A Moiré anti-counterfeiting method based on linear grating

A linear grating and linear technology, applied in the field of moiré anti-counterfeiting based on linear gratings, can solve the problems of low anti-counterfeiting quality and poor clarity of extracted hidden information, and achieve the effect of improving anti-counterfeiting quality and display clarity

Active Publication Date: 2017-06-23
SHAANXI UNIV OF SCI & TECH
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  • Claims
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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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  • A Moiré anti-counterfeiting method based on linear grating
  • A Moiré anti-counterfeiting method based on linear grating
  • A Moiré anti-counterfeiting method based on linear grating

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Embodiment Construction

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

[0032] The moiré anti-counterfeiting method based on 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 with a size of 1~10cm×1~10cm and a resolution of 350dpi~2800dpi in Photoshop. The CMYK color mode is adopted, and the dot area ratio of the foreground color is cyan C, magenta M, yellow Y, and black K 20%~80 %; The four channels of cyan C, magenta M, yellow Y, and black K are separated to form image files for each of the four color channels. .

[0035] Step 2, Screening processing:

[0036] Use the custom screening function to process each channel separately. The method used is: halftone screen, the parameter is set to output resolution 350dpi ~ 2800dpi, frequency (screening line number) is 80LPI ~ 200LPI. The channel where the hidden inf...

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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 the moiré effect. The method is simple and easy to implement, does not require too much equipment and printing process, and can achieve the purpose of anti-counterfeiting without increasing production costs. Therefore, moiré anti-counterfeiting is a promising anti-counterfeiting method. However, the current anti-counterfeiting method has poor clarity in extracting hidden information, and its anti-counterfeiting quality needs to be improved so that it can be better applied in actual production. Summary of the invention [0003] The purpose of the present invention is to provide a moiré anti-counterfeiting method based on a linear grating, which solves the problems...

Claims

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Application Information

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Patent Type & Authority Patents(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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