About Frame Subtraction for RGB image to detect red values

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Mavin Jitendra
Mavin Jitendra el 21 de Abr. de 2016
in this code here to detect red coloured objects from RGB images.
He uses frame subtraction, subtracting the grey frame from the red frame.
What is the theory behind this?
Why does the red object only remain after the two frames are subtracted?
Need a quick reply!
Thank you!

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