I want to make a sketch in which , I will have 4 images in my hand (e.g. image1, image2, image3, image4). And screen background will be a webcam feed(i.e webcam capture). Now if a user shows image1 to camera then, movie1 should play,  if a user shows image2 to camera then, movie2 should play,  if a user shows image3 to camera then, movie3 should play and  if a user shows image4 to camera, then movie4 should play. In short camera should recognize an image and according to it play the movie.  But I don't know about the image recognition in realtime .

Can anyone help me...???

regards ,

Archana