Perimeter surveillance system
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United States of America Patent
Stats
-
Feb 3, 1981
Grant Date -
N/A
app pub date -
Nov 26, 1979
filing date -
Feb 20, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed is an automatic video intrusion detection system. The system monitors a given area such as between two parallel fences. The image of the given area is divided into an array of cells each approximately equal in size to the image of a man. The video for each cell is integrated, digitized and stored in an array. Changes in cell values are detected and tracked so that changes in, say, 3 adjacent cells in a given direction, indicate an intruder. A microcomputer implements a tracking algorithm. Filtering discriminates against light level changes. The system is simpler than a known one which analyzes grey values of thousands of points in a video field.
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