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From: Gus Lott on 12 Jun 2010 07:35
So I've got an object where I've set up the lighting conditions such that the object is dark and the background is light. I select a threshold and apply it to the object. It seems that, due to noise, the perimeter of the object jitters when I extract it.

I want to do perimeter analysis (fourier descriptors to start with). My centroid derived from the perimeter jitters quite a bit when the full object appears stable to the eye.

Is there any way to deal with noisy fluctuations in the perimeter of a thresholded object from frame to frame in video? Smoothing, low pass filtering, etc, carries the jitter with it.
From: ImageAnalyst on 12 Jun 2010 10:03
You can try various noise reduction techniques, but you may not ever
be able to get rid of it all. Therefore whatever routine is taking
your Fourier descriptors (once you've determined them) must be robust
enough (haven enough tolerance) to handle slight variations.
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