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Maximum value array resampling [message #45027]

Fri, 05 August 2005 10:55

davis anderton
Messages: 4
Registered: May 2001

Junior Member

I'm trying to figure out an IDL-efficient way to resample a series of
images. I know how to do this is a ruinously laborious fashion using
loops but I know there's any easier way.

Consider the following 4x4 array:

x = [$
[0,3,4,5],$
[1,2,7,0],$
[3,2,9,0],$
[7,0,5,6]]

I want to resample this to y, a 2x2 array. Each element would contain
the maximum value of the corresponding 4 pixels. y would then look like

[$
[3,7],$
[7,9]]

So element [0,0] in y is max(x[0:1,0:1]) etc. As I understand it,
rebin/congrid won't do this. Each image is about 5000x2000 and there
are several hundred to process.

Thanks!

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