Compressed/reconstructed test images for CRAF/Cassini

Details Compressed/reconstructed test images for CRAF/Cassini Compressed/reconstructed test images for CRAF/Cassini

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991tdapr.104...88d&link_type=abstract

In its The Telecommunications and Data Acquisition Report p 88-97 (SEE N91-18308 10-32)

Mathematics

Algorithms, Data Compression, Error Analysis, Gray Scale, Image Processing, Image Reconstruction, Cassini Mission, Comet Rendezvous Asteroid Flyby Mission, Compression Ratio, Entropy, Mean Square Values, Root-Mean-Square Errors, Transformations (Mathematics)

Scientific paper

A set of compressed, then reconstructed, test images submitted to the Comet Rendezvous Asteroid Flyby (CRAF)/Cassini project is presented as part of its evaluation of near lossless high compression algorithms for representing image data. A total of seven test image files were provided by the project. The seven test images were compressed, then reconstructed with high quality (root mean square error of approximately one or two gray levels on an 8 bit gray scale), using discrete cosine transforms or Hadamard transforms and efficient entropy coders. The resulting compression ratios varied from about 2:1 to about 10:1, depending on the activity or randomness in the source image. This was accomplished without any special effort to optimize the quantizer or to introduce special postprocessing to filter the reconstruction errors. A more complete set of measurements, showing the relative performance of the compression algorithms over a wide range of compression ratios and reconstruction errors, shows that additional compression is possible at a small sacrifice in fidelity.

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