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Extract Contours From Irregular-Shaped Object After Video Pause

So I have an irregularly shaped object within an AVI video frame. I'm trying to play with the IMAQ Extract Contours function to create a complete silhouette of the object and then overlay it as soon at the user pauses the video. At least that's the goal. This function seems a bit touchy and I don't know if it's the best thing to be using. Does anybody have any better ideas? Or at least know what settings I should be using in order to get the best results out of this?

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attach some image to make your clear but for first answer use wang algorithm for border detection it is nice and you can find example of that in LabVIEW examples 

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