Apparatus for measuring three-dimensional curved surface shapes

Details Apparatus for measuring three-dimensional curved surface shapes Apparatus for measuring three-dimensional curved surface shapes

1990-03-20

1992-04-07

Rosenberger, Richard A.

Optics: measuring and testing

By polarized light examination

With light attenuation

G01B 1124

Patent

active

051022249

ABSTRACT:
A three-dimensional curved surface shape measuring apparatus of the slit light linear scanning type. In accordance with a composite image u(x', y') produced by image composing means when a slit light is scanned over a surface of an object to be measured, a measured value or computed value u.sub.o (x', y') of a composite image with respect to a reference plane, a light projecting angle .theta. to the reference plane and a reference plane-television camera distance a, a necessary computational processing is performed to determine a three-dimensional curved surface shape f(x, y) of the surface of the object which is free of any distortions due to a perspective effect of the television camera.

REFERENCES:
patent: 3692414 (1972-09-01), Hosterman et al.
patent: 4472056 (1984-09-01), Nakagawa et al.
patent: 4794262 (1988-12-01), Sato et al.
"Method and Its Trial Instrumentation for 3-D Shape Measurement" by Araki et al.
Handbook for Image Processing, published Jun. 6, 1987 by Shokodo Co., Ltd., pp. 392-407.

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