The tricky part is that those signals, those changes that we're after, are extremely subtle, so we have to be very careful when you try to separate them from noise that always exists in videos.
Problematično je to što su ti signali, te promjene koje tražimo iznimno suptilni i moramo biti jako oprezni kad ih pokušavamo razdvojiti od buke koje uvijek ima na snimkama.