A gray-scale image watermarking technique using the contrast sensitivity function masks

This paper proposed a new technique to ernbeda watermark signal in a gray-scale image. This technique incorporates the human visual system using two dferent contrast sensitivity function masks. These masks are used to weight the wavelet coepcients of the discrete wavelet transform of the host image. Both the embedding and extraction algorithms are given. The experimental results show that the proposed technique achieved the invisibility and robustness requirements.