An example might be a painting surrounded by visitors in an art gallery. More complex algorithms are necessary to detect motion when the camera itself is moving, or when the motion of a specific object must be detected in a field containing other movement which can be ignored. Since images will naturally differ due to factors such as varying lighting, camera flicker, and CCD dark currents, pre-processing is useful to reduce the number of false positive alarms. The chief applications for such detection are detection of unauthorized entry, detection of cessation of occupancy of an area to extinguish lighting, and detection of a moving object which triggers a camera to record subsequent events.Ī simple algorithm for motion detection by a fixed camera compares the current image with a reference image and simply counts the number of different pixels.

Once detected, a signal can activate an alarm or a camera that can capture an image or video of the motioner. Motion detection devices, such as PIR motion detectors, have a sensor that detects a disturbance in the infrared spectrum. Infrared light or laser technology may be used for optical detection. The principal methods by which motion can be electronically identified are optical detection and acoustic detection. Each letter that appears is a result of motion on that corresponding key and the switch being turned on. Each key is a manual switch that is either off or on. For example, the keys of a typewriter employ a mechanical method of detecting motion. The most basic form of mechanical motion detection is in the form of a switch or trigger.

Magnetism (magnetic sensors and magnetometers).

Vibration (triboelectric, seismic, and inertia-switch sensors).

Sound (microphones and acoustic sensors).Radio Frequency Energy (radar, microwave and tomographic motion detection).When motion detection is accomplished by natural organisms, it is called motion perception. Motion detection can be achieved by either mechanical or electronic methods. Motion detection is the process of detecting a change in the position of an object relative to its surroundings or a change in the surroundings relative to an object.

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