Green Screen Replacement

Our most recent project is green screen replacement.
The screen needs to be treated as green regardless of dark green or light green, and regardless of the brightness of the lighting, e.g. indoors or outdoors.
I used the HSV color space. A narrow threshhold was set on Hue component, with a wider threshold on Saturation, for what kind of green, and Value, for the lighting.
Here is my intuitive way of viewing HSV, which is not accurate, but worked in this project:
We make color by mixing paint with water, and shining light on it. Hue is the color of the paint, Saturation is how much paint to mix, Value is how much light to shine.


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