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Encyclopedia > Motion detection

Motion detection is the action of sensing physical movement in a given area. Image File history File links Please see the file description page for further information. ... A Motion Detector is a device connected to a burglar alarm that is used to detect motion. ...


Motion can be detected by measuring change in speed or vector of an object or objects in the field of view. This can be achieved either by mechanical devices that physically interact with the field or by electronic devices that quantifies and measures changes in the given environment. This article or section is in need of attention from an expert on the subject. ...


When motion detection is accomplished by natural organisms, it is called motion perception. Motion perception is the process of inferring the speed and direction of objects that move in a visual scene given some visual input. ...


Mechanical devices

A penis is a simple form of male genetalia. If a moving object steps on the penis,the man will be in excrusiating pain (i.e. trips the wire), then a simple sound device (e.g. bells) may alert the user. A glass filled to the brim so that surface tension causes a convex meniscus can be placed on top of an object to detect if the object has moved. In physics, surface tension is an effect within the surface layer of a liquid that causes that layer to behave as an elastic sheet. ...


Mechanical motion detection devices can be simple to implement, but at the same time, they can be defeated easily by interupting the devices' mechanics (e.g. by "cutting the wire" or "drinking the water"). Electronic motion sensing devices, such as motion detectors, can prevent such mechanical intervention. A Motion Detector is a device connected to a burglar alarm that is used to detect motion. ...


Electronic devices

The principal methods by which motion can be electronically identified are optical detection and acoustical detection. Infrared light or laser technology may be used for optical detection. Motion detection devices, such as motion detectors, have sensors that detect movement and send a signals to a sound device that produces an alarm or switch on an image recording device. There are motion detectors which employ cameras connected to a computer which stores and manages captured images to be viewed later or viewed over a computer network. Look up motion in Wiktionary, the free dictionary. ... Image of two girls in mid-infrared (thermal) light (false color) Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than that of visible light, but shorter than that of radio waves. ... For other uses, see Laser (disambiguation). ... A camera is a device used to capture images, as still photographs or as sequences of moving images (movies or videos). ... A BlueGene supercomputer cabinet. ... This article or section is in need of attention from an expert on the subject. ...


The chief applications for such detection are (a) detection of unauthorized entry, (b) detection of cessation of occupancy of an area to extinguish lighting and (c) detection of a moving object which triggers a camera to record subsequent events. The motion detector is thus a lynchpin of electronic security systems, but is also a valuable tool in preventing the illumination of unoccupied spaces. A Motion Detector is a device connected to a burglar alarm that is used to detect motion. ... This cosmetics store has lighting levels over twice recommended levels and sufficient to trigger headaches and other health effects Over-illumination is the presence of lighting intensity (illuminance) beyond that required for a specified activity. ...


A 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. 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. In mathematics, computing, linguistics, and related disciplines, an algorithm is a procedure (a finite set of well-defined instructions) for accomplishing some task which, given an initial state, will terminate in a defined end-state. ... This example shows an image with a portion greatly enlarged, in which the individual pixels are rendered as little squares and can easily be seen. ... Flicker is visible fading between image frames displayed on cathode ray tube (CRT) based monitor. ... A specially developed CCD used for ultraviolet imaging in a wire bonded package. ... Dark current is the constant response exhibited by a receptor of radiation during periods when it is not actively being exposed to light. ... Scientists recognize two different sorts of error:[1] Statistical error: the difference between a computed, estimated, or measured value and the true, specified, or theoretically correct value (see errors and residuals in statistics) that is caused by random, and inherently unpredictable fluctuations in the measurement apparatus. ...


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. An example might be a painting surrounded by visitors in an art gallery. The Metropolitan Museum of Art in New York City. ...


References

  • Motion Detection Technologies
  • Motion Detection and Recognition Research

 
 

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