一种基于残差系数的快速编码算法

当前视频编码标准有着较高的编码效率，然而也较多地提高了编码复杂度，因此提高编码速度具有很重要的意义。根据残差系数的分布特征，该文提出了一种基于残差的快速编码算法。该算法首先根据Inter1616或者Inter88编码得到的残差系数进行假设检验，根据假设检验的结果来预测可能的编码模式集合；然后根据DCT系数的分布特征分别计算出全零块，11子块，22子块和33子块的判决条件，从而避免44子块中全部或者部分系数的DCT，Q，IQ，IDCT运算。实验证明，该文算法的编码速度要显著快于其它算法，同时编码效率的损失也很小。

A Fast Encoding Algorithm Based on Residual Coefficients

The current video coding standards have higher coding efficiency, but also increase the coding complexity. Thus improving the encoding speed is very important. According to the distribution of the residual coefficients, a fast encoding algorithm is proposed. The algorithm first uses residual coefficients which are obtained from the Inter16×16 or Inter8×8 for the hypothesis testing. Then the results of the hypothesis testing are used to predict the possible coding mode. And the criteria for all-zero blocks, 1 × 1 sub-blocks, 2 × 2 sub-blocks and 3 ×3 sub-blocks are calculated based on the distribution of the DCT coefficients, thus avoiding all or some of the operation on the coefficients of DCT, Q, IQ, IDCT in the 4 × 4 sub-blocks. The experimental results show that the encoding speed of the proposed algorithm is significantly faster than other algorithms with negligible coding loss.