The Quantization Parameter Adjustment Scheme Based on Prediction Mode of Coded Prediction Block

Rate control is an important part of video coding technology, which is used to control the encoder to output the code rate of a specific target and minimize the distortion of the coded video. Based on the rate control algorithm audio video coding standard 2.0 (AVS2), the fuzzy rate control has its limitations, and does not consider the correlation of video images. In this paper, an adjustment scheme of the quantization parameter (QP) is proposed. The QP of current encoding is adjusted according to the ratio of the inter-frame prediction block to the total coding block. First, when coding block division, to count the number and the pixels of the block using inter-frame prediction. Second, the final QP is adjusted according to the ratio of the statistical result to the total coding pixels. Finally, the newly obtained QP is substituted into the subsequent encoding process. The experimental results show that, under the common test condition, the new scheme can achieve significant Bjontegaard delta bit rate (BD-Rate) gain and it is not difficult to achieve.