Sponsor
Portland State University. Department of Mechanical Engineering
First Advisor
Faryar Etesami
Term of Graduation
Fall 1990
Date of Publication
11-2-1990
Document Type
Thesis
Degree Name
Master of Science (M.S.) in Mechanical Engineering
Department
Mechanical Engineering
Language
English
Subjects
Image processing -- Digital techniques, Optical pattern recognition, Manufactures -- Inspection, Algorithms
DOI
10.15760/etd.6033
Physical Description
1 online resource (2, v, 57 pages)
Abstract
Image processing systems used in Vision Assisted Dimensional Inspection usually output a set of boundary pixels representing the part edges. This boundary information must be divided into several subsets representing the various edges of the actual object, so that comparisons with the nominal part can be made.
The purpose of this project is to devise a method to divide the set of pixels obtained from the image processing system into subsets of pixels. Each of these subsets represent an edge in the contour of the actual object. This method must also detect transition points between the adjacent features. This project addresses only planar contours which are composed of straight and circular edges. Two new algorithms have been developed, the first algorithm detects the transition points involving straight edges and the second algorithm finds the transition points when circular features are involved. In addition, the measured features are also matched with their nominal counterparts. The performance of these algorithms are demonstrated by simulated as well as images from the vision system.
Rights
In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
Persistent Identifier
https://archives.pdx.edu/ds/psu/23818
Recommended Citation
Rajkumar, Devaraj, "Decomposition of Measured Contours into Geometric Features for Dimensional Inspection" (1990). Dissertations and Theses. Paper 4149.
https://doi.org/10.15760/etd.6033
Comments
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