Abstract: With the re-emergence of 3D video technology,the format based on 3D video has been used widely,and the coding algorithm aiming at the depth map has become a hot research in recent years．Different from the image coding based on wavelet transform,we proposed a novel scheme based on the correlations of intra-subband．The scheme is performed in the wavelet quantization coefficients．Firstly,we predicted the coefficients in the horizontal and vertical directions by using the diagonal subband in the same level．Then,we made use of four coefficients to predict the correspon-ding coefficient in the adjacent level．Finally,we performed arithmetic coding for atom-band coefficients and the residual values after prediction．The experimental results show that the proposed scheme in this paper keeps the quality of depth map,while up to 18.4% bit rate can be saved.

Key words: Depth map,Wavelet transform,3D video,Image coding