A wavelet watermarking algorithm based on the excellent property of chaotic sequence and some characteristics of the human visual model is proposed in this paper. Firstly

the multilevel wavelet decomposition of digital image is involved

and then combined with the white noise statistical characteristics of chaotic sequence and the contrast sensitive function of human visual

chaotic sequence is added to the wavelet coefficients of the high pass bands from the low resolution to the high resolution which are important to the human visual. Finally

watermarked image is obtained by using reverse wavelet transform. Because the chaotic sequence is very sensitive to the initial value

the attackers cannot deduce the whole sequence from the finite sequence and the security of watermark information is ensured. At the same time

combined with the human visual model

our algorithm guarantees the visual impression and protects the low frequency part of image efficiently. Experimental results show that the proposed scheme has good robustness and imperceptibility to common information processing operations and noise attack.