[Insight-users] one problem of searching stars from sky

[Luis Ibanez]

Hi Tao,

Your problem looks very interesting.

However,
It wasn't clear for me, from the description in your email,
whether the list of bright points are indeed pixels that are
connected to each other and that form a single star or not.

If they are connected, then, you can certainly use the
filters that Kishore and Lynx suggested.

However, if you are trying to define a given star by
aggregating a set of bright pixels that are not
connected, then you may have to pursue other
techniques.

Please let us know more details about the problem.

(a screenshot of one of the image will be ideal...)


     Thanks


             Luis


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On Wed, Oct 28, 2009 at 12:56 PM, Tao Dai <uniquedai at gmail.com> wrote:
> Dear Luis and ITK list:
>
> I am working on one project and trying to do some work like "finding
> stars":  Assuming there're lots of stars (difference size/brightness) in the
> night sky, I wanna extract those stars and calculate areas and brightness
> for each.
>
> What I am doing first is a binary thresholding
> (itk:BinaryThresholdImageFilter) and it works well.  However, I don't know
> how to define a cluster of bright points which make a single star. I don't
> know if this make me clear. Let's try another way to clarify: how to know
> which points are from the same star? any examples available in ITK?
>
> Thanks for any input.
>
> Tao
>