Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1989-05-01
1990-11-06
Perkey, W. B.
Optics: measuring and testing
Range or remote distance finding
With photodetection
354432, 356221, 356222, G03B 1505, G01J 142
Patent
active
049690051
ABSTRACT:
A device for detecting a backlighting condition comprising a light meter of which the image receiving surface is divided into a central area, an intermediate area and a marginal area, and a circuit for discriminating between true and false backlighting conditions in such a way that when the luminance of the marginal area is greater than that of the intermediate area by more than a predetermined value and when the luminance of the intermediate area is greater than that of the central area, the backlighting condition in question is taken as a true one.
REFERENCES:
patent: 4445778 (1984-05-01), Nakauchi
patent: 4734733 (1988-03-01), Clapp et al.
patent: 4782357 (1988-11-01), Hayakawa et al.
patent: 4786935 (1988-11-01), Hayakawa et al.
Canon Kabushiki Kaisha
Perkey W. B.
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