3 October 1998 Selection of the SPOT5 image compression algorithm
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Abstract
Improving the ground resolution of SPOT 5 compared with SPOT 4 involves multiplying the data rate by 4. This made it necessary to seek a new image compression algorithm able to significantly increase the compression ratio while complying with the image quality requirements of SPOT users. We finally selected a DCT based algorithm embedded in a regulation loop in order to obtain a constant rate at the compressor output. This algorithm was first tested using simulated images. Quantitative and qualitative analyses were carried out at different development stages. Finally, a wide range of images chosen from the SPOT image database was used for validation purpose. This led us to propose several optimizations which have now been thoroughly tested. The result is an almost lossless compression algorithm, which will be used on both SPOT5 and HELIOS II, the French space agency's forthcoming Earth observation missions.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Philippe Lier, Gilles A. Moury, Christophe Latry, Francois Cabot, "Selection of the SPOT5 image compression algorithm", Proc. SPIE 3439, Earth Observing Systems III, (3 October 1998); doi: 10.1117/12.325660; https://doi.org/10.1117/12.325660
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KEYWORDS
Image compression

Image quality

Quantization

Image processing

Algorithm development

Chromium

Signal to noise ratio

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