H.264整数变换零块的预先判决算法

基于H.264整数变换和量化的特点，在选择最佳预测编码模式的过程中，预先判决变换系数量化后可能全部为零的块，特别是假定图像块未发生位移，其帧差信号变换系数判决为零的块，则可省去位移估值、变换、量化等复杂过程．与不用预先判决零块算法相比，在恢复图像平均峰值信噪比下降不到0.1dB的情况下，使用预先判决快速算法，编码速度可以提高58.4%，满足实时视频通信的要求．

Decision of all-zero blocks before integer transform and quantization in H. 264

We present a fast algorithm for reducing computation complexity of the encoding inter frame in H. 264. In the method, whether all coefficients of a block in transforming domain are zero is examined before integer transform and quantization. Using the above judgment of all-zero blocks, the computation of selecting the inter prediction mode is greatly reduced. Simulation results show that inter macroblock encoding of H. 264 is obviously speeded up by the proposed method. Furthermore, this algorithm is compatible with the H. 264 standard, and can be used in practice.