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How do you get the default vision codes to work
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Have you followed the tutorial? If you are using your camera with your lighting, it may be necessary to calibrate the color ranges. This is good practice since you will run into this at an event/demo. It is really pretty easy once you understand what H, S, and V mean. Once the mask looks good, the rest is basic trig and math.
Feel free to ask more detailed questions, post images showing the state of failure, and I can give more detailed assistance.
Greg McKaskle