Tiled Image Convention for Storing Compressed Images in FITS Binary Tables

Details Tiled Image Convention for Storing Compressed Images in FITS Binary Tables Tiled Image Convention for Storing Compressed Images in FITS Binary Tables

2012-01-06

arxiv.org/abs/1201.1336v1

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

Registered FITS Convention: http://fits.gsfc.nasa.gov/registry/tilecompression.html, v2.2, 4 May 2011, 17 pages

Scientific paper

This document describes a convention for compressing n-dimensional images and storing the resulting byte stream in a variable-length column in a FITS binary table. The FITS file structure outlined here is independent of the specific data compression algorithm that is used. The implementation details for 4 widely used compression algorithms are described here, but any other compression technique could also be supported by this convention. The general principle used in this convention is to first divide the n-dimensional image into a rectangular grid of subimages or 'tiles'. Each tile is then compressed as a block of data, and the resulting compressed byte stream is stored in a row of a variable length column in a FITS binary table. By dividing the image into tiles it is generally possible to extract and uncompress subsections of the image without having to uncompress the whole image.

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