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Calculate and compare the amount of two colours in a video

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Hello all,

I'm trying to detect, calculate and compare the amount of two colours present in a webcam feed.
something similar to what is being done here http://forum.processing.org/topic/compare-measurement-of-x-color-pixels-compared-to-background. Except I would like to use coloured cards, say red and green, and by holding them up to the camera being able to tell which is more prominent in the video - and from their calculating the ratio.

I'm not completely sure how to implement this with a video feed from a webcam and i'm just looking for some advice on how to go about the logic. Any input or direction to something similar would be greatly appreciated.

many thanks


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