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Re: divise image envi-idl [message #70970 is a reply to message #70969]

Tue, 18 May 2010 09:15

jeanh
Messages: 79
Registered: November 2009

Member

Hi tonino_nestor

> I try to write a batch to divise my image but apparently, the values
> of the loop are wrong... could someone explain me what is wrong ?

what error do you get?

> envi_open_file, image, r_fid=fidimage, /NO_REALIZE
>
> if (fidimage eq -1) then begin
> print, 'error nestor'
> endif

at times, the r_fid can be an array... it works better to test if
(fidimage[0] eq -1)

> result = dblarr(NSimage/5, NLimage/2, NBimage)

result is of type double

> for i = 0, (NSimage-NSimage/5), NSimage/5 do begin
> for j = 0, (NLimage-NLimage/2), NLimage/2 do begin
>
> result = image[i:i+((NSimage/5)-1),j:j+((NLimage/2)-1),
> 0:NBimage-1]

result is of the type of image (float? double? int?)

> envi_write_envi_file, result, data_type=4
> outname = STRCOMPRESS('C:\Documents and Settings\Administrateur
> \Mesdocume\'+string(i/(NSimage/5))+string(j/(NLimage/2)),/RE MOVE_ALL)
> openw, lun, outname, /Get_lun
> close, lun
> free_lun, lun

here is your problem...
1) the output is of type float. So, if image is a double, your problem
is here!, change the data_type.
2) you need to specify more argument than that to envi_write_envi_file,
including the outname (if you don't want to have the output only in
memory), ns, nl, nb... see the help file.
3) you open and close the file... this is useless.
4) don't use STRCOMPRESS this way. The output would be, for the
begining: C:\DocumentsandSettings\ which is, I believe, not the
directory you are looking for. Instead, use strtrim ==>
+string(i/(NSimage/5)) becomes +strtrim(i/(NSimage/5),2)

Jean

> endfor
> endfor
>
> end

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[Message index]

		Re: divise image envi-idl By: tonino on Thu, 20 May 2010 14:03
		Re: divise image envi-idl By: tonino on Thu, 20 May 2010 13:22
		Re: divise image envi-idl By: jeanh on Wed, 19 May 2010 10:33
		Re: divise image envi-idl By: Antoine Cheula on Wed, 19 May 2010 07:17
		Re: divise image envi-idl By: jeffnettles4870 on Tue, 18 May 2010 12:22
		Re: divise image envi-idl By: jeanh on Tue, 18 May 2010 12:03
		Re: divise image envi-idl By: tonino on Tue, 18 May 2010 10:50
		Re: divise image envi-idl By: jeanh on Tue, 18 May 2010 09:15

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