నైరూప్య

Performance Evaluation of Watermarking Technique using Full, Column and Row DCT Wavelet Transform

Dr. H. B. Kekre, Dr.Tanuja Sarode, Shachi Natu

A watermarking technique using full, column and row DCT wavelet is proposed in this paper. Perceptual imperceptibility of watermarked images is improved by embedding compressed watermark. Further, this compressed watermark is normalized and scaled by suitable scaling factor to improve the robustness of proposed scheme. Performances of full, column and row DCT wavelets are compared against various attacks. In all, it has been noticed that column and row transform significantly reduces computational cost of the technique. Also, for attacks like JPEG compression, compression using various transforms, binary and Gaussian distributed run length noise attack, resizing attack where full DCT wavelet fails to give robustness, column and row DCT wavelet transforms show strong robustness at less computational cost.