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Quantitative perceptual comparison of variable bit rate over constant bit rate encoding scheme for MPEG-4 video

[+] Author Affiliations
Harilaos Koumaras

University of Athens, Informatics and Telecommunications Department, Panepistimioupoli, Zografou, Attiki, Athens, Greece

George Gardikis

Institute of Informatics and Telecommunications NCSR “DEMOKRITOS”, Patriarchou Gregoriou Street, Agia Paraskevi, Attiki, 15310, Athens, Greece

Anastasios Kourtis

Institute of Informatics and Telecommunications NCSR “DEMOKRITOS”, Patriarchou Gregoriou Street, Agia Paraskevi, Attiki, 15310, Athens, Greece

Drakoulis Martakos

University of Athens, Informatics and Telecommunications Department, Panepistimioupoli, Zografou, Attiki, Athens, Greece

J. Electron. Imaging. 16(3), 033017 (August 27, 2007). doi:10.1117/1.2775465
History: Received June 26, 2006; Revised March 13, 2007; Accepted March 14, 2007; Published August 27, 2007
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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 200kbps, while for the QCIF case the relative ratio drops to approximately 2.5%.

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© 2007 SPIE and IS&T

Citation

Harilaos Koumaras ; George Gardikis ; Anastasios Kourtis and Drakoulis Martakos
"Quantitative perceptual comparison of variable bit rate over constant bit rate encoding scheme for MPEG-4 video", J. Electron. Imaging. 16(3), 033017 (August 27, 2007). ; http://dx.doi.org/10.1117/1.2775465


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