【摘要】 对现有的运动矢量编码算法作了改进.新算法根据图像在水平及垂直方向运动量的差异,将运动矢量的编码分为3种模式.对不同的编码模式采用不同的码表进行编码.仿真结果表明,新算法减少了10%~40%的运动矢量编码比特数,同时提高了重建图像质量达0.05~0.1dB.此外,新算法还提高了输出码流的抗误码性能和编码器流控的精确程度.更多还原

【Abstract】 Some modifications are made on the present algorithm for motion vector coding. In the new algorithm, motion vector coding is divided into three modes according to the difference between horizontal movement and vertical movement. For different coding modes, different variable length code （VLC） tables are used. The simulation results show that the new algorithm reduces 10%⁴0% bits for motion vector coding and improves the quality of reconstructed image by 0.05^0.1dB. In addition, the new method improves the robustness of video bit stream against channel errors and makes the rate controlling operation of video encoders more accurate.更多还原