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994 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, VOL. 15, NO. 8, AUGUST 2005 Frame Bit Allocation for the H.264/AVC
 

Summary: 994 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, VOL. 15, NO. 8, AUGUST 2005
Frame Bit Allocation for the H.264/AVC
Video Coder Via Cauchy-Density-Based
Rate and Distortion Models
Nejat Kamaci, Student Member, IEEE, Yucel Altunbasak, Senior Member, IEEE, and
Russell M. Mersereau, Fellow, IEEE
Abstract--Based on the observation that a Cauchy density is
more accurate in estimating the distribution of the ac coeffi-
cients than the traditional Laplacian density, rate and distortion
models with improved accuracy are developed. The entropy
and distortion models for quantized discrete cosine transform
coefficients are justified in a frame bit-allocation application for
H.264. Extensive analysis with carefully selected anchor video
sequences demonstrates a 0.24-dB average peak signal-to-noise
ratio (PSNR) improvement over the JM 8.4 rate control algorithm,
and a 0.33-dB average PSNR improvement over the TM5-based
bit-allocation algorithm that has recently been proposed for
H.264 by Li et al. The analysis also demonstrates 20% and 60%
reductions in PSNR variation among the encoded pictures when
compared to the JM 8.4 rate control algorithm and the TM5-based

  

Source: Altunbasak, Yucel - School of Electrical and Computer Engineering, Georgia Institute of Technology

 

Collections: Engineering