A switched model-based coder for video signals

Author

Chowdhury, M.F. ; Clark, A.F. ; Downton, A.C. ; Morimatsu, E. ; Pearson, D.E.

Author_Institution

Dept. of Electron. Syst. Eng., Essex Univ., Colchester, UK

Volume

4

Issue

3

fYear

1994

fDate

6/1/1994 12:00:00 AM

Firstpage

216

Lastpage

227

Abstract

The algorithmic architecture and performance of a video coder are described that switches between the model-based and H.261 modes, depending on image content. The switching criterion incorporates measures of both picture quality and bit rate. The model-based mode uses generalized cylindrical models and a 3D matching technique to estimate motion. The coder was tested with four different image sequences in CBR and VBR operational modes: the performance was generally superior, and in some cases significantly superior, to that of a free-running H.261 coder operating on the same sequences. The switched architecture represents a possible route for the integration of model-based coding with H.261 to give improved performance at very low bit rates

Keywords

codecs; image coding; image sequences; motion estimation; parameter estimation; video equipment; video signals; 3D matching technique; CBR operational mode; H.261 mode; VBR operational mode; algorithmic architecture; bit rate; generalized cylindrical models; image content; image sequences; model-based coding; performance; picture quality; switched model-based coder; switching criterion; video signals; Bit rate; Discrete cosine transforms; Image coding; Image sequence analysis; Image sequences; Motion estimation; Object oriented modeling; Senior members; Switches; Testing;

fLanguage

English

Journal_Title

Circuits and Systems for Video Technology, IEEE Transactions on

Publisher

ieee

ISSN

1051-8215

Type

jour

DOI

10.1109/76.305867

Filename

305867