In order to design an image watermarking algorithm with high robustness

through the analysis of watermark embedding process

extracting process and performance

this paper presents a new scheme of Image adaptive Gray-scale Watermark Embedding and Extracting. After analyzing the characteristics of multiresolution of the two-dimension discrete wavelet transform

by using luminance sense and contrast sensitivity threshold of the Human Visual System and integrating the luminance and texture characteristic of each sub block of the image

the scheme embeds a gray-scale watermark into a host image according to the adaptive embedding intensity factor calculated. The optimal watermark extracting result can be calculated adaptively according to the watermark information extracted from different regions

which greatly improves the performance of the watermark system. The experimental results prove that the scheme is robust enough to many attacks

especially to smoothing

filtering

JPEG or JPEG2000 compression and bit plane cutting.