Digital watermark anti fake method in anti-digital-to-analog conversion process

Abstract

The method includes steps: (1) watermark algorithm is adopted in step of embedding watermark; binary digital watermark including special information is embedded in selected special region of object to be protected; (2) step for determining watermark picked up. Characters are that the special region includes foreground image and background image; halo process is carried out for fringe of the foreground image; synchronized signal reflecting geometric features of foreground image is setup before watermark is embedded. Information of watermark is represented by two defined different modes of image block. Watermark is extracted by comparing a decided threshold value with variance of pixel value of image block. Using relativity between extracted watermark and original watermark determines whether watermark is authentic. The invention partitions foreground image from background region so as to prevent original image from distortion. The invention resists attack of printing and scanning.

Description

Technical field [0001] The invention relates to a watermark anti-counterfeiting method, in particular to a digital watermark anti-counterfeiting method resisting the process of digital-to-analog-to-digital conversion. Background technique [0002] As a novel information hiding technology, digital watermarking provides a new solution to a series of problems on open networks, such as copyright protection, source authentication, tampering authentication, online distribution, user tracking, and identity authentication. However, most people now focus on the research of digital watermarking technology for digital images, audio and video. There are few researches on digital watermarking algorithms that use documents and binary images as carriers. Documents and binary images are used as the carrier. The difficulty in the design of the digital watermarking algorithm of the carrier is that the document or binary image can represent the entire image with only two different gray values. Ther...

AI Technical Summary

Problems solved by technology

But now people mostly focus on the research of digital watermarking technology for digital images, audio and video, and there are few researches on digital watermarking algorithms that use documents and binary images as carriers. The difficulty in the design of the digital watermarking algorithm of the carrier is that the document or binary image can represent the entire image with only two different gray values. There are almost no textures and details, and some are just different geometric shapes. Using such It is difficult for the carrier to design an algorithm that meets the requirements of digital watermarking

However, documents and binary images are widely used, including digital signatures, handwritten signatures, text, etc. The research on its protection issues is of great significance from practice to theory, and now it can provide both the verification function of the digital domain and the There are few examples of anti-counterfeiting functions using documents and binary images as carriers after digital-to-analog and analog-to-digital conversion processing. General electronic encryption technology or digital watermarking algorithms only provide anti-counterfeiting functions in the digital domain for documents, and cannot resist geometric attacks and similar printing. Scanned modulus and digital-analog attacks cannot play an anti-counterfeiting function in the analog domain

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