关键词: 码率控制, 平均绝对差, 时空相关性, H.264, 平均绝对差变化趋势

Abstract: In the standard H.264 algorithm, only time relevance is used while predicting the Mean Absolute Difference (MAD). Therefore, an improved rate control algorithm of basic unit layer was introduced combining the time prediction and space prediction, while taking advantage of the change tendency of MAD. When compared with the standard rate control algorithm, adopted by the JVT H.264 reference software JM8.6, the proposed rate control algorithm can not only reduce the mismatch between actual bit rates and target ones, but also increase the average luminance Peak Signal-to-Noise (PSNR) of reconstructed video.

Key words: rate control, Mean Absolute Difference (MAD), spatio-temporal relevancy, H.264, change tendency of MAD