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Re: New Image Processing Routines [message #47699 is a reply to message #47698]

Thu, 23 February 2006 19:37

jdsmith
Messages: 2
Registered: April 2003

Junior Member

Looks good, David. If you really want to impress astronomers, you might
add a few range compression methods:

1. histogram equalization (done well, is rare).
2. The ASINCH scaling, which is linear at the low end, and logarithmic
at the high end (which is about perfect for showing noise properties and
high contrast features all at once). Robert Lupton wrote such a beast
in IDL already:

http://cheops1.uchicago.edu/idlhelp/sdssidl/plotting/tvasinh .html

His website links to a little paper describing the method (which has
some very nice properties, but occasionally produces strange-looking
images:

http://www.astro.princeton.edu/~rhl/PrettyPictures/

The trick will be coming up with an easier way to set the 2 parameters
required that affect the scaling.

JD

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[Message index]

		Re: New Image Processing Routines By: David Fanning on Fri, 24 February 2006 13:08
		Re: New Image Processing Routines By: David Fanning on Fri, 24 February 2006 08:07
		Re: New Image Processing Routines By: David Fanning on Thu, 23 February 2006 21:48
		Re: New Image Processing Routines By: jdsmith on Thu, 23 February 2006 19:37
		Re: New Image Processing Routines By: Paolo Grigis on Mon, 06 March 2006 02:20
		Re: New Image Processing Routines By: George N. White III on Sun, 05 March 2006 11:35
		Re: New Image Processing Routines By: Marshall Perrin on Fri, 21 April 2006 05:02

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