Distortion-correcting algorithm of intracoding for flat region in depth map

An efficient distortion-correcting algorithm for the intra-coding of a depth map is presented by considering the property of the flat area in a depth map. The influence of the distortion of reference pixels on the rate-distortion (RD) cost function of the macro-block (MB) in a flat region of a depth map is analysed. Then, the RD performance of the flat region is improved by correcting the distortion of the first MB in the flat area on the basis of this analysis. Experiments show that the performance of the synthesis view of the proposed method can achieve average peak signal-to-noise ratio (PSNR) of 0.32 and 0.30 dB compared with the JMVC8.5 and the plane segmentation-based intra-prediction method, respectively.