How do I detect a change in a 3 frame sequence of images?

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azarm
azarm le 14 Juin 2011
I need to detect smoke in a 3 frame image sequence with time difference.
I segmented some suspicious regions in the image. I need a method to detect if there are changes in the region by using frames. I calculated the NCC value of the region between two frames, but need other methods to decide about smoke.

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Sean de Wolski
Sean de Wolski le 14 Juin 2011
how about an image subtraction or absolute difference?
doc imsubtract
doc imabsdiff
  1 commentaire
azarm
azarm le 15 Juin 2011
well, actually i tried it before. the problem is with compact smoke in close-up range that doesn't chang that much in the sequence. Using diff, the object in some cases would be erased.

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