Region Adaptive Inter-Color Prediction Approach to RGB 4:4:4 Intra Coding

RGB color signals encoding is more desirable for high resolution and accurate definition for saturations and hue. This paper presents a region adaptive inter-color prediction scheme for 4:4:4 RGB signals, which treats G component as a primary component and predicts B/R component from G component with different weighting factors based on different texture regions. The proposed algorithm demonstrates more efficient coding performance both than the H.264/AVC intra coding algorithm and than the block adaptive prediction algorithm. Experimental results show that, compared with the H.264/AVC intra coding algorithm, the proposed algorithm can produce a bit-rate saving of up to 26-30% with PSNR gain of 0.3-0.5dB for some high resolution video sequences and low resolution static images. Meanwhile, the complexity of the proposed algorithm is much less than that of H.264/AVC intra prediction technique in independent mode.