Range finder for passive-type autofocusing device

Details Range finder for passive-type autofocusing device Range finder for passive-type autofocusing device

1993-04-06

1993-11-23

Gellner, Michael L.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

2502016, G03B 300

Patent

active

052648915

ABSTRACT:
A range finder for an autofocusing device includes three photosensors or a photosensor including three section. An output signal from the line sensor representing a luminance distribution of the scene is A/D converted. A secondary difference of the output signal from the line sensor thus A/D converted is interpolated to compute and detect a zero-cross point. The zero-cross data obtained in this manner are stored, each in the form of interpolated zero-cross location data and polarity data within a single pixel. The zero-cross behavior signals obtained from two of the photosensors are successively shifted relative to the zero-cross behavior signal obtained from the other photosensor until a coincidence of the zero-cross location data and the polarity data of the three photosensors is detected. A range to the scene is computed from a total amount of shifting at the moment of the coincidence.

REFERENCES:
patent: 4387975 (1983-06-01), Araki
patent: 5189461 (1993-02-01), Ishiguro

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