RGB video coding using the matched neighbourhood block in the inter-color plane

H.264/AVC High 4:4:4 Intra/Predictive profiles supports RGB 4:4:4 sequences for high fidelity video. RGB color planes rather than YCbCr color planes are preferred by high-fidelity video applica- tions such as digital cinema, medical imaging, and UHDTV. Several RGB coding tools have therefore been developed to improve the cod- ing efficiency of RGB video. In this paper, we propose a new method to extract more accurate correlation parameters for inter-plane predic- tion. We use a searching method to determine the matched macroblock (MB) that has a similar inter-color relation to the current MB. Using this block, we can infer more accurate correlation parameters to pre- dict chroma MB from luma MB. Our proposed inter-plane prediction mode shows an average bits saving of 15.6% and a PSNR increase of 0.99dB compared with H.264 high4:4:4 intra-profile RGB coding. Furthermore, extensive performance evaluation revealed that our proposed algorithm has better coding efficiency than existing algorithms.