Improved method for jitter quantisation and watermark modulation

Abstract

The invention relates to an improved dither modulation (DM) watermarking method and belongs to the technical field of digital watermarks. Compared with a statistical watermarking method of known carrier signal such as spread spectrum watermarking, original DM has the advantages of higher watermark capacity and has the disadvantage of high sensitivity to amplitude scaling attack. The invention constructs a signal invariable relative to the scaling for quantification by using a method which comprises: extracting from original content a statistical characteristic sequence which has a characteristic of scaling with original data according to the same scale factor; and obtaining the signal invariable relative to the amplitude scaling by dividing a carrier signal by the introduced characteristic sequence correspondingly. Watermark embedment and detection operation are both carried out on the newly constructed signal. The method improves the robustness of watermarks to amplitude scaling greatly and obtains watermarking performance similar to the original STDM watermarking in other aspects.

Description

technical field [0001] The invention belongs to the technical field of digital watermarking, and in particular relates to an improved jitter quantization modulation watermarking method. Background technique [0002] The past decade has seen an explosion in the use and distribution of digital media information. With the help of the Internet, people can easily publish and obtain various digital information, including images, audio, video and text, as well as many online services. But at the same time, piracy has become easier. Unrestricted copying and uncontrollable transmission make digital content copyrightless. The management and protection of digital content has become an urgent problem to be solved in the industry. [0003] Digital watermarking is an emerging copyright protection technology. It studies how to hide a certain amount of additional information in the original data, such as the ownership of the work, the right to use or the company's logo, etc., and achieve...

AI Technical Summary

Problems solved by technology

The performance of this method relies on the human perception model, which is not flexible enough, and the modification of the perception model loses the quality of the carrier signal compared to the case without modification

[0012] In summary, in the known quantitative watermarking technology, the problem of amplitude scaling attack has not been well solved, and several existing methods have corresponding deficiencies

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