关键词: 码率控制, 梯度, 场景变换

Abstract:

A new QP setting algorithm of I frame based on H.264 is proposed. The improved method establishes a rate-quantization(R-Q) model by using gradient-based picture complexity measure. Simulation shows that by using the proposed scheme, a better rate control accuracy and a higher PSNR gain will be achieved. When applied to scene change, the number of skipped frames will be significantly reduced and the overall subjective quality of the reconstructed video will be provided.

Key words: rate control, gradient, scene change