Proportional feedback based rate control for intra frame of H.264/AVC high profile

This paper focuses on the intra frame rate control of H.264/AVC High Profile and introduces a new frame gradient-based rate control algorithm. In this algorithm, a rate-gradient-quantization parameter model with frame gradient employed as frame complexity is proposed. Then, a proportional feedback scheme, along with an adaptive optimization method, is presented to achieve constant bitrate. Rigorous experiments covering various sequences of different target rates are carried out. Experimental results show that the proposed rate control method outperforms JM16.0 by offering a more constant rate output and reducing rate fluctuation, without video quality loss.