The Display-Stereocomparator, A New Device For Biostereometric Measurements

E. Hierholzer

doi:10.1117/12.956923

29 July 1980 The Display-Stereocomparator, A New Device For Biostereometric Measurements

E. Hierholzer

Proceedings Volume 0166, NATO Symposium on Applications of Human Biostereometrics; (1980) https://doi.org/10.1117/12.956923
Event: NATO Symposium on Applications of Human Biostereometrics, 1978, Paris, France

Abstract

The display stereocomparator, which was primarily designed for the evaluation of stereoradiographs, is quite similar to the common stereocomparator, except that the usual point-shaped target is replaced by a complete stereoscopic image pair of a model body. The model body is superimposed to the spatial image by semi-transparent mirrors. The image pair of the model body is calculated by a computer simulation of the stereoscopic projection and is displayed on cathode ray tubes which are on-line connected to the computer. Also by computer simulation the model body can be shifted and rotated in three dimensions, and its shape and size can be altered. Motions and deformations can be continuously controlled by interactive data input with potentiometers. Thus the model can be fitted to the structures seen in the spatial image; this is equivalent to a three-dimensional measurement. The advantages of the display-stereocomparator, especially in the case of irregular bio-logic structures are discussed. Applications of the device are demonstrated for the measurement of scoliotic spines and for the fitting of implants. Furthermore the display-stereocomparator can be used in some non-stereoscopic measurements. An example of this application using monocular vision of the two images is given in the paper of B. Drerup and W. Frobin (Munster).

Citation Download Citation

E. Hierholzer "The Display-Stereocomparator, A New Device For Biostereometric Measurements", Proc. SPIE 0166, NATO Symposium on Applications of Human Biostereometrics, (29 July 1980); https://doi.org/10.1117/12.956923

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