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Abstract
An analysis of the phenomena involved in stereoscopic vision leads to the conclusion • that stereoscopy is based on physiologic processes. A definite distińction should be máde between the natural stereoscopic vision in daily life and the unnatural conditions of observation as for instance under a stereoscope. In the first case, characteristic physiologic factors are in complete harmony, whereas conflicting tendencies appear for cases of unnatural vision. The relative strengths of several disharmonic . factors determine the place of the observed sterE,iomodel. Stereoscopic v1s1on with parallel or diverging visual axes can thus be explained on a physiologic basis. A simple assumption enables us to extend the projection theory for these cases and to reconstruct geometrically the observed stereomodel. All properties of this stereomodel such as horizontal scale, vertical scale, and vertical exaggeration can then be determined for all cases of stereoscopic vision.
References
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