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Search and Replace in 2D Array (Image) [message #66656]

Thu, 28 May 2009 12:24

vikramivatury
Messages: 24
Registered: May 2009

Junior Member

Hello,

I have an image "m" which is [1229 x 1229] pixels that contains 1's
and 0's. I also have an image "img" which is [1229 x 1229] that
contains pixel IDs. For every 1 in image "m" it corresponds to a
certain pixel ID in image "img". I am trying to write a loop in IDL
that scans through the pixels of image "m" and when its get to a 1,
spit out its information from "img". I used the 'where' function (w =
where m gt 1.........ids = img(w)) and that worked fine in outputting
a 1D array of 1510441 pixels, but I am trying to do it for a 2D array
using loops.

img = read_tiff('NP.tif')
ids = fltarr(1229,1229)

for i = 0,1228 do begin
for j = 0,1228 do begin
if (m(i,j) eq 1.) then begin
ids(i,j) = img(m(i,j))
endif
endfor
endfor

Any suggestions would be great.

Thanks,
Vikram

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