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Re: Faster image median filtering [message #76753 is a reply to message #76662]

Fri, 24 June 2011 15:33

wlandsman
Messages: 743
Registered: June 2000

Senior Member

I think suspect that the IDL implementation of MEDIAN is reasonably optimal (e.g. using a rolling window). In the ancient days of IDL, MEDIAN() only worked on byte data, and I used to use a CALL_EXTERNAL to a C program for float data. But when support for floating data in MEDIAN was added, it was definitely faster than my CALL_EXTERNAL setup.

Having said that you might look at scaling your data to byte. The MEDIAN() is the midpoint of ordered data , and the order should be maintained after byte scaling (except that resolution is lost, so some nonequal values become equal). And MEDIAN is *much* faster on byte data.

--Wayne

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[Message index]

		Faster image median filtering By: Deckard++; on Fri, 24 June 2011 06:48
		Re: Faster image median filtering By: Juggernaut on Tue, 28 June 2011 10:33
		Re: Faster image median filtering By: Deckard++; on Sun, 03 July 2011 06:53
		Re: Faster image median filtering By: wlandsman on Fri, 24 June 2011 15:33
		Re: Faster image median filtering By: Deckard++; on Sun, 03 July 2011 06:54

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