When New York City Mayor Michael Bloomberg and Police Commissioner Raymond Kelly announced April 25 that the FBI told them that the Boston Marathon bombers had planned to put a bomb in New York City's Times Square, Commissioner Kelly said he put more cameras on his security wish list. “It’s called ‘video analytics,’” Commissioner Kelly said.
So what is “video analytics”?
Cameras with on-board video analytics detect targets in the outdoors with a high degree of accuracy, minimizing nuisance alarms and lowering overall costs. This level of detection accuracy is reached by placing a high degree of image processing into the camera. The processors stabilize the image to adjust for camera motion and filter movements from trees, leaves, shadows and water reflections, before video analysis take place.
Advanced detection capabilities cover a wide range of behavioral events. During initial calibration, each camera is geo-referenced to the scene which provides the exact location, speed and size of detected targets. Knowing the location and size of targets is the key for accurate outdoor detection.
The following methods of target detection are possible with video analytics (this list is genericized from a list of functions of a specific product, the SightLogix SightSensor):
• Over 50 individual restricted areas, each with an unlimited number of rules possible.
• Motion tracking
• Control alarm detection according to time of day
• From/to zones
• Target-size filtering eliminates objects smaller or larger than a specific height or specific width and objects smaller or larger than a specific aspect ratio
• Wrong-way direction
• Loitering monitoring
• Tracking certain sized objects, but do not alarm on them
• Object left behind
• Speed alarm detection (either above or below a user specified threshold)
• Automated pan, tilt, and zoom control
• Selectable tracking priority (newer, faster, closer, etc)
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