How to use colour filter with Cuda programming

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From the image (see the attached file), I would like to perform Cuda programming as following procedures

(1) Using colour filter, only green colour is passed

(2) When this part including the green colour is located, I can reuse colour filter to detect where the red spot is

About the above procedures, the red sport and green region is firstly presented in the image

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Please provide any useful suggestion for the application of Cuda code

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Find and Mark a red spot.pptx (169 KB)