Browse Prior Art Database

Three-Dimensional Measurement System

IP.com Disclosure Number: IPCOM000101688D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Mathisen, ES: AUTHOR

Abstract

This article describes a system for obtaining three-dimensional (3D) information about an object in order to determine its shape and dimensions for the purpose of inspection of parts or features.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Three-Dimensional Measurement System

       This article describes a system for obtaining
three-dimensional (3D) information about an object in order to
determine its shape and dimensions for the purpose of inspection of
parts or features.

      A number of systems for this purpose have been devised and
described in the literature, i.e., grid coding stereoscopic image
analysis and phase shift technique. However, the disclosed method
offers certain advantages of simplicity and accuracy.

      The electro-optical system disclosed herein is shown in the
drawing.  It includes glass cube 1 with a glass wedge cemented to
each of the four sides.  Viewing an object 2 from above using a TV
camera 3 gives five 2D views on a TV monitor 4.

      The illuminator is provided by a light source 5 projected on
the cube via a beam splitter 6.  The mask 7 is projected by the lens
8 on the top surface of the object 2 providing a reference point for
calculations.   Other features, such as edges, shadows, etc., also
can be used.

      The five 2D views are digitized and processed by machine vision
techniques (*).

      Reference
(*) Image and Vision Computing, Vol. 3, No. 3, August 1985.