A Blind Digital Watermarking Algorithm Based on Wavelet-packet Transform

In this paper,a blind watermarking algorithm for digital image based on wavelet-packet transform is introduced.This algorithm manipulates the original image by wavelet-packet transform,then adds watermark onto the important wavelet coefficients located in the high frequency subband based on human visual system.The experiment results show that the watermarking is robust and practicability to the common image processing techniques.