Range finder for passive type autofocussing device

Details Range finder for passive type autofocussing device Range finder for passive type autofocussing device

1992-02-12

1993-12-28

Gellner, Michael L.

G03B 1318, G03B 310

Patent

active

052744159

ABSTRACT:
A range finder for a passive type autofocussing device includes three photosensors comprising three line sensors. Differences of the luminance distribution of a scene detected by the respective photosensors are computed and the zero-cross points of the difference are detected. The zero-cross behaviors thus detected are compared to one another with the zero-cross behavior associated with one of the three line sensors being selected as a reference and the zero-cross behaviors associated with the other two line sensors being successively shifted relative to said reference until a coincidence of the zero-cross behaviors associated with the three line sensors is detected. The range to the scene is computed based on an amount that the zero-cross behaviors associated with the other two line sensors has to be shifted until coincidence is detected.

REFERENCES:
patent: 4373791 (1983-02-01), Araki
patent: 4575626 (1986-03-01), Dinoue et al.
patent: 4616264 (1986-10-01), Pshtissky
patent: 5070353 (1991-12-01), Komiya et al.

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