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Robust watermark research based on wavelet transform

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Tutor: SunXingHua
School: Nanjing University of Technology and Engineering
Course: Applied Computer Technology
Keywords: Digital Watermarking,Image Scrambling,Discrete Wavelet Transform,Watermarking Ca
CLC: TP309.7
Type: Master's thesis
Year:  2009
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This paper systematically expounded the concept of digital watermarking technology , the relevant characteristics of the basic principles , the theoretical model of digital watermarking , with detailed descriptions of common watermark attacks . Also explained the basic principles of the wavelet transform , the basic process of wavelet domain watermarking algorithm . And in accordance with the human visual system ( HVS ) , a digital watermarking technology method based on discrete wavelet transform (DWT) . Firstly, image watermark Arnold scrambling , the number of scrambling as the key of the digital watermarking system , to improve the security of the watermarking system ; Haar wavelet is selected as the wavelet basis , scrambling the watermark and original the images do one , three wavelet transform ; then the original image after wavelet transform layers wavelet analysis , to select the appropriate embedded position and repeat the layers of the watermark embedded in the wavelet transform image layers . When using the hierarchical method of extracting the watermark extraction , higher accuracy . The method takes full advantage of multi-resolution feature of wavelet analysis . Experimental results show that the algorithm in a certain extent, improve the capacity of the watermark and the robustness of the algorithm processing , image shearing , JPEG compression attacks .
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