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Research and Implementation on Practical Digital Watermarking Algorithm

Author: AiHongYan
Tutor: LiuQuan
School: Wuhan University of Technology
Course: Communication and Information System
Keywords: Digital Watermarking Technology Dual Polarity Dither ModulationAlgorithm Lens Segmentation algorithm JND DEW
CLC: TP309.7
Type: Master's thesis
Year: 2012
Downloads: 44
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Abstract


With the development of multimedia and network technology, the problem of illegal copying, modifying and disseminating the audio and video works are getting worse. The digital watermarking technologies of audio and video are the very way out of the problem and has attracted extensive attention. The strong feasible watermarking schemes of audio and video should consider their redundancy data and compressed process, besides, being combined with the human psychoacoustic model, they should get the balance among the imperceptibility, robustness, synchronization, the real-time nature and security.Two watermarking schemes are proposed based on the analysis of a number of related references. One is the synchronization audio watermarking algorithm research based on DCT quantization, and the other is the improved DEW compressed video watermarking algorithm based on Watson visual model. Then, applied this two corresponding algorithm to the actual copyright protection system of DRM, in order to solve the problem of copyright disputes.Firstly, the synchronization audio watermarking algorithm research based on DCT quantization uses the energy threshold to eliminate the "mute" area, so that it can select the right watermarking embedding area. Secondly, dividing the specific carrier audio signals into the frames which having the same length. Thirdly, embedding the synchronous codes into every audio frame to resist the corresponding synchronization attacks. And then, selecting the specific watermark embedding coefficients based on the characteristics of DCT transform. At last, using the dual polarity dither modulation algorithm to embed the watermark information.In the area of selecting watermark embedding video frames, the improved DEW compressed video watermarking algorithm based on Watson visual model uses the double threshold lens segmentation algorithm to decompose the original video sequence into several independent scenes. And then selects the frames of biggest characteristic value to be the watermarking frames. In the process of embedding, making full use of Watson visual perception model to adjust the DCT coefficients of the corresponding blocks, then calculating the JND values. Moreover, on the premise of non-affecting the visual efficient, by using the JND values can guarantee the embedding capacity to the greatest degree. And for the very good consideration of the balance between the robustness and video quality, we make some improvements on the basis of the traditional DEW watermark embedding algorithm. Furthermore, this algorithm no longer only chooses single high frequency coefficients. It selects the sub low coefficients to do some corresponding range modification. Certainly, it also simplified the corresponding energy calculation formula, and makes a further reduction of the complexity of this algorithm, and it also partly improves the real-time performance.Do experiments on the corresponding watermarking framework, and then giving the corresponding results and comparison data of related documents. Experiments prove that the audio and video watermarking scheme performs well in imperceptibility, watermark capacity and the robustness to resist the temporal synchronization attack, White Gaussian Noise attack and compression attack. And they all have good performance of real-time nature and can resist various compressed attack.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Security and confidentiality > Encryption and decryption
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