003] The object of the present invention is to provide a moiré anti-counterfeiting method based on a linear grating, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41M3/14
Inventor 郭凌华陈燕邢铁豆刘国栋
Owner SHAANXI UNIV OF SCI & TECH
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