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Re: How to find the pixel position [message #70636 is a reply to message #70632]

Mon, 26 April 2010 23:26

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Apr 27, 1:16 am, sid <gunvicsi...@gmail.com> wrote:
> Hi,
> My data is in fits format. The is of 1024 * 1024 array. The counts
> vary from 5000 to 6000 and I know that 5500 counts is there in my
> data, but I need to know at which pixel this 5500 counts occur
> exactly, without displaying the image, because I need to do this for
> several files. So each time I can't display and check for the pixel
> position. please helpout in this regard.
> regards

Have you tried WHERE()?
wh = where(IMG EQ 5500)

The pixel position, or position*s* if there more than one, are stored
in the index array WH. This index array addresses the 2-d array as a
1-d array. If you want the X and Y positions separately, then use the
quotient and remainder after dividing by image width...

;; SIZE_X = 1024
ix = wh MOD SIZE_X ;; Remainder
iy = wh / SIZE_X ;; Quotient

Craig

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[Message index]

		Re: How to find the pixel position By: Carsten Lechte on Tue, 27 April 2010 02:58
		Re: How to find the pixel position By: Craig Markwardt on Mon, 26 April 2010 23:26
		Re: How to find the pixel position By: Aram Panasenco on Mon, 26 April 2010 23:24
		Re: How to find the pixel position By: Chris[6] on Thu, 29 April 2010 10:58
		Re: How to find the pixel position By: sid on Wed, 28 April 2010 23:40

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