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coherence test implementation [message #15336]

Thu, 13 May 1999 00:00

Mark Rehbein
Messages: 8
Registered: January 1999

Junior Member

Hi,

I'm doing some cloud detection on some rather large images using what
some people call a coherence test. To do a coherence test on a pixel
you take a 3x3 matrix around that pixel and assign that pixel the
standard deviation of the 3x3 matrix. I have implemented this the
following way:

for y=1, lines-1 do begin
for x=1, pixels-1 do begin
matrix=ch4(x-1:x+1, y-1:y+1)
stats=moment(matrix, sdev=sdev)
sddevimage(x,y)=sdev
endfor
endfor

You might agree that the code above can be more efficient if I use array
and matrix operations. I'm fairly new to IDL and haven't been able to
successfully use array and matrix operations in this application.

I'd appreciate any help any of you could provide.

Please email mrehbein@aims.gov.au

Thanks

Mark

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[Message index]

		coherence test implementation By: Mark Rehbein on Thu, 13 May 1999 00:00
		Re: coherence test implementation By: Struan Gray on Thu, 13 May 1999 00:00
		Re: coherence test implementation By: eddie haskell on Thu, 13 May 1999 00:00
		Re: coherence test implementation By: Dick Jackson on Thu, 13 May 1999 00:00
		Re: coherence test implementation By: Craig Markwardt on Thu, 13 May 1999 00:00
		Re: coherence test implementation By: Dick Jackson on Thu, 13 May 1999 00:00

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