Technical Program

Paper Detail

Session:Video Coding
Time:Tuesday, May 18, 13:00 - 15:00
Presentation: Poster
Topic: Image and Multidimensional Signal Processing: Image and Video Coding
Authors: Nejat Kamaci; Georgia Institute of Technology 
 Yücel Altunbaşak; Georgia Institute of Technology 
Abstract: Most real-time MPEG-like encoders are designed to perform in a constant bit rate (CBR) mode, in which large deviations from a target rate are avoided at any time instant because of video buffer regulations set at the decoder. A rate-control method at the encoder ensures that by intelligent selection of encoding parameters, the video buffer constraints are met, while at the same time a best possible video quality is achieved. Almost all reported rate-control methods model the rate and distortion in terms of the quantization step size. A recently suggested alternative is to use ρ, the fraction of zeros among the quantized DCT coefficients. In this paper, we address the problems associated with the ρ-domain rate-control approaches in the literature. In addition, we propose a robust MPEG-2 rate-control algorithm that aims to minimize picture quality variations. Our extensive analysis with several video sequences and using MPEG-2 codec indicates that the proposed algorithm can achieve a more uniform visual quality, and provides a PSNR gain that ranges from 0.5 dB at 2 Mbps to 0.9 dB at 6 Mbs over TM5 on the average.

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