A rate-distortion (R-D) optimization rate control (RC) algorithm with adaptive initialization is presented for H.264. First, a linear distortion-quantization (D-Q) model is introduced and thus a close-form solution is developed to derive optimal quantization parameters (Qp)for encoding each macroblock. Then we exploit to determine the initial Qp efficiently and adaptively according to the content of video sequences. The experimental results demonstrate that the proposed algorithm can achieve better R-D performance than that of other two RC algorithms including the algorithm JVT-G012 which is the current recommended RC scheme implemented in the H.264 reference software JM9.5. © 2006 IEEE.
|Journal||IEEE Transactions on Circuits and Systems for Video Technology|
|Publication status||Published - Jan 2008|
Bibliographical noteThis work was supported in part by City University of Hong Kong Strategic under Grant 7002023.
- Initial quantization parameter
- Rate control
- Rate-distortion optimization