H.264 Based Complexity Scalable Control Algorithm under Energy Constraints

In order to control the complexity of H.264encoder, we first proposed two effcient Complexity allocation and control (CAC) algorithms for both intra andinter coding respectively, based on a new Rate-distortioncomplexity optimization (RDCO) framework and the rearrangement of candidate modes according to the local-edgesand texture analysis. The CAC algorithms can be performed both at the frame level and the Macroblock (MB)level; then, within the proposed CAC algorithms, a wholecomplexity scalable control algorithm was given. Experimental results show that our proposed algorithm can makean appropriate cut-off point for the candidate modes sequence adaptively according to current energy conditionof a mobile device, so as to adjust the complexity at anytarget levels with minimum degradation in video quality.This can prolong the operational lifetime of the battery forhand-held devices.