About Frame Subtraction for RGB image to detect red values

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Mavin Jitendra
Mavin Jitendra 2016년 4월 21일
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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