A Stereophotogrammetric Method For The Measurement Of Body Surfaces Using A Projected Grid

W. Frobin; E. Hierholzer

doi:10.1117/12.956925

29 July 1980 A Stereophotogrammetric Method For The Measurement Of Body Surfaces Using A Projected Grid

W. Frobin, E. Hierholzer

Proceedings Volume 0166, NATO Symposium on Applications of Human Biostereometrics; (1980) https://doi.org/10.1117/12.956925
Event: NATO Symposium on Applications of Human Biostereometrics, 1978, Paris, France

Abstract

A simplified stereophotogrammetric method for the measurement of body surfaces is presented. The advantage of this method in comparison with common stereophotogrammetry is that only one photograph has be evaluated. The technical equipment consists of a projector with a grid slide and a camera. This is equivalent to the common arrangement for stereophotography, if the directions of the light rays emerging from the projector are thought of having been reversed. So the grid slide and the photograph form some sort of a stereo image pair. The grid is projected on the surface to be measured. The evaluation of the photographs is accomplished by the identification of corresponding points. The correspondance can easily be established by counting the crosspoints of the grid. The coordinates of the grid points in the slide can be calculated by this count, whereas those in the photograph have to be measured. Thus a correlation of two images by stereoscopic vision is not necessary. The measurement can be performed with a simple di-gitizer.The calibration of the apparatus is done by using landmarks and solving the normal equations for the orientation elements of the camera and of the projector. With a slight modification the method can be employed for quasi-continuous measurements of the body surface along projected grid lines.

Citation Download Citation

W. Frobin and E. Hierholzer "A Stereophotogrammetric Method For The Measurement Of Body Surfaces Using A Projected Grid", Proc. SPIE 0166, NATO Symposium on Applications of Human Biostereometrics, (29 July 1980); https://doi.org/10.1117/12.956925

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