Evaluation Of Bi-Plane Radiographs By Epipolar Ray Correlation

B. Drerup; W. Frobin; G. Haussler

doi:10.1117/12.956946

29 July 1980 Evaluation Of Bi-Plane Radiographs By Epipolar Ray Correlation

B. Drerup, W. Frobin, G. Haussler

Proceedings Volume 0166, NATO Symposium on Applications of Human Biostereometrics; (1980) https://doi.org/10.1117/12.956946
Event: NATO Symposium on Applications of Human Biostereometrics, 1978, Paris, France

Abstract

A problem in evaluating bi-plane radiographs is the determination of corresponding points. If the angle of convergence is small, this can be done by stereoscopic vision. In the case, when this angle is large and no stereoscopic vision is possible, epipolar rays may be used for supporting the image evaluation. The proposition of epipolar ray correlation is: corresponding image points lie on con-jugate epipolar rays emerging from centers in each of the two image planes. The conjugate rays intersect in the intersection line of the two image planes. For the construction of the epipolar rays different methods can be used: 1) - Mechanically, the epipolar rays can be represented by two threads, one for each radiograph. The correspondence of the threads, also when moved over the images, is established by a simple gear system. An apparatus based on this concept is shown. With this apparatus evaluations of radiographs can be done point by point. 2) - Electronically, the epipolar lines can be plotted by a computer on transparent paper, so that by contacting the radiographs with the drawn lines, again a point by point evaluation is possible. 3) - The epipolar rays can be generated and superimposed to the radiographs by means of the display-stereocomparator described in the paper of E. Hierholzer. As a stereoscopic vision is not possible in most cases of bi-plane radiographs, this device has to be used monocularly.

Citation Download Citation

B. Drerup, W. Frobin, and G. Haussler "Evaluation Of Bi-Plane Radiographs By Epipolar Ray Correlation", Proc. SPIE 0166, NATO Symposium on Applications of Human Biostereometrics, (29 July 1980); https://doi.org/10.1117/12.956946

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available