Lossy Compression of Astronomical Images

Details Lossy Compression of Astronomical Images Lossy Compression of Astronomical Images

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.552..829b&link_type=abstract

Proceedings of the 5th INTEGRAL Workshop on the INTEGRAL Universe (ESA SP-552). 16-20 February 2004, Munich, Germany. Scientific

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The paper deals with the discussion of the lossless and lossy compression of astronomical images. Because the lossless compression methods allow to reach the compression ratio according to properties of image data approx. 1.5 - 3 only, we tried to apply lossy methods, which allow to reach much higher compression ratio - up to 100 according to allowed loss. For successful application of lossy compression it is necessary to find the appropriate definition of acceptable loss. The lossy compression methods are usually used for the compression of normal, day to day images, where the acceptable loss is done by the visibility of image errors. For astronomical images it is necessary to find another criterion. We applied compression standard JPEG 2000 on astronomical images of star fields and changed the parameters of wavelet decomposition. For the evaluation of loss (quality of the compression) we use the difference in position and magnitude of stars in original and compressed images, calculated by programme IRAF.

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