A blind digital watermarking algorithm based on wavelet transform

In recent years, digital watermarking technology is a frontier research area in academia, which is proposed to deal with copyright protection problem in a network environment. In the paper, a blind digital watermarking algorithm based on wavelet transform is proposed. After wavelet transform, we get the wavelet coefficients of a image. According to the Euclid distance between every two coefficients, all wavelet coefficients are classified into several classes. Then watermark is embedded into some fit coefficients. It needn´t the original image in the process of extracting watermarking, so it is a blind watermarking algorithm. The experimental results show that it is a highly robust algorithm against JPEG compress, the addition of noise, median filtering and cropping.