Τίτλος:
Quantitative perceptual comparison of variable bit rate over constant bit rate encoding scheme for MPEG-4 video
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
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%. © 2007 SPIE and IS&T.
Συγγραφείς:
Koumaras, H.
Gardikis, G.
Kourtis, A.
Martakos, D.
Περιοδικό:
Journal of Electronic Imaging
Λέξεις-κλειδιά:
Digital video coding; Quantitative perceptual; Variable bit rate (VBR), Approximation theory; Image coding; Image quality; Parameter estimation; Video recording, Motion Picture Experts Group standards
