Digital Image Watermarking Algorithm Based on Wavelet Packet
In this paper, a method for Digital Image Watermarking based on the modification of certain subband of the wavelet packet decomposition was presented. A key is used for wavelet bases selection, watermark generation and selection of blocks for embedding the watermark bits. To efficiently embed the watermark within the images and provide the robustness for the watermark detection under attacks, watermark is embedded by quantizing the mean of the wavelet coefficient block. A method for exploiting Human Visual System (HVS) characteristics in wavelet packet domain is presented. In this method original image is not needed and only secret key is required for extracting the watermark.