Design of digital watermarking algorithm based on wavelet transform

A blind watermarking algorithm based on wavelet transform domain is proposed. This algorithm use two-level wavelet transform on the original image. Reference the coefficients of level detail sub-band in one-level wavelet transform and adjust the two-level wavelet coefficients in the same direction adaptive to achieve embedded watermark information. The result shows that the embedded watermark has good transparency and robustness, and the watermark can be extracted from the watermarked image without the original image.