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GEOMETRICAL DESCRIPTION OF A THREEDIMENSIONAL
THE XRAY PHOTOGRAPH AS A CENTRAL PROJECTION
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accuracy angles Appendix approximately assumed basic bcos become bundles of rays calculated calibration procedure central projection centre point coefficients computed consequently coordinate relations coordinate system correct corresponding coso defined denoted derived determined differential formulas discrepancies displacements elements of orientation elevation differences equations error of unit estimated exposure expressions fiducial marks focus functions gonal gross errors image coordinates image plane image points instance interior orientation intersection irregular errors left photograph lens located mathematical mathematical plane object plane object points optical orthogonal coordinate orthogonal projection parallax parallel parameters perpendicular perspective centre point groups point H position possible principal distance principal point projective geometry projector radial distortion reconstructed rectification respectively right photograph roentgen rotation rotation of axes scale Schematic shown squares standard error stereoscopic viewing straight lines straight point sequences substituted system x systematic errors termed three-dimensional tion transformation unit weight values X-ray photogrammetry X-ray photographs y-parallaxes