Portland State University. Department of Mechanical Engineering
Date of Award
Master of Science (M.S.) in Mechanical Engineering
1 online resource (66 p.)
Image processing -- Digital techniques, Optical pattern recognition, Manufactures -- Inspection, Algorithms
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.
Rajkumar, Devaraj, "Decomposition of measured contours into geometric features for dimensional inspection" (1990). Dissertations and Theses. Paper 4149.