comp.lang.idl-pvwave archive: archive » Re: pixel value to x and y position

Home » Public Forums » archive » Re: pixel value to x and y position

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: pixel value to x and y position [message #67507 is a reply to message #67503]

Thu, 30 July 2009 07:21

marknolan2006
Messages: 5
Registered: February 2009

Junior Member

On Jul 30, 9:25 pm, David Fanning <n...@dfanning.com> wrote:
> mark nolan writes:
>> can anyone check if this is correct way to convert pixel value to x
>> and y position (iam trying
>> to write a simple tracking code in IDL):
>
>> y = pixel_value/width_picture
>> x = pixel_value mod width_picture
>
>> i really have time on the x,it gives a wrong result. i think i got the
>> y coordinate correctly.
>
> I don't think this question can be answered from the way
> you have asked it. (At least I would have to make WAY
> too many assumptions to feel comfortable answering it.)
> What, exactly, are you trying to do?
>
> Cheers,
>
> David
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.dfanning.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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!!

thanks and GOD bless!
mark

Report message to a moderator

[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

Previous Topic:	Re: oplot with colours
Next Topic:	Question about the installation of IDL AACGM DLM

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sat Oct 11 15:44:26 PDT 2025

Total time taken to generate the page: 2.24366 seconds