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Butt joint forgery prevention method based on Moire pattern mechanism

A moiré pattern and mechanism technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of poor clarity of hidden information extraction, simple hidden form, etc., meet the requirements of fine production, improve anti-counterfeiting quality, and clear The effect of increasing

Active Publication Date: 2015-05-20
SHAANXI UNIV OF SCI & TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a docking anti-counterfeiting method based on the moiré pattern mechanism, which solves the problems of poor clarity of hidden information extraction and simple hidden form in the existing moiré pattern anti-counterfeiting method

Method used

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  • Butt joint forgery prevention method based on Moire pattern mechanism
  • Butt joint forgery prevention method based on Moire pattern mechanism
  • Butt joint forgery prevention method based on Moire pattern mechanism

Examples

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Embodiment 1

[0043] Taking the hidden information embedded in the blue and magenta versions as an example, the production and operation process of the present invention will be described in detail.

[0044](1) Create a background color block. The size of the image created in Photoshop is 5cm×5cm, the resolution is 2400dpi, and the color mode is CMYK. Fill the dot area ratio of foreground color C, M, Y, K to 20% respectively. Separate the four-color channels, perform "image / mode / bitmap" processing, set the parameters to an output resolution of 2400dpi, use a halftone screen as the method, and use a frequency (screening line number) of 175LPI, and the shape is a circle, C, M, Y The screening angles of the four channels of , K are 15°, 75°, 90°, and 45° respectively. After setting, perform "image / mode / grayscale" processing, and the conversion ratio is 1.

[0045] (2) Make a hidden image. First draw hidden information graphics in Coreldraw software, the canvas size is 50mm×50mm, and save i...

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Abstract

The invention discloses a butt joint forgery prevention method based on the Moire pattern mechanism. The method comprises the following steps of establishing a background color block, separating a green C passage, a magenta M passage, a yellow Y passage and a black K passage, and respectively processing the four passages by use of a user-defined net setting function, wherein the net point is round; manufacturing a hidden pattern which has the same size and resolution ratio with the background color block; partitioning the hidden pattern into two hidden pattern layers; respectively embedding the two partitioned hidden pattern layers into a green version and a magenta version, and combining the four passages, thereby finally forming a digital pattern containing hidden information; manufacturing a matched butt joint grating; and superposing the manufactured butt joint grating on the digital pattern and extracting the hidden information. According to the method, a contrast effect is generated during hidden information extraction, so that the definition of the hidden information extraction is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of printing anti-counterfeiting, and in particular relates to a docking anti-counterfeiting method based on a moire mechanism. Background technique [0002] Moiré anti-counterfeiting is an anti-counterfeiting technology based on the combination of halftone screening technology and Moiré effect. The 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, grating anti-counterfeiting is a promising anti-counterfeiting method. However, the hidden information extraction clarity of this anti-counterfeiting method is not good at present, and further improvement is needed. In addition, the hidden form is simple, and the difficulty of forgery needs to be enhanced, so as to finally improve the anti-counterfeiting quality of the moiré anti-counterfeiting method and make it bett...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 郭凌华陈燕邢铁豆刘国栋
Owner SHAANXI UNIV OF SCI & TECH
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