论文部分内容阅读
为了降低计算复杂度和编码时间,提出了一种改进的H.264/AVC全零块提早判决方法.首先,介绍了已有的全零块判决算法,分析了3种变换后将量化为零的频域系数,并在3种不同频域伸缩因子的基础上推导出对应的空域系数.然后,根据这些空域系数,并应用Schwarz不等式原理,设定了3个全零块判决阈值,并根据全零块空域系数的分布情况设定另一个阈值.最后,结合前3个阈值的最小值和后一阈值,提出一种比目前全零块判决算法更为精确的方法.仿真结果表明,所提方法比目前的全零块判决方法提高了5%的全零块判决率,并节省了4%～10%的编码时间,同时仅有0.1dB的视频质量的降低.
In order to reduce the computational complexity and coding time, an improved H.264 / AVC all-null early-decision method is proposed.Firstly, the existing all-zero decision algorithm is introduced and the quantized zero The corresponding spatial coefficients are deduced on the basis of the three different frequency-domain scaling factors. Then, based on these spatial coefficients and applying the Schwarz inequality principle, three all-zero decision thresholds are set, and according to And the distribution of all-null airspace coefficients sets another threshold.Finally, combining with the minimum of the first three thresholds and the latter threshold, a more accurate method than the current all-zero decision algorithm is proposed.The simulation results show that Compared with the current all-null decision method, the proposed method improves the all-zero decision rate of 5% and saves coding time of 4% -10% while reducing the video quality of only 0.1dB.