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Re: pixel value to x and y position [message #67503 is a reply to message #67502]

Thu, 30 July 2009 08:51

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

mark nolan writes:

> i have a multi tiff file, pictures of a moving bead. we would
> like to track the movement of the bead. we first subtract
> background, then clean it up by setting up threshold and then
> i used the morph_open. finally we label the regions and
> descriminate our bead from others (by area matching). we then
> call the pixels that are in those regions. using the formula
> above we calculate the x and y for each pixel and then average
> it (i.e. total(x)/num_of_pixels). the y seems to be ok however
> we have weird results for the x. please help me!!

I don't know what "call the pixels" means, but if
you mean "identify the indices of the pixels in the
region of interest" with something like the WHERE function,
then I don't see any reason why you would have to know
the columns and rows. But, if you did, you could use
ARRAY_INDICES to obtain them.

Cheers,

David

--
David Fanning, Ph.D.
Coyote's Guide to IDL Programming (www.dfanning.com)
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: pixel value to x and y position By: marknolan2006 on Thu, 30 July 2009 18:13
		Re: pixel value to x and y position By: cgguido on Thu, 30 July 2009 08:53
		Re: pixel value to x and y position By: David Fanning on Thu, 30 July 2009 08:51
		Re: pixel value to x and y position By: marknolan2006 on Thu, 30 July 2009 07:21
		Re: pixel value to x and y position By: David Fanning on Thu, 30 July 2009 06:25
		Re: pixel value to x and y position By: MichaelT on Thu, 30 July 2009 05:18
		Re: pixel value to x and y position By: marknolan2006 on Fri, 31 July 2009 00:45

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