Improved Methods for Initializing R-Q Model Parameters and Quantization Parameter in H.264 Rate Control
Computer Science and Information Engineering, World Congress on (2009)
Los Angeles, California USA
Mar. 31, 2009 to Apr. 2, 2009
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/CSIE.2009.243
Rate control plays an important role in video coding and transmission. Current initialization of Quantization Parameter (QP) in H.264 rate control takes the same value for images with different complexity as long as the bit number per pixel is the same which is different from the real-world situation. In this paper, we propose a new R-Q model and QP initializing method to improve the precision of rate control. In this method, the quantization parameter and R-Q model parameters are calculated from the first two frames of video sequence. Some formulas are presented to implement the process in this paper. Experimental results show that the output bit rate achieved by our proposed one is more close to the target bit rate while the reconstructed quality is comparable with low computing complexity.
X. Liu, Q. Dai and C. Fu, "Improved Methods for Initializing R-Q Model Parameters and Quantization Parameter in H.264 Rate Control," 2009 WRI World Congress on Computer Science and Information Engineering, CSIE(CSIE), Los Angeles, CA, 2009, pp. 320-323.