这个是我拿有道直接翻译的。。。。见笑了。。。。
Digital watermarking technology is a kind of effective digital products copyright protection and data safety maintenance technique, is the information hiding technology is an important research field of the branch, has already been international academic and corporate interest. In real life, digital watermarking technology has been used widely in digital works of intellectual property protection, the business transactions, audio &video data of tampering with security hidden logo and tampering with tips, etc.
This paper studies the phones based on digital watermark authentication security solution pictures using digital watermarking technique realization. Printed anti-counterfeiting This method consists of digital watermarking embedding and prints authenticity testing two parts. Embedded in the carrier image does not affect its visual sense of digital watermarking, the time after printing become genuine literature; With suspected fake prints of its using cell phones, then photographed acquisition image testing.
This research according to the size of the watermark image to bar carrier image region DCT transform, the selection of low-frequency coefficients, and in these coefficient amplitude small amplification modification, and through the modification coefficient of plus or minus sex symbols to embed watermark binary code. According to the watermark image block DCT coefficients after the watermark, plus or minus sex to extract watermark extraction realize a blind extraction. By setting right threshold can judge the original image authenticity. The simulation results verify the algorithm has very good visibility, conform to the requirements of anti-counterfeiting technology prints.
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