Masters Theses

Date of Award

3-1985

Degree Type

Thesis

Degree Name

Master of Science

Major

Engineering Science

Major Professor

Dennis R. Keefer

Committee Members

Firouz Shahrokhi, Kenneth Kimble

Abstract

A technique has been developed to make accurate spatial measurements of the internal parts of objects from the digitized x-ray images of these objects. The technique involves the comparison of the x-ray image with each of a series of theoretical images which are produced by a computer model. When the theoretical image which best fits the actual image is found, the input parameters of the theoretical image are taken as estimates of the actual input parameters of the x-ray image.

The method used to compare the actual and theoretical images is based on the cross-correlation function. The cross-correlation function reveals the degree of similarity between the actual image and each of the theoretical images. The theoretical image yielding the highest correlation value is then the image which best fits the actual image.

The technique was tested by applying it to measure the inner hole radius of a hollow plastic cylinder. The cylinder was x-radiographed, and the image was digitized and analyzed. The analysis resulted in an estimate within 0.0005 cm of the machined radius of 1.7780 cm.

Download
Files over 3MB may be slow to open. For best results, right-click and select "save as..."

Share

COinS