Distance distribution measuring method and apparatus varying spa

Details Distance distribution measuring method and apparatus varying spa Distance distribution measuring method and apparatus varying spa

1990-06-20

1991-02-05

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, 356 4, G01J 120

Patent

active

049898272

ABSTRACT:
A distance distribution measuring method includes the steps of disposing an image pickup on the optic axis of a projection optical system, forming on the image pickup the images of objects existing in multiple directions through the projection optical system, progressively varying the spacing in the direction of the optic axis between the projection optical system and the image pickup, extracting substantially in-focus one of the object images on the image pickup for each amount of spacing along with the step of varying the spacing, and finding the distance to an object corresponding to each object image extracted at the step of extracting, on the basis of the amount of spacing when the object image is extracted, thereby obtaining the distances to the objects existing in the multiple directions and measuring the distance distribution.

REFERENCES:
patent: 4254330 (1981-03-01), Stauffer et al.
patent: 4298259 (1981-11-01), Aoki et al.
patent: 4469939 (1984-09-01), Utagawa
patent: 4575626 (1986-03-01), Oinoue et al.
patent: 4589770 (1986-05-01), Jones et al.
patent: 4601053 (1986-07-01), Grumet
patent: 4746790 (1988-05-01), Sorimachi
patent: 4749848 (1988-06-01), Sorimachi
patent: 4762987 (1988-08-01), Ishida et al.
Patent Abstracts of Japan, vol. 10, No. 294 (p-504) (2350), Oct. 7, 1986; & JP-A-61 112 915.

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