I am the programmer for team 4983, and I have been working on getting vision processing to work for our team since last year. I seem to be having trouble just getting the GRIP software to pick up the reflection from our LED ring light.
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Included in the kickoff release of WPILib are some photos we took with a USB camera and LED ring. Also in the ZIP file is an example GRIP pipeline. I would compare the images you see and your pipeline to the sample images and pipeline.
https://github.com/wpilibsuite/allwpilib/releases/download/v2020.1.2/2020SampleVisionImages.zip
I think something that will make the vision problem more manageable is to turn down the exposure setting on the camera. Your original image should look more like the samples - where the only thing that is not black is the retro reflective tape and maybe some direct light sources.
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