Rounded reduced-difference pyramid for semilossy image coding

Luciano Alparone; Paolo Capperi; Bruno Aiazzi; Stefano Baronti; Giuliano Benelli

doi:10.1117/12.212976

1 November 1995 Rounded reduced-difference pyramid for semilossy image coding

Luciano Alparone; Paolo Capperi; Bruno Aiazzi; Stefano Baronti; Giuliano Benelli;

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Optical Engineering, 34(11), (1995). doi:10.1117/12.212976

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.

Citation Download Citation

Luciano Alparone, Paolo Capperi, Bruno Aiazzi, Stefano Baronti, Giuliano Benelli, "Rounded reduced-difference pyramid for semilossy image coding," Optical Engineering 34(11), (1 November 1995). https://doi.org/10.1117/12.212976

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