Image anti-counterfeiting method based on color grating

An image and color technology, applied in the field of grating anti-counterfeiting, can solve problems such as edge blurring, achieve contour enhancement, maintain smoothness, and improve recognition clarity.

Active Publication Date: 2019-07-23
NANJING FORESTRY UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional error diffusion algorithm generally takes the quantization threshold as an intermediate value of 128, but the traditional error diffusion algorithm is prone to edge blurring. Combined with the above, it leads to technical bias in the application of FM screening in the grating anti-counterfeiting technology

Method used

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  • Image anti-counterfeiting method based on color grating
  • Image anti-counterfeiting method based on color grating
  • Image anti-counterfeiting method based on color grating

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Embodiment Construction

[0062] Now in conjunction with the accompanying drawings, the structural features of the present invention will be described in detail.

[0063] This embodiment provides an image anti-counterfeiting method based on color gratings, which breaks traditional technical prejudices and adopts an improved FM screening algorithm to obtain an original image halftone image carrying anti-counterfeiting information and a matching color grating. The method of this embodiment not only improves the blurred phenomenon of the edge of the FM screen, but also realizes the possibility of hiding and identifying the anti-counterfeit information in the carrier image through the algorithm of the FM screen. Specifically, it includes the following steps:

[0064] Step (1), color separation

[0065] see figure 1 , in the image processing software, input the original image, the color mode of the original image is CMYK four-color mode, the original image is color-separated to obtain four corresponding co...

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Abstract

The invention discloses an image anti-counterfeiting method based on a color grating, and the method comprises the following steps of 1, carrying out the color separation, carrying out the color separation of an original image, obtaining four corresponding color separation images, selecting one color separation image as a carrier image of the anti-counterfeiting information, and enabling the otherthree color separation images to be an image to be synthesized; and step 2, binarizing the carrier image and the like. The extraction definition of the color grating is superior to the extraction definition of a black-white grating, according to the invention, the grating identification technology is expanded from an amplitude modulation image to a frequency modulation image, the local tone of the amplitude modulation screening is expanded to the full tone, and the application limitation of the color grating in the grating anti-counterfeiting technology is broken through.

Description

technical field [0001] The invention belongs to the field of grating anti-counterfeiting, in particular to an image anti-counterfeiting method based on a color grating. Background technique [0002] In recent years, optics has made a series of research progress in the field of information security and image encryption, using technologies such as rainbow holography, moiré fringes, and optical variable devices to prevent illegal copying of confidential documents and certification information. Modern optical information hiding usually uses the key function to optically transform or process the host image, so as to embed the carrier image in the airspace to complete the information hiding. Among them, the grating anti-counterfeiting technology based on the phase modulation latent image method has great advantages because of its convenience. Advantage. [0003] In the information hiding stage, the anti-counterfeiting information is directly embedded in the screening process; in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
CPCG06T1/0021
Inventor 王琪韩雪莹
Owner NANJING FORESTRY UNIV
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