| Re: pixel value to x and y position [message #67487] |
Thu, 30 July 2009 18:13  |
marknolan2006
Messages: 5
Registered: February 2009
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Junior Member |
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On Jul 30, 11:53 pm, Gianguido <gianguido.cia...@gmail.com> wrote:
> On Jul 30, 4:27 am, mark nolan <marknolan2...@gmail.com> wrote:
>
>> hi everyone!
>
>> 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.
>
>> thanks and GOD bless!
>
>> mark
>
> is array_indices what you are looking for? how about using these free
> particle tracking procedures:http://www.physics.emory.edu/~weeks/idl/
>
> G
hey, ill try that, actually i dnt know that function, this would be my
first
time (iam new at idl).
thanks alot G and David!
GOD bless!
mark
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| 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
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Junior Member |
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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
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| Re: pixel value to x and y position [message #67567 is a reply to message #67487] |
Fri, 31 July 2009 00:45 |
marknolan2006
Messages: 5
Registered: February 2009
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Junior Member |
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On Jul 31, 9:13 am, mark nolan <marknolan2...@gmail.com> wrote:
> On Jul 30, 11:53 pm, Gianguido <gianguido.cia...@gmail.com> wrote:
>
>
>
>
>
>> On Jul 30, 4:27 am, mark nolan <marknolan2...@gmail.com> wrote:
>
>>> hi everyone!
>
>>> 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.
>
>>> thanks and GOD bless!
>
>>> mark
>
>> is array_indices what you are looking for? how about using these free
>> particle tracking procedures:http://www.physics.emory.edu/~weeks/idl/
>
>> G
>
> hey, ill try that, actually i dnt know that function, this would be my
> first
> time (iam new at idl).
>
> thanks alot G and David!
>
> GOD bless!
> mark- Hide quoted text -
>
> - Show quoted text -
i dnt know how you do it guys but your just briliant! the
array_indices work!! whooh!! thanks alot!
GOD bless and continue to be a blessing!
Cheers,
mark
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