text: how can i make a target acquisition turret? for small project to track a selective target after target recognition say of either sound or light wave. example spider man has been recognize out of a group of suspects i now want target acquistion of target and because spider man moves around quite a bit stalking his next victim i want to keep him in my remote gun sights. most video codecs, like the one in your webcam, use a system of compression that counts on sameness. that is, it only reports that the video needs to change if it percieves a substantial change, like your subject moving.  you might be able to use a webcam or similiar, and write a little code, perhaps in visual basic, that would exploit this trick. have it give your turret x,y coordinates of the originally chosen weirdo in red, and stay with that red.  i've seen this implemented on digital cameras for focus tracking.   good luck, this is a doozy.