H-Transform

A 2-D generalization of the Haar Transform which is used for the compression of astronomical images. The algorithmconsists of dividing the image into blocks of pixels, calling the pixels in the block ,, , and . For each block, compute the four coefficients

References

Capaccioli, M.; Held, E. V.; Lorenz, H.; Richter, G. M.; and Ziener, R. ``Application of an Adaptive Filtering Technique to Surface Photometry of Galaxies. I. The Method Tested on NGC 3379.'' Astron. Nachr. 309, 69-80, 1988.

Fritze, K.; Lange, M.; Möstle, G.; Oleak, H.; and Richter, G. M. ``A Scanning Microphotometer with an On-Line Data Reduction for Large Field Schmidt Plates.'' Astron. Nachr. 298, 189-196, 1977.

Richter, G. M. ``The Evaluation of Astronomical Photographs with the Automatic Area Photometer.'' Astron. Nachr. 299, 283-303, 1978.

White, R. L.; Postman, M.; and Lattanzi, M. G. ``Compression of the Guide Star Digitised Schmidt Plates.'' In Digitised Optical Sky Surveys: Proceedings of the Conference on ``Digitised Optical Sky Surveys'' held in Edinburgh, Scotland, 18-21 June 1991 (Ed. H. T. MacGillivray and E. B. Thompson). Dordrecht, Netherlands: Kluwer, pp. 167-175, 1992.

• Fuhrmann Circle
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