Distance measurement apparatus and method

Details Distance measurement apparatus and method Distance measurement apparatus and method

2011-07-05

2011-07-05

Alsomiri, Isam (Department: 3662)

Optics: measuring and testing

Range or remote distance finding

With photodetection

Reexamination Certificate

active

07973913

ABSTRACT:
Emitting stripe pattern light, whose intensity changes periodically, onto a subject while shifting the phase of the pattern by π/2 from a reference phase of 0 until the phase is shifted one cycle to receive reflected light by an image sensor at each of phases 0, π/2, π, and 3π/2. From received light signals obtained at four phases, calculating a phase difference between the stripe pattern light and reflected light thereof with respect to each light receiving element to calculate distance information representing a distance to the subject based on the phase difference. In this case, the distance information is calculated only from a light receiving element having an absolute value of the difference between a first added signal of received light signals at 0 and π and a second added signal of received light signals at π/2 and 3π/2 smaller than a specific value.

REFERENCES:
patent: 7645974 (2010-01-01), Ikeno et al.
patent: 2008/0205709 (2008-08-01), Masuda et al.
patent: 2006-23178 (2006-01-01), None
patent: 2006-201037 (2006-08-01), None
patent: 2006-337286 (2006-12-01), None

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