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Re: Drizzling Algorithms
| Re: Drizzling Algorithms [message #36559 is a reply to message #36558] |
Fri, 26 September 2003 08:26  |
Wayne Landsman
Messages: 117
Registered: January 1997
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Senior Member |
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> The second article is another dazzling one anchored
> by JD about "drizzling" algorithms. No, we are not talking
> about chocolate sprinkles on ice-cream sundaes. Drizzling
> algorithms are used in the reconstruction or warping of
> images from undersampled or dithered data. (I don't know,
> you'll have to read the article!) It's another can't miss
> hit for you Histogram fans.
>
> http://www.dfanning.com/code_tips/drizzling.html
>
Well, we are all thankful for David's late night inspirations (or sleep
difficulties), and I feel very curmudgeonly to have to bring up a
caveat. But the above article might lead people to think that there are
drizzle or other flux-conserving algorithms available in IDL, and I am
not aware that there are any. David's article is really about array
decimation, which would be just one step in writing a vectorized drizzle
code (as described in
http://www-int.stsci.edu/~fruchter/dither/drizzle.html )
My own attempts at writing a vectorized drizzle code floundered on
determining partial pixel weights.
I'm pretty sure now that drizzle code is best written in C and linked to
IDL. Or perhaps I need to try out the V6.0 IDL-Java bridge with Tom
McGlynn's software at http://skyview.gsfc.nasa.gov/polysamp/PolySamp.java
Wayne landsman@sampa.gsfc.nasa.gov
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