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Journal of Electronic Imaging

Quantitative perceptual comparison of variable bit rate over constant bit rate encoding scheme for MPEG-4 video
Author(s): Harilaos G. Koumaras; G. Gardikis; A. Kourtis; D. Martakos
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Paper Abstract

Between the two main schemes of digital video coding, the variable bit rate (VBR) encoding scheme is generally considered better in terms of efficiency and encoding quality in comparison to the constant bit rate (CBR), because it retains the same quantization parameters for the whole encoding procedure (unconstrained VBR), without altering them according to a specific adaptive rate algorithm. Toward this generally accepted statement, we present a quantitative comparison to the perceptual efficiency of the VBR over the CBR for the Moving Picture Expert Group-4 (MPEG-4) ASP CIF and QCIF encoding sequences, showing that the VBR does not outperform significantly the corresponding CBR encoding quality, since the deduced perceptual advantage/ratio of the VBR over the CBR for the CIF is approximately 4-5% and is constant for all the encoding bit rates greater than 200 kbps, while for the QCIF case the relative ratio drops to approximately 2.5%.

Paper Details

Date Published: 1 July 2007
PDF: 7 pages
J. Electron. Imag. 16(3) 033017 doi: 10.1117/1.2775465
Published in: Journal of Electronic Imaging Volume 16, Issue 3
Show Author Affiliations
Harilaos G. Koumaras, National Ctr. for Scientific Research (Greece)
G. Gardikis, National Ctr. for Scientific Research (Greece)
A. Kourtis, National Ctr. for Scientific Research (Greece)
D. Martakos, Univ. of Athens (Greece)

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