Conference Paper

Efficient Rate Control for H.264 using RD-Cost

W&W Commun. Inc., Santa Clara
DOI: 10.1109/ICME.2007.4284674 Conference: Multimedia and Expo, 2007 IEEE International Conference on
Source: IEEE Xplore


A novel adaptive coding characteristic prediction scheme called RD-cost prediction model is proposed. Through this linear model and optimum bit allocation, RD-cost and texture bits budget of current basic unit can be obtained, and then the quantization parameter (QP) can be directly calculated. Simulation results show that the H.264 encoder, using the proposed algorithm, achieves a visual quality improvement up to 0.302 dB, meets better with target bit rates, produces more flat bit-rate curve and decreases more computation complexity than that using H.264 previous rate control method JVT-G012.

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    ABSTRACT: In this paper, we present a two-stage rate control scheme for H.264/AVC encoder. In frame-layer, a novel bit allocation method is introduced, which estimate the target frame bits based on the coding statistics of the first stage. In MB-layer, we adopt the rho-domain rate control scheme to get the refine QP of each MB for residual signal recoding. Experimental results show that our algorithm can efficiently smooth the visual quality fluctuation between frames, on the basis of meeting bit rate constraints accurately.
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