Apparatus for detecting relative crowding in a hall

Details Apparatus for detecting relative crowding in a hall Apparatus for detecting relative crowding in a hall

1988-09-09

1990-05-08

Lall, Parshotam S.

Boots, shoes, and leggings

358108, 34082506, 362276, 315151, 187130, 187131, H05B 3702, H04N 718

Patent

active

049244167

ABSTRACT:
An apparatus detects the degree of crowding in an elevator hall utilizing a television camera to provide video signals which are stored as video data and including an illumination controller which controls the brightness of an illuminator for the elevator hall when the difference between reference data and video data has exceeded a predetermined value and has continued for a predetermined time, so that the difference between the reference data and the video data may fall within the predetermined value.

REFERENCES:
patent: 4135116 (1979-01-01), Smith
patent: 4467246 (1984-08-01), Tanaka et al.
patent: 4516055 (1985-05-01), Nelson
patent: 4555724 (1985-11-01), Enriquez
patent: 4595860 (1986-06-01), Taylor
patent: 4646140 (1987-02-01), Bailey et al.
patent: 4701669 (1987-10-01), Head et al.
patent: 4703344 (1987-10-01), Hisano et al.

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