Automatic door system and method for controlling automatic door
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United States of America Patent
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Feb 5, 2002
Grant Date -
N/A
app pub date -
Feb 9, 1999
filing date -
Sep 1, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an automatic door system and a method for controlling an automatic door, the automatic door is not opened when a passerby just passes by the door. A data processing device (5) produces a differential image by subtracting an initial image from a detected image on the basis of digital data entered from a subtractor (4), and judges whether a gray-scale shadow is in the differential image or not. When a gray-scale shadow appears in the differential image, the data processing device (5) calculates the maximum width (X.sub.m) of the gray-scale shadow in the X direction to compare it with a predetermined threshold value (X.sub.th). When the maximum width (X.sub.m) is equal to the threshold value (X.sub.th) or more, the data processing device (5) judges that a passerby faces toward an automatic door (1), and outputs a driving control signal (C) for opening the automatic door (1).
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Cited Art Landscape
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