Abstract: A non-blind watermarking algorithm is proposed based on multi-wavelet transform and block singular value decomposition. Choosing the saturation component of a color image as the watermark embedding domain, the watermark is a meaningful grayscale image. After Arnold scrambling, watermark is embedded into the different mid-frequency regions of the saturation component which through multi-wavelet transform. The examples demonstrate that the algorithm not only has good robustness to the noise, JPEG compression, shear and Photoshop processing , but also can resist to some geometric attacks such as rotation, scale and translation.

Key words: computer application, image watermarking, multi-wavelet transform, block singular value decomposition