Scanning and copying prevention method based on gray scale image light watermarking

Abstract

Provided is a canning and copying prevention method based on gray scale image light watermarking. Grading processing is performed on image gray scales, light watermarking is expanded from a binary domain to a gray scale domain, a gray scale image light watermarking algorithm is brought forward, a watermarking area can be presented in a certain form, and detailed elaboration is performed on a basic lattice generation rule, a single-layer watermarking embedding method, a multilayer watermarking superposing method and a weight watermarking contrast evaluation method of the gray scale image light watermarking. On such a basis, through combination with a fuzzy effect of edge diffusion generated in a scanning and copying process, a layer of canning and copying prevention watermarking is constructed, the layer of watermarking is superposed with other gray scale image light watermarking, and a document picture is embedded so as to achieve a canning and copying prevention effect of a printed document.

Description

technical field [0001] The invention relates to a multimedia digital watermark construction, embedding, superposition and detection method, in particular to an anti-scan copying method based on a grayscale image optical watermark. Background technique [0002] With the continuous advancement of modern technology, electronic documents are used more and more widely, but some important documents still need to be disseminated in the form of paper through digital printing technologies such as printers, scanners or copiers. How to identify the original documents in the process of dissemination The problem of copying has been paid more and more attention by people. The development of science and technology has reduced the cost of making copies of original documents, which in turn has made problems such as forgery and piracy more serious, and can easily cause major political or economic losses to society or individuals. Therefore, it has become a serious social problem to effective...

AI Technical Summary

Problems solved by technology

However, the current optical watermarking research is mainly concentrated in the field of binary images. Since the optical watermarking of binary images is only processed in the binary space, the contrast between the foreground and the background is large, so the generated watermark is a messy picture; and If it is extended to the grayscale space, since the grayscale image has a stronger ability to express things, if the contrast between different grayscales is cleverly used, some applications can be increased.

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