Visibility monitor employing television camera

Details Visibility monitor employing television camera Visibility monitor employing television camera

1978-09-12

1980-08-05

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

356222, 356435, 358107, 358209, 358903, H04N 530, H04N 702

Patent

active

042164982

ABSTRACT:
Visibility monitoring method and means are disclosed employing a video camera for monitoring an area which includes a low reflectance (substantially non-reflecting) target at known range from the camera and adjacent horizon sky. Window gating circuit means under control of a programmable digital computer are used to gate selected portions of the output from the video camera to integrating means for generating signals related to brightness of at least a portion of the target and adjacent horizon sky. The brightness related to signals are supplied to said digital computer for use in computing visual contrast, visibility, or the like. Preferably, a plurality of substantially non-reflecting targets at different ranges are employed for increased accuracy.

REFERENCES:
patent: 3329821 (1967-07-01), Lesage
patent: 3812483 (1974-05-01), Graves

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