A watermark embedding scheme in wavelet transform domain

In this paper, an efficient watermark embedding scheme is presented in the wavelet transform domain. A pseudorandom sequence is weighted using a weighting function and then embedded to the wavelet transform coefficients of a host image. The proposed new weighting function consists of a perceptual mask and a reliability mask, which take into account, respectively, the imperceptibility and the robustness of the marked image. A detection algorithm based on the correlation of the watermark and the marked image is also proposed. Simulation results show that the proposed embedding algorithm is very robust against various attacks including compression, cropping and low-pass filtering.