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CONVOL : no subscripting with POLYFILLV? [message #14108] Fri, 22 January 1999 00:00 Go to previous message
Tom Wassenaar is currently offline  Tom Wassenaar
Messages: 15
Registered: August 1998
Junior Member
I'd like to use polygon vertices directly to determine the image subset
to convolve, but is it right that CONVOL only operates on simple square
subscripts ?

a simple example :
ENVI> a = findgen(10, 20)
ENVI> kernel = fltarr(3, 3) + 1
ENVI> b = convol(a[2:8, 4:15], kernel, total(kernel))
; this works fine !
ENVI> x = POLYFILLV([2,2,8,8], [4,15,15,4], 10, 20)
ENVI> b = convol(a[x], kernel, total(kernel))
% CONVOL: Kernel's dimensions are incompatible with operand's.

WHY ?
--

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Tom Wassenaar
INRA Science du Sol, 2 place Pierre Viala
34060 Montpellier Cedex 02, tel. +33 (0)499612764
M�l : wassenaar@ensam.inra.fr
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