Abstract: The importance of video sectuence varies with the regions, and human visual sensitivity too varies with the importance of region of video sequence, so the subjective duality requirement of region of interesting is not the same as non-region of interesting. Although there arc very many researches on region of interesting, it is few research which joints the overall Rl)optimal theory, the rate control, infra macroblock refreshment and the region of interesting. So the paper proposed the RD optimized infra refreshment algorithm based on region of interesting, and it was used the overall end to end distortion theory to analyse the region of interesting and non-region of interesting, and gave more infra refreshment chances to the marcoblock in region of interesting, as the bit rate was constrained, so the bit rate of the region of and non-region of interesting must be reallocated. At last, the algorithm was implemented in reference software JMl2. 2 of J VT. The simulation results showed that, comparing with the traditional RD optimized infra refreshment algorithm, the proposed infra refreshment algorithm based on region of interesting could obtain a better subjective quality of the reconstructed video in the region of interesting at the decoder.

Key words: Region of interest, RD optimal, Intra refreshment, Rate control, H. 264/AVC