| Paper: | IMDSP-P1.2 | ||
| Session: | Video Coding | ||
| Time: | Tuesday, May 18, 13:00 - 15:00 | ||
| Presentation: | Poster | ||
| Topic: | Image and Multidimensional Signal Processing: Image and Video Coding | ||
| Title: | rho-DOMAIN RATE-DISTORTION OPTIMAL RATE CONTROL FOR DCT-BASED VIDEO CODERS | ||
| 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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