Image waterprint method for copyright protection

Abstract

The present invention discloses an image watermark way applied to protecting copyright. It converts two-dimensional pels matrix to a two-value sequence group, splits the original image into 8*8 pels in the pels area, and processes discrete cosine conversion to (DCT) convert every pels area to frequency area. By fake radnom selecting block texture selecting block and illumination selecting block, it can conform which area block need to embed the watermark, and can sort them Zigzag. It embeds the encryption part of the watermark sequence group into the direct-current factor position of the random selecting block, also embeds the texture part and illumination part into respective low frequency factor position.

Description

technical field [0001] The invention belongs to the technical field of information hiding and information security, and more specifically relates to a copyright protection method for image works in digital publications. Background technique [0002] With the rapid development of Internet technology and multimedia, the dissemination of digital products has become more convenient and faster. At the same time, due to its digital characteristics, digital products allow anyone to copy, disseminate and modify various electronic works at will, which greatly damages the interests of digital product copyright owners. As a branch of information hiding, digital watermarking can be used to identify the copyright owner of the work without affecting the visibility of the original product, and protect the legal copyright of online works. [0003] A practical method for the copyright protection of image works in digital publications needs to meet the following conditions: (1) the copyright...

AI Technical Summary

Problems solved by technology

If each watermarking system needs to achieve all the above functions, the complexity and time-consuming of the implementation will be greatly increased

[0006] (2) The form of the watermark is relatively abstract, which is not conducive to the court's certification of the copyright of the image work

However, this method can only obtain the conclusion of the existence or non-existence of the watermark, but cannot obtain the content of the watermark, and cannot clearly state the copyright ownership

[0007] (3) The embedding method does not apply

What is obtained during the test is only a data for relative comparison, which has no practical significance

In some technologies, when an image is used as a watermark, an image with a certain resolution must be extracted in the detection, and the accuracy requirements for each pixel value are greatly improved. In order to ensure imperceptibility and robustness to common image processing, when embedding It is necessary to make full use of the characteristics of the human visual system (HVS), and it is necessary to calculate complicated formulas, which increases the complexity and greatly increases the amount of calculation.

[0008] (4) The encryption mechanism is more complicated

The proposed watermarking scheme generally uses some kind of function to introduce encryption mechanism in the process of watermark scrambling or watermark generation, but in the process of using the function, the amount of calculation is large

[0009] In short, the existing image watermarking methods have shortcomings such as unclear use, abstraction and embedding, complex encryption methods, etc., and are not suitable for copyright protection and copyright certification of image works in digital publications.

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