I have an application which needs to be able to detect the movement of object or image which is shown on camera screen. Is this possible with the iPhone?
Bijoy Thangaraj
You'll need to use a motion detection algorithm to do so.
Check these links. They should help you get started.
Fast, very lightweight algorithm for camera motion detection?
How can you track motion using the iPhone's camera?
来源：https://stackoverflow.com/questions/12382780/how-to-detect-movement-of-object-on-iphones-camera-screen