Subband coding of images using vector quantization

Author

Westerink, Peter H. ; Boekee, Dick E. ; Biemond, Jan ; Woods, John W.

Author_Institution

Dept. of Electr. Eng., Delft Univ. of Technol., Netherlands

Volume

36

Issue

6

fYear

1988

fDate

6/1/1988 12:00:00 AM

Firstpage

713

Lastpage

719

Abstract

A novel two-dimensional subband coding technique is presented that can be applied to images as well as speech. A frequency-band decomposition of the image is carried out by means of 2D separable quadrature mirror filters, which split the image spectrum into 16 equal-rate subbands. These 16 parallel subband signals are regarded as a 16-dimensional vector source and coded as such using vector quantization. In the asymptotic case of high bit rates, a theoretical analysis yields that a lower bound to the gain is attainable by choosing this approach over scalar quantization of each subband with an optimal bit allocation. It is shown that vector quantization in this scheme has several advantages over coding the subbands separately. Experimental results are given, and it is shown the scheme has a performance that is comparable to that of more complex coding techniques

Keywords

encoding; filtering and prediction theory; filters; picture processing; vectors; 2D separable quadrature mirror filters; frequency-band decomposition; image coding; image spectrum; subband signals; theoretical analysis; two-dimensional subband coding technique; vector quantization; vector source; Bit rate; Filtering; Filters; Frequency; Image coding; Information theory; Multi-stage noise shaping; Multidimensional systems; Speech coding; Vector quantization;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.2791

Filename

2791