Rho domain source modeling and rate control for video encoding and transmission

Zhihai He, Yong Kwan Kim, and Sanjit K. Mitra
Department of Electrical and Computer Engineering
University of California, Santa Barbara, CA 93106
{zhihai, ykkim, mitra} [at] iplab.ece.ucsb.edu


In this work, the coding bit rate R is considered as a function of Rho which is the percentage of zeros among the quantized DCT coefficients. We discover that the rate function R(Rho) has some very interesting properties in the rho-domain. By introducing the new concepts of characteristic rate curves and rate curve decomposition, a novel framework for source modeling is proposed. Using the proposed source model, we can estimate the rate-quantization (R-Q) curve before quantization and coding with relative error less than 5%. Based on the estimated R-Q curve, the output bit rate of the video encoder can be accurately controlled. Our extensive simulation results show that the proposed algorithm outperforms TMN8 1 and VM7 5 rate control algorithms by providing more accurate and robust rate control.
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Zhihai He, Yong Kwan Kim, and Sanjit K. Mitra,
ICASSP 2001, May. 2001.
Node ID: 322 , DB ID: 119 , Lab: IPL , Target: Conference
Subject: [IPL] « Look up more