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Proceedings Paper

Lossy compression of MERIS superspectral images with exogenous quasi optimal coding transforms
Author(s): Isidore Paul Akam Bita; Michel Barret; Florio Dalla Vedova; Jean-Louis Gutzwiller
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Paper Abstract

Our research focuses on reducing complexity of hyperspectral image codecs based on transform and/or subband coding, so they can be on-board a satellite. It is well-known that the Karhunen-Loève Transform (KLT) can be sub-optimal in transform coding for non Gaussian data. However, it is generally recommended as the best calculable linear coding transform in practice. Now, the concept and the computation of optimal coding transforms (OCT), under low restrictive hypotheses at high bit-rates, were carried out and adapted to a compression scheme compatible with both the JPEG2000 Part2 standard and the CCSDS recommendations for on-board satellite image compression, leading to the concept and computation of Optimal Spectral Transforms (OST). These linear transforms are optimal for reducing spectral redundancies of multi- or hyper-spectral images, when the spatial redundancies are reduced with a fixed 2-D Discrete Wavelet Transform (DWT). The problem of OST is their heavy computational cost. In this paper we present the performances in coding of a quasi optimal spectral transform, called exogenous OrthOST, obtained by learning an orthogonal OST on a sample of superspectral images from the spectrometer MERIS. The performances are presented in terms of bit-rate versus distortion for four various distortions and compared to the ones of the KLT. We observe good performances of the exogenous OrthOST, as it was the case on Hyperion hyper-spectral images in previous works.

Paper Details

Date Published: 31 August 2009
PDF: 9 pages
Proc. SPIE 7455, Satellite Data Compression, Communication, and Processing V, 74550U (31 August 2009); doi: 10.1117/12.830488
Show Author Affiliations
Isidore Paul Akam Bita, LUXSPACE Sarl (Luxembourg)
Michel Barret, SUPELEC (France)
Florio Dalla Vedova, LUXSPACE Sarl (Luxembourg)
Jean-Louis Gutzwiller, SUPELEC (France)

Published in SPIE Proceedings Vol. 7455:
Satellite Data Compression, Communication, and Processing V
Bormin Huang; Antonio J. Plaza; Raffaele Vitulli, Editor(s)

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