关键词: H264, 可分级视频编码扩展； 层间预测； 模式选择

Abstract:

To reduce the computational complexity of quality scalable video coding (SVC)， a three steps included fast mode decision algorithm is proposed. In the first step， skip modes which require little computational complexity are checked; afterwards， candidate modes are selectively searched according to the interlayer correlation; finally， the rest unchecked modes are calculated. If the minimal RateDistortion (RD) cost obtained in the first or the second step is smaller than the predefined threshold， early termination is trigged. Experiment demonstrate that， compared with the exhaustive search method， 459%808% encoding time can be saved by the proposed algorithm. The Peak Signal to Noise Ratio (PSNR) reduction is 025dB at most and the bit rate increment is 062% at most.

Key words: H264, scalable video coding, interlayer prediction, mode decision