关键词: H.264, 码率控制, 场景切换, 复杂程度, 目标码率

Abstract: A new rate control algorithm based on scene change was proposed on the basis of H.264 frame-layer. The complexity of image was measured by the weighted sum of the ratio of Mean Absolute Difference (MAD) of P-frame luma coeffecient and the relative changes of YUV's mean value, then the target rate was allocated and the quantitative parameters were adjusted according to the complexity. Meanwhile the target rate can be adjusted by using bits compensative factor. Compared to the algorithm in JVT-G012, the experimental results under the JM10.2 show that both the accuracy of rate controlling and the quality of reconstructed images can be improved if using the algorithm.

Key words: H.264, rate control, scene change, complexity, target rate