A new second generation watermarking method based on DWT was presented in the paper.Based on the model of CBWM

this algorithm applies the visual masking of HVS to the code of watermark.and introduces concept of wavelet block.At first

the algorithm extracts the most important image characteristic value from the coefficients of wavelet transformation as watermark information.And then

it embeds the watermark to decomposing layer of image by modulating.When extracting watermark

the characteristic value is acted as position reference point of watermark.Experiment results show that the watermarking algorithm is robust against common geometry attacks and special anti-interference resistance to rotation.