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Perhaps use the pattern used by rotary encoders? https://en.wikipedia.org/wiki/Rotary_encoder#Ways_of_encodin...

See https://www.youtube.com/watch?v=oc5hIxdCMZ0 for a visual example.

I'll certainly read up on this. I noticed the struggles in using gray scale (night vision images) can be tricky. I have a few ideas but I'll certainly look into this.

thanks!

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