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Optical Engineering

Rounded reduced-difference pyramid for semilossy image coding
Author(s): Luciano Alparone; Paolo Capperi; Bruno Aiazzi; Stefano Baronti; Giuliano Benelli
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Paper Abstract

An extension of the reduced-difference pyramid (RDP) algorithm is derived and proposed for lossy image compression with upperbounded maximum error (semilossy). Quantization has been introduced into the basic RDP in two different ways: approximations are made either before or after taking the differences among pairs of adjacent nodes. The resulting peak-error (PE) propagation along the pyramid is theoretically investigated, and quantization strategies are suggested. Tests on the standard gray-scale Lena image show significant and steady rate-distortion improvements over the original RDP. As few fixed-point operations are required per pixel, on-line compression/decompression is feasible on general-purpose computers.

Paper Details

Date Published: 1 November 1995
PDF: 7 pages
Opt. Eng. 34(11) doi: 10.1117/12.212976
Published in: Optical Engineering Volume 34, Issue 11
Show Author Affiliations
Luciano Alparone, Univ. di Firenze (Italy)
Paolo Capperi, Univ. of Florence (Italy)
Bruno Aiazzi, CNR (Italy)
Stefano Baronti, IROE-CNR (Italy)
Giuliano Benelli, Univ. di Siena (Italy)


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