Phase difference detection type rangefinder and method of measur

Details Phase difference detection type rangefinder and method of measur Phase difference detection type rangefinder and method of measur

1994-04-19

1996-10-22

Tarcza, Thomas H.

Optics: measuring and testing

Range or remote distance finding

Triangulation ranging with photodetection, but with no...

2502018, 396119, 396128, G01C 308

Patent

active

055682499

ABSTRACT:
A phase difference detection type rangefinder is provided which calculates a distance value of each subject of two or more subjects at different distances. The rangefinder has a correlation calculation unit for calculating a correlation factor between images of a same subject focussed on a base photosensor and a reference photosensor, a second order differentiation unit for calculating second order differential values of correlation factors calculated by the correlation calculation unit, a second order differential value comparison unit for selecting a maximum second order differential value from the second order differential values calculated by the second order differentiation unit, a three-point interpolation unit for calculating an interpolation value through three-point interpolation using the maximum second order differential value and two second order differential values having the phases before and after the phase of the maximum second order differential value, and a distance value calculation unit for calculating a distance value from the phase of the maximum second order differential value and the interpolation value.

REFERENCES:
patent: 4660955 (1987-04-01), Ishida et al.
patent: 4668084 (1987-05-01), Suzuki et al.
patent: 5131740 (1992-07-01), Maekawa
patent: 5189461 (1993-02-01), Ishiguro
patent: 5255064 (1993-10-01), Maekawa
patent: 5257061 (1993-10-01), Ishiguro
patent: 5357310 (1994-10-01), Kawamura et al.

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