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Tuesday, November 21, 2017

In video surveillance, what is the prevalent basic method of motion detection most cameras or recorders use to detect motion and usually comes free with the product.

In video surveillance, what is the prevalent basic method of motion detection most cameras or recorders use to detect motion and usually comes free with the product.

  • Video Analytics to recognize a person.
  • Pixel changes in the image.
  • Thermal imaging.
  • Passive Infrared (PIR).             
In video surveillance, what is the prevalent basic method of motion detection most cameras or recorders use to detect motion and usually comes free with the product.

EXPLANATION


At the most basic level, most video surveillance cameras and recorders use pixel changes to determine if motion is occurring in the image, usually by the percentage they change and/or amount of contrast change. Thermal imaging is a small percentage of use and in most cases it's not the detection of heat being used, but again the pixel changes in the image that is used. Video Analytics is an advanced form of motion detection that not only detects pixel changes, but also analyzes those shapes to intelligently determine for example if it is a person in the scene vs. a car, animal or bush swaying in the wind, but comes at a premium price, usually as a license fee or if embedded in the camera, then at a premium price attached to the camera, and is not the prevalent form of video motion detection used since it does not come free or at a cheap price with systems sold. Passive infrared (PIR) sensors are common in security, but they have nothing to do with the image the camera sees. Even with cameras that have built in PIR sensors, the sensor detects infrared energy but has nothing to do with analyzing the image.
Video Motion Detection
http://www.cctv-information.co.uk/i/Video_Motion_Detection
Home Eye on Video: Pixel-based intelligent video

http://www.securityinfowatch.com/article/10547228/eye-on-video-pixel-based-intelligent-video
Video content analysis
https://en.wikipedia.org/wiki/Video_content_analysis
Sony Intelligence Video Analytics - Distributed Enhanced Processing Architecture (DEPA)
http://images.synnex.com/images_ca/images/communities/technology_solutions/images/vendors/documents/...

Patent US 8571261 B:System and method for motion detection in a surveillance video
US 8571261 B2
https://www.google.com/patents/US8571261

Passive infrared sensor
https://en.wikipedia.org/wiki/Passive_infrared_sensor
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