Secret mark watermark extraction method and system based on mobile phone and image enhancement

Abstract

The invention relates to a secret mark watermark extraction method and system based on mobile phone and image enhancement. The phenomenon that human eyes are insensitive to yellow is utilized, a secret mark watermark of which the gray scale is within a preset range is artificially generated on the color channel; the printed matter printed with the secret mark watermark cannot perceive the watermark pattern by human eyes; when the mobile phone is used for shooting the printed matter; a watermark extraction algorithm and an image enhancement algorithm are used; an image or coded information andother contents of a secret watermark can be displayed on a mobile phone screen in real time; and after the printed matter is copied, the mobile phone shoots the copied product again, the secret mark watermark image disappears or weakens due to copying, secret mark watermark coding information can be obviously changed, and the mobile phone can accurately, conveniently and quickly judge whether theprinted matter is a genuine plate or a duplicate plate through an identification algorithm, so that the practicability is high.

Description

technical field [0001] The invention relates to a secret watermark extraction method, in particular to a secret watermark extraction method and system based on mobile phone and image enhancement. Background technique [0002] At present, the more convenient it is to copy documents, the higher the level of precision, which makes it more and more difficult to distinguish between original documents and copied documents. At present, the more common method is to use special paper or print with special ink to help people quickly distinguish the original document from the copied document, but this method increases the cost of use, and even requires the cooperation of special printing equipment, which limits other scope of use. Contents of the invention [0003] Purpose of the invention: to provide a secret watermark extraction method based on mobile phone and image enhancement, so as to solve the above-mentioned deficiencies in the prior art. A further object is to provide a sy...

AI Technical Summary

Problems solved by technology

[0002] At present, it is more convenient to copy documents, and the precision is getting higher and higher, which makes it more and more difficult to distinguish the original documents from the copied documents.

At present, the more common method is to use special paper or print with special ink to help people quickly distinguish the original document from the duplicate document, but this method increases the cost of use, and even requires the cooperation of special printing equipment, which limits other scope of use

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