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Description

"Hcompress STScI Digitized Sky Survey that was used to compress."
indir.biz Editor: Richard L. Hcompress image compression package White Space Telescope Science Institute is written for. STScI Digitized Sky Survey and the Hcompress to compress the Hubble Data Archive was used to compress the preview image was used. In short, the method is used:


wavelet-called H-transform (a Haar generalized to two dimensions) followed by transformation
assigns the signal to noise in the image quantization All retaining scales, followed
quadtree coding quantized coefficients.
technical and fast, compression or decompression of the 512x512 image requires about 1 second for a very good compression allows for astronomical images Sun SPARCStation 2 Using integer arithmetic calculations which are carried out and fully recyclable. As a result, the program either lossy or lossless compression, a custom approach for lossless case can be used (there is now no need of such a file.) Documentation programs and the use of compression method is found in the doc subdirectory.
These programs (including FITS a small variety of input formats, astronomical images, the most widely used format.) Is the compressed image file format is machine-independent and 2-byte integer in the image can be compressed with binary FTP can be transferred between computers. The source code is reasonably machine independent, even if a wide range of machines has not been tested. Unix and VMS (VAX) machines for the installation instructions in the README files are given in the appropriate sub. Much any other kind of machine that attempts to download code will be interested to hear (eg MS-DOS, Mac.) Now can download free Hcompress 1.0.

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