Draw a line at a threshold of high colour contrast

Hello,
I'm wanting to write a script where photoshop can analyse a photo and draw a line where there is a high contrast of adjacent pixels. So i'd need a pixel differentiating script (like magnetic wand) which preceeded a draw line script i guess.
Example: A photo of white circles on a black background, where circles are drawn over the top of the white circles.
Any ideas?
cheers

Sounds like Illustrator's Live Trace feature…?

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I have been BEATING my head on this for well over a week now. I'm new to Java2D and I cannot find even one example of this simple little thing that I am trying to do. Not one.
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 int dx1, int dy1, int dx2, int dy2,
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Dear Experts,
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Draw a line at a threshold of high colour contrast

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