A WAVELET-BASED FRACTAL WATERMARKING ALGORITHM COMBINED WITH ZERO-TREE FOR DIGITAL IMAGES
Xiaoping Cheng · Xi'nan Nongye Daxue xuebao · 2006
A digital watermarking technique that combines fractal coding and wavelet transformation is proposed,using for reference the wavelet-based watermarking algorithm and the theory of fractal image compression and combined with wavelet-zero trees coding.The technique makes full use of the respective advantages of the wavelet-zero trees,the wavelet transformation and fractal coding to improve the quality of the watermarking images and boost up the robustness of the watermarking.