Optimal variable quantization for JPEG extensions

Author

Hwang, J.J. ; Yang, K.H.

Author_Institution

Dept. of Telecommun., Kunsan Nat. Univ., South Korea

fYear

34851

fDate

7-9 Jun1995

Firstpage

266

Lastpage

267

Abstract

We present optimal variable quantization techniques for the newly proposed JPEG extensions from ISO/IEC 10918-3 (ITU-T Recommendation T.84). Variable quantization for each block is necessary to transcode from any video compression format (e.g. MPEG). It also gives increased subjective quality and efficient utilization of the channel bandwidth. The selective refinement extension is useful for selecting a part of an image for further refinement. In our experiments, we compare the reconstructed image obtained by variable quantization to that of the JPEG baseline system

Keywords

ISO standards; code standards; data compression; image reconstruction; quantisation (signal); telecommunication standards; video coding; ISO/IEC 10918-3; ITU-T Recommendation T.84; JPEG baseline system; JPEG extensions; MPEG; channel bandwidth; experiments; image reconstruction; optimal variable quantization; selective refinement extension; subjective quality; transcoding; video compression format; Application software; Bit rate; Computer science; Guidelines; IEC standards; ISO standards; Image coding; Quantization; Streaming media; Transform coding;

fLanguage

English

Publisher

ieee

Conference_Titel

Consumer Electronics, 1995., Proceedings of International Conference on

Conference_Location

Rosemont, IL

Print_ISBN

0-7803-2140-5

Type

conf

DOI

10.1109/ICCE.1995.517981

Filename

517981