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Re: count number of pixels and write to a txt file [message #90145 is a reply to message #90144]

Sun, 01 February 2015 23:43

Moritz Fischer
Messages: 32
Registered: June 2013

Member

Am 02.02.2015 um 07:38 schrieb beardown912@gmail.com:
> Hello,
>
> I've been banged my head and pulling out my hairs for last a couple
> of days, but I am still struggling. And I decided to get some help
> from you guys.
>
> What I've been trying to is counting number of pixels meets a
> condition and write it into a text file with the file name. And I am
> dealing with about 20,000 image files. I used 'where' function and it
> works fine in displaying while looping. However, only the last value
> of pixel number and all file names are appended. Below is what I've
> been reached. It looks very sloppy :)
>
> ------------------------------ pro filelist
>
> filter = ['*.tif'] file = file_search(dialog_pickfile(PATH='C:\',
> filter=filter, get_path=outdir, /multiple_files), count=numbers)
> FILE_MKDIR, outdir
>
> FOR j=0, numbers-1 DO BEGIN
>
> Image = read_tiff(file[j])
>
> index = where(image ge 210, ct)
>
> if ct GT 50000 then begin openw, lun, outdir + 'test00.txt ',
> /get_lun printf, lun, ct, file close, lun free_lun, lun endif
>
> ENDFOR end ------------------------------------------------
>
> Any tip would be greatly appreciated.
>
> Thanks, Kim
>

Hi!
You are re-opening (and thus overwriting) the file. You could
a) add "/APPEND" to the openw command
b) pull the openw/close/free_lun out of the loop.
Solution b) is faster, but considering the WHERE command it probably
doesn't matter in this case.
I also think you can ommit either the free_lun or the close command, but
I'm not sure at the moment.
m

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[Message index]

		count number of pixels and write to a txt file By: beardown912 on Sun, 01 February 2015 22:38
		Re: count number of pixels and write to a txt file By: Moritz Fischer on Sun, 01 February 2015 23:43
		Re: count number of pixels and write to a txt file By: Yngvar Larsen on Mon, 02 February 2015 04:31
		Re: count number of pixels and write to a txt file By: beardown912 on Mon, 02 February 2015 05:18

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