A new quantizer selection scheme for digital VCR

Author

Rhee, Seunghyeon ; Kim, Yong Je ; Jeon, Jun Geun ; Song, Hong-Yeop ; Park, Kyu Tae

Volume

43

Issue

3

fYear

1997

fDate

8/1/1997 12:00:00 AM

Firstpage

879

Lastpage

885

Abstract

A consumer-use digital VCR selects a quantizer for each DCT block based on CLASS and QNO. CLASS is determined for each DCT block according to the characteristic of the block, for example, the maximum value of the AC coefficients. Six DCT blocks comprise a macroblock for which a QNO is determined. All of the quantizers defined in the specifications are numbered from 0 to 15 by QNO. Different quantizers can be referenced by the same QNO and are discriminated by CLASS. We propose a new method to determine these parameters, QNO and CLASS, for the selection of a quantizer per each DCT block. We first determine QNO for a macroblock and then fine-tune the quantizers by adjusting CLASS of each DCT block, For this we propose a modified quantizer map with a reduced set of quantizers, which preserves the compatibility with the conventional one. The results of our experiment show that our method outperforms the conventional method

Keywords

consumer electronics; digital magnetic recording; discrete cosine transforms; image classification; image segmentation; quantisation (signal); transform coding; video coding; video tape recorders; AC coefficients; CLASS; DCT block; QNO; consumer use digital VCR; digital image coding; experiment; image classification; image segmentation; macroblock; modified quantizer map; quantizer selection scheme; Code standards; Digital images; Discrete cosine transforms; Helium; Image coding; Image reconstruction; Image segmentation; Quantization; Streaming media; Video recording;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/30.628750

Filename

628750