AN ADAPTIVE FUSION ALGORITHM BASED ON WAVELET TRANSFORM

A watermark algorithm based on Human Visual System (HVS) is proposed. After triple level full wavelet transform is applied on carrier image and watermark image, two wavelet coefficient trees containing 64 leave nodes are obtained. Because Fusion intensity of each sub-band image is determined based on the JND threshold of each leave node, the algorithm is self-adaptive. It is proofed by experiments that the algorithm has several advantages such as high security and stability against attacks. It can be applied on the field of digital copyright protection.