Horizontal Spatial Prediction for High Dimension Intra Coding

Intra picture coding plays an important role in video coding algorithms. In this paper, we investigate the pixel spatial correlation in HD picture and propose a macroblock level horizontal spatial prediction(HSP) based intra coding method. Because the pixels have the absolutely stronger correlation in horizontal direction than that in the vertical direction, each macroblock will try to be divided into left and right partitions. The right partition will be encoded with the conventional intra mode and then the reconstruction of it will be used to predict the left partition. The strong correlation between the right and left will contribute to the left partition significantly, and the encoding efficiency can be improved for the intra macroblock. With the decision of RDO, about 30-60% macroblocks will benefit from the HSP based intra coding. The experimental results show that the proposed intra coding scheme can improve the encoding efficiency with 0.17dB in average and has the potential to be further improved.