基于Sobel边缘算子的H.264/AVC码率控制方案

Rate Control Scheme for H.264/AVC Based on Sobel Edge Operator

提出了一种基于Sobel边缘算子的宏块层H.264码率控制方案.该方案利用Sobel边缘算子,提高了平均绝对误差预测准确性和头信息比特预测准确性,继而在Sobel边缘算子计算结果的基础上采用一种新的历史数据点选择方法,进一步提升了码率-量化模型的准确性.实验表明,与传统的H.264/AVC码率控制算法相比,该方案能更精确地控制码率并获得最大0.8 dB的峰值信噪比增益.

An accurate macroblock （MB） layer rate control scheme based on Sobel edge operator for H. 264/AVC is proposed. Utilizing the Sobel edge operator, the prediction accuracy of both mean absolute difference （MAD） and header bits can be improved. Meanwhile, a more suitable Rate Quantization （R-Q） model history data point selection method is also developed to enhance the accuracy of R-Q model. Extensive simulations show that the scheme can control bit rates accurately with the average peak signal-to-noise ratio （PSNR） up to 0.8dB when compared with the conventional H. 264/AVC rate control algorithms.