Apparatus for obtaining three-dimensional volume data of an obje

Details Apparatus for obtaining three-dimensional volume data of an obje Apparatus for obtaining three-dimensional volume data of an obje

1992-09-02

1994-04-19

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

356379, G01B 1124

Patent

active

053050924

ABSTRACT:
An apparatus for obtaining three-dimensional volume data indicative of the shape of an object by processing the video signal resulting from picking up the object has an image projector for projecting a two-dimensional reference optical image containing a large amount of spatial high-frequency components on the surface of the object, a two-dimensional image pickup device for sequentially picking up the image of the object on which the two-dimensional optical image is projected, while the focal plane is being shifted, a range finder for extracting the high-frequency components of an image signal of a very small region including each of a plurality of detection points on the image picked up by said image pickup device, and detecting the best focal plane position where an in-focus condition is given, for each of the plurality of detection points from the change of the high-frequency components with the shift of the focal plane, and a memory for storing data of the best focal plane detected for each of the detection points as the three-dimensional volume data of the object.

REFERENCES:
patent: 4585704 (1986-04-01), Ferren
patent: 5151609 (1992-09-01), Nakagawa et al.
Handbook of Optical Measurement, edited by T. Denko, Asakura Shoten Co., Ltd., pp. 582-595.
"Digital Composition of Images with Increased Depth of Focus Considering Depth Information", Satoshi A. Sugimoto and Yoshiki Ichioka, Applied Optics, vol. 24, No. 14, 1985.

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