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Re: Maximum value array resampling [message #45010 is a reply to message #45009]

Mon, 08 August 2005 11:20

JD Smith
Messages: 850
Registered: December 1999

Senior Member

By the way, since for processing many images of the same size you can
pre-compute the indices, you might consider a small change to the
modified loop method:

;; Pre-compute the indices:
d=size(x,/DIMENSIONS) & nx=d[0] & ny=d[1]
nx2=nx/2 & ny2=ny/2

inds1=rebin(lindgen(nx2)*2L,nx2,ny2,/SAMPLE)+ $
rebin(transpose(lindgen(ny2)*2L*nx),nx2,ny2,/SAMPLE)
inds2=inds1+1L
inds3=inds1+nx
inds4=inds1+nx+1L

;; Form the sub-sampled image (for each image)
xmax=x[inds1]>x[inds2]>x[inds3]>x[inds4]

This brings the total processing time per 5000x4000 image to under
0.5s on my not-so-fast Linux box (and doesn't have any loops ;).

JD

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[Message index]

		Re: Maximum value array resampling By: davis anderton on Mon, 08 August 2005 16:04
		Re: Maximum value array resampling By: JD Smith on Mon, 08 August 2005 11:20
		Re: Maximum value array resampling By: JD Smith on Mon, 08 August 2005 10:48
		Re: Maximum value array resampling By: Richard French on Fri, 05 August 2005 16:57
		Re: Maximum value array resampling By: JD Smith on Fri, 05 August 2005 16:09
		Re: Maximum value array resampling By: Richard French on Fri, 05 August 2005 14:50
		Re: Maximum value array resampling By: b_efremova@yahoo.com on Fri, 05 August 2005 14:06
		Re: Maximum value array resampling By: Richard French on Fri, 05 August 2005 13:45
		Re: Maximum value array resampling By: b_efremova@yahoo.com on Fri, 05 August 2005 13:34
		Re: Maximum value array resampling By: Richard French on Fri, 05 August 2005 13:17
		Re: Maximum value array resampling By: Richard French on Fri, 05 August 2005 12:59
		Re: Maximum value array resampling By: b_efremova@yahoo.com on Fri, 05 August 2005 12:18
		Re: Maximum value array resampling By: Richard French on Sat, 13 August 2005 18:05
		Re: Maximum value array resampling By: JD Smith on Mon, 15 August 2005 11:13

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