Hybrid adaptive block truncation coding for image compression

Ching-Yung Yang; Ja-Chen Lin

doi:10.1117/1.601288

1 April 1997 Hybrid adaptive block truncation coding for image compression

Ching-Yung Yang, Ja-Chen Lin

Optical Engineering, Vol. 36, Issue 4, (April 1997). https://doi.org/10.1117/1.601288

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.

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Ching-Yung Yang and Ja-Chen Lin "Hybrid adaptive block truncation coding for image compression," Optical Engineering 36(4), (1 April 1997). https://doi.org/10.1117/1.601288

Published: 1 April 1997

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