A finite state/frame difference interpolative vector quantizer for low rate image sequence coding

Author

Shen, Hsiao-hui ; Baker, Richard L.

Author_Institution

Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA

fYear

1988

fDate

11-14 Apr 1988

Firstpage

1188

Abstract

A finite-state vector quantizer (VQ) suitable for both intraframe and interframe coding is presented. Interblock and interframe memory is expressed through a state variable driven by an improved classifier which keys on the intensity gradients of a block´s neighbours and its own interframe motion. A bilinear interpolator reduces the energy of foreground residuals encoded by the quantization, improving edge rendition and limiting blocking artifacts. Background blocks are vector predictive coded using simple frame differencing and codebooks built with a gradient design algorithm. The codec at 0.4 bit/pixel outperforms a similar but non-finite-state intraframe VQ at 1.0 bit/pixel by 4 dB

Keywords

analogue-digital conversion; computerised picture processing; encoding; interpolation; bilinear interpolator; blocking artifacts; codebooks; codec; edge rendition; finite frame difference interpolative vector; finite-state vector quantizer; foreground residuals; gradient design algorithm; intensity gradients; interblock memory; interframe coding; interframe memory; intraframe coding; low rate image sequence coding; simple frame differencing; state variable; Algorithm design and analysis; Codecs; Digital integrated circuits; Image coding; Image resolution; Image sequences; Image storage; Laboratories; Pixel; Vector quantization;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1988. ICASSP-88., 1988 International Conference on

Conference_Location

New York, NY

ISSN

1520-6149

Type

conf

DOI

10.1109/ICASSP.1988.196811

Filename

196811