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在视频编码中使用基于零块判决的运动搜索算法已被公认为是一种能够加快编码速度的好方法,该算法的核心是确定一个恰当的零块判决阈值,从而使其在提高编码速度的同时不至于引起太多的图像质量下降和码率增加.在介绍H.264中的变换与量化运算的基础上,对H.264中零块判决阈值进行理论分析,得到了在H.264中可用的零块判决阈值范围,然后根据理论分析结果进行了相应的实验研究,通过对实验结果的分析,提出了在实际中可用的H.264中优化的零块判决阈值.
The use of zero-block decision-based motion search algorithm in video coding has been recognized as a good method to speed up the coding speed. The core of this algorithm is to determine an appropriate threshold value of zero block, so that it can improve the coding speed While not causing too much image quality degradation and code rate increase.With the introduction of H.264 transform and quantization based on the theoretical analysis of the zero block decision threshold H.264, obtained in H.264 The available zero-block decision threshold range, and then based on the theoretical analysis of the results of the corresponding experimental study, through the analysis of experimental results, put forward in practical H.264 sub-optimal threshold decision threshold.