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Optical Engineering

Hybrid adaptive block truncation coding for image compression
Author(s): Ching-Yung Yang; Ja-Chen Lin
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Paper Abstract

A hybrid adaptive block truncation coding (HABTC) method is presented to improve block truncation coding (BTC)-related compression methods for gray-level images. The basic idea behind the method is to use various coding schemes to take advantage of local image characteristics. A simple linear interpolation coding scheme and a very basic predictive coding scheme are used to improve the compression ratio of the homogeneous area of the image. Moreover, a four-level BTC, whose thresholds are obtained using a radius-weighted mean (RWM), is applied to encode the inhomogeneous area. The bits per pixel/peak SNR (bpp/PSNR) values listed in many other BTC-related papers are cited and compared with ours. It is found that reasonable compression ratio is obtained by the proposed HABTC method and the visual quality of the decoded images is also acceptable.

Paper Details

Date Published: 1 April 1997
PDF: 7 pages
Opt. Eng. 36(4) doi: 10.1117/1.601288
Published in: Optical Engineering Volume 36, Issue 4
Show Author Affiliations
Ching-Yung Yang, National Chiao Tung Univ. (Taiwan)
Ja-Chen Lin, National Chiao Tung Univ. (Taiwan)

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