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This classifier uses a lookup table to map RGB values to a best effort combination of Foreground, Background and PIXEL_XXXX setting. I wrote a separate little tool to generate the lookup table.
Results do not look to bad, but the cost of doing the per pixel matching takes a toll on the framerate, this needs to be run in Release mode to get a semi-reasonable frame rate. I am thinking that there might be an algorithmic approach to getting the same results without a lookup table, but I have not spent anytime looking at that.