Digital Image Watermarking using wavelet packet and hybrid Filter

In this paper, a new digital image watermark algorithm using wavelet packet transform and hybrid filter is proposed for right protection. The proposed watermark algorithm applies watermark to the overall subband that include the lowest frequency band and uses hybrid filter to remove the noise that was added to the watermarked image. The hybrid filter consists of median filter and wiener filter. Simulation analyzes PSNR and similarity of the watermarked image to test the quality and robustness of the watermarked images. From the simulation results, the proposed algorithm shows better invisibility and robustness performance compare with conventional wavelet transform based watermarking methods.