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Dynamic colouration of zones visualized by a flying camera

i have an image (img_tot) printed on a plane and a down-facing camera flying on it and acquiring a frame, every time step "k", of a portion of such a plane. i have to store all the images (one each time step) representing img_tot with the portion represented by frame(k) coloured in a certain way. As if i had to highlight all the zones visualized by the camera in the plane How can I do??