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Re: Can i avoid the loop,help me speed up,thanks [message #61890 is a reply to message #61889]

Mon, 04 August 2008 13:44

ben.bighair
Messages: 221
Registered: April 2007

Senior Member

On Aug 4, 9:29 am, Rongchang Chen <chenrc1...@gmail.com> wrote:
> I wrote a procedure to create sinograms from projections in
> tomography,the main part of procedure please see below.
> For large size and number projections,it's very very slow.
> Can i avoid the loop(one is OK) to speed up,or another way to create
> sinograms?
> Thank you very much!!
>
> ************
> n_sinogra:number of sinogram
> n_projection:number of projection
> files_projection:a string vector contain Directory and name of
> projection
> files_sino:a string vector contain Directory and name of sinogram
>
> for jj = 0,n_sinogram-1 do begin
> print,'now creating',jj+1,'th sinogram'
> sino = fltarr(sizepro[0],n_projection)
>
> for ii=0, n_projection-1 do begin
> image = float(read_image(files_projection[ii]))
> some processing of image
> sino(*,ii) = image(*,jj)
> endfor
>
> write_tiff,files_sino(jj),sino,/short,/float
> endfor
> *****************

Hi,

I don't think it is possible for anyone to penetrate where you are
having trouble with the given information. I think you might try
using the builtin PROFILER routine for a start. It should reveal to
you where you are spending most of your time.

Unrelated to the speed issue, you seem to be specifying TIFF output
simultaneously as a SHORT integer and a FLOAT. What type of image do
you want to be saving?

Cheers,
Ben

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[Message index]

		Re: Can i avoid the loop,help me speed up,thanks By: Jeremy Bailin on Tue, 05 August 2008 04:48
		Re: Can i avoid the loop,help me speed up,thanks By: Chris[6] on Mon, 04 August 2008 18:35
		Re: Can i avoid the loop,help me speed up,thanks By: Vince Hradil on Mon, 04 August 2008 14:31
		Re: Can i avoid the loop,help me speed up,thanks By: ben.bighair on Mon, 04 August 2008 13:44
		Re: Can i avoid the loop,help me speed up,thanks By: Rongchang Chen on Mon, 11 August 2008 07:56

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