Extraneous Lighting

[Greg McKaskle]

The field typically has around 30 floodlights on each side of the field, which output warm white light. If you were to plot their power vs spectrum from 400nm to 700 nm, they would be pretty flat, but higher in the red end of the range. So any analog optical filter will see them as a really bright spot of your filter color plus a haze of the filter color as the light from the flood hits the entire sensor

I think it is pretty safe to think of the color threshold as a color filter operation, but it can differentiate between white and other color combinations, not just a single peak like optical filters. So the purpose of doing this would be to replace the digital filter with an analog to get rid of the processing, but as noted, you can't substitute them one-for-one.

Greg McKaskle