RE: Minimum spanning circles and Voronoi diagrams

[Tom Droege <tdroege2@earthlink.net>]

The below suggestion by Chris gets back to what I was proposing.  Take a 
bunch of data of cleanly separated stars.  Fit something like a psf.  Now 
go through the real data.  Try to fit the psf.  Note that this is just what 
we are doing in the first pass star finding.  At this point, I would just 
throw out the stars that do not fit the psf well.  This would indicate 
blended stars and the like.

Well, first, I would run in a mode where each star found was plotted on a 
screen in front of me and I looked at the data that was plotted and what my 
rules said to do with the found object.  But note again, that each "star" 
plotted is actually all the "findings" of that star from many 
runs.  Plotted in x, y, number of hits space.

Tom Droege

At 03:37 PM 2/6/02 -0800, you wrote:
>I was thinking that if you had two stars you could superimpose
>the two hills.  You'd have a double peaked hill.  Now look
>at the hieght of the saddle between the two peaks if > N
>(with N about 2) then you have one star not two.
>Finding the minima of a line connecting the two stars is
>not to hard to compute
>
>Still, I'd just compute the angle between the stars and
>apply a threshold.
>
>In the real world the problem is that in some images double
>stars resolve and in others they do not.  When they do resolve
>they are both inside each other's one sigma error bound.  Now
>when the double does not resolve which of the pair is it asigned
>to?   None of the above address this problem and it is the
>one we will see.  If not for this my simple thresholding
>would work