Supervisory system using visible ray or infrared ray

Details Supervisory system using visible ray or infrared ray Supervisory system using visible ray or infrared ray

1992-02-18

1993-08-17

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340589, 340630, 358108, 358113, G08B 1700

Patent

active

052373088

ABSTRACT:
A smoke supervisory system comprising a visible image processor for calculating a differential image between a reference image and an input image and calculating parameters in the differential image; an address overlap detector for detecting whether the differential images overlap each other; an image element number change detector for detecting a change in the image element number of the differential image; and an address ratio change detector for calculating an address ratio of the differential image; or an equipment supervisory system comprising an image fetch device for fetching a reference image and an input image from an infrared image pick up device; a mask control device for masking the reference image and the input image; a differential operation device for calculating a differential image of an unmasked dividing image; a temperature distribution difference detector for detecting a maximum temperature and a mean temperature of a temperature distribution from the differential image and calculating a temperature distribution difference; and when the calculated temperature distribution difference is more than a predetermined level, detecting an abnormal sign. By using this invention, in any environmental conditions, early detection of smoke generation is automatically executed and early and accurate detection of an abnormal temperature can be realized.

REFERENCES:
patent: 4999614 (1991-03-01), Ueda et al.
patent: 5121201 (1992-06-01), Seki
patent: 5133605 (1992-07-01), Nakamura

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