Abstract
Key words: data hiding, wavelet transform, adaptive In this paper, we propose an adaptive data hiding method in the frequency domain. We divide original image into 8*8 sub-blocks and use Haar Discrete Wavelet Transform (HDWT) to decompose each block to obtain sub-bands, LL, HL, LH and HH. A data hiding capacity function is proposed to analyzes each band except LL. It can be used to judge the hiding length of each coefficient of each band and to decide whether the subbands LH, HL and HH are complex or not. If these three sub bands are complex, the LL band is further decomposed and more data bits and be embedded. We compare our method with other method. From the experiments, we find that the proposed method has a larger data hiding capacity than that of other method.