US Patent 7190263 Utilizing a portable electronic device to detect motion

A mobile telephone (105) with a camera feature (110) that functions as a motion detection device. The mobile telephone can include an image capture software routine (120) and a motion detection software routine (125). The image capture software routine can use the camera feature to automatically generate one or more time spaced images. The motion detection software routine can detect motion based upon differences between the time spaced images. The motion detection software routine can selectively utilize a multiple algorithms.