Pop quiz: Clapping hand

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I'm working on a project where I have to detect hands clapping - ideally where the hands meet; the approaches I've tried thus far are: - getting the centre of gravity from the last frames mask (using the absolute difference from an accumulated background image)

• centre of gravity on a mask based on skin thresholding

• optical flow; I group all the features based on distance and work out the average distance between the 2 largest groups.

(2 example images shown below).

The user can clap anywhere (ie not in a controlled environment/situation).

Any suggestions, hints, tips, solutions would be greatly appreciated,

Josh