Research Of Image Digital Watermarking Based On Wavelet Domain And Fractal Theory

The thesis gives a brief summary to the characteristic and classification of the image digital watermarking,the image digital watermarking frame and its algorithms.In view of some algorithms'insufficient to the invisibility and the anti-geometry attack , the thesis conducts a priliminiary research on the relationship of the fractal and wavelet theories,and analyses the combinations between them combining the characteristic of the fractal and the wavelet. The work in this thesis includes:First,The thesis applies fractal theory in the image digital watermarking,then improves a digital watermarking algothrim in spatial domain based on the IFS.Then the embedding and extraction was implemented with the significance watermarking.At last , a standard test was implemented considering its insufficient.Secondly,A new digital watermarking algothrim based on wavelet domain and the IFS was put forward in view of its insufficient to the anti-geometry attack and the compound attack.At the same time,the attack methods of StirMark were used in standard attack test,which tested the realiability of the empirical datum and proved its resistance to the geometry,the JPEG compression and compound attack methods.Futher more,the good combination between the fractal and the wavelet was manifested.Finally,this thesis constructed a digital watermarking platform based on StirMark's attack algorithm with VC++.NET,then took a standard attack test with it.In view of the image digital watermarking based on the spatial domain and the wavelet domain,many attack methods were tested,Such as images convfilter, rotation,JPEG compression,delete lines, geometry ,distortion, rotation and cropping, and the most StirMark attack algorithm. At last,the thesis analysised the empirical dataum , this confirmed that the image digital watermarking algorithm based on the fractal theory can enhanced the resistance to the geometry deformation in some extent.