Quantization Parameter Refinement in H.264 through ρ-Domain Rate Model

Yutao DONG  Xiangzhong FANG  Jing YANG  

IEICE TRANSACTIONS on Information and Systems   Vol.E91-D   No.6   pp.1834-1837
Publication Date: 2008/06/01
Online ISSN: 1745-1361
DOI: 10.1093/ietisy/e91-d.6.1834
Print ISSN: 0916-8532
Type of Manuscript: LETTER
Category: Speech and Hearing
H.264,  rate control,  ρ-domain,  quantization parameter refinement,  

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This letter proposes a new algorithm of refining the quantization parameter in H.264 real-time encoding. In the H.264 encoding, the quantization parameter computed according to the quadratic rate model is not accurate in meeting the target bit rate. In order to make the actual encoded bit rate closer to the target bit rate, ρ-domain rate model is introduced in our proposed quantization parameter refinement algorithm. Simulation results show that the proposed algorithm achieves obvious gain in PSNR and has stabler encoded bit rate compared to Jiang's algorithm.