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Re: routine in ENVI to pass from EVF to ROI???? [message #49614 is a reply to message #49571]

Sun, 06 August 2006 23:45

txominhermos
Messages: 25
Registered: October 2005

Junior Member

Thanks for your reply David,
but I dont know how to use ARRAY_INDICES with an image load via
ENVI_OPEN_FILE. As you know the arguments requieres are Array and
Index, but I do not have the array in memory (because it is too big).

I have got the indices from:

FOR j=0,nb-1 DO BEGIN
roi_data = ENVI_GET_ROI_DATA( roi_id, fid=fid, pos = [j])
ENVI_GET_ROI_INFORMATION, roi_id, ns=ns, nl=nl
roi_addresses = ENVI_GET_ROI(roi_id) ; Get the
"position" of the pixels in the ROI
ENDFOR

So, the main problem -in this moment- is how to transform pixel
addresses into pixel coordinates with an image load via ENVI_OPEN_FILE
and without memory to store that image.

-txomin

David Streutker ha escrito:

> Once you have the vector of roi_addresses, you can use ARRAY_INDICES to
> convert the addresses to 2-dimensional coordinates. Then find the MIN
> and MAX of the x and y coordinates.
>
> If you have read the original file already, just use
> ENVI_WRITE_ENVI_FILE, Data[xMin:xMax,yMin:yMax] ...
>
> If you don't have enough memory to read in the original file, I *think*
> you can use MOSAIC_DOIT to clip the original. MOSAIC_DOIT is meant for
> use with multiple files, but I believe it will work with a single one,
> and you can use the x0 and y0 keywords to effectively subset the image.
>
> -David

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[Message index]

		routine in ENVI to pass from EVF to ROI???? By: txominhermos on Thu, 03 August 2006 00:20
		Re: routine in ENVI to pass from EVF to ROI???? By: David Streutker on Mon, 07 August 2006 08:43
		Re: routine in ENVI to pass from EVF to ROI???? By: txominhermos on Tue, 08 August 2006 01:56
		Re: routine in ENVI to pass from EVF to ROI???? By: txominhermos on Sun, 06 August 2006 23:45
		Re: routine in ENVI to pass from EVF to ROI???? By: David Streutker on Fri, 04 August 2006 08:50
		Re: routine in ENVI to pass from EVF to ROI???? By: txominhermos on Fri, 04 August 2006 02:37
		Re: routine in ENVI to pass from EVF to ROI???? By: txominhermos on Tue, 08 August 2006 02:15

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