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Proceedings Paper

Geometric Constraints For Interpreting Images Of Common Structural Elements: Orthogonal Trihedral Vertices
Author(s): Sidney Liebes
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Paper Abstract

A simple analytical procedure is introduced for utilizing a ubiquitous engineering and architural structural subelement to facilitate automatically cuing, monoscopically inferring surface structure and orientation, and resolving stereo correspondences: orthogonal trihedral vertices, or OTVs. OTVs occur in profusion indoors and out. They are identifiable, and are a rich source of information regarding relative surface conformation and orientation. Practical considerations often constrain OTVs to be vertically aligned. General obligue perspective properties of OTVs are examined. The especially important case of nadir-viewing aerial stereophotogrammetry is developed in detail. An object-space vertex labeling convention incorporates vertex type and orientation. A set of image space junction signature rules based upon the object space invariance of OT V edge vanishing points enables unambiguous vertex label assignment for interior and exterior OTVs. An independent application of the labeling scheme to both members of a stereo pair, taken at arbitrarily wide convergence angle, identically labels corresponding juntions. An illustrative example is presented. Algorithmic implementation has not yet been undertaken.

Paper Details

Date Published: 12 November 1981
PDF: 7 pages
Proc. SPIE 0281, Techniques and Applications of Image Understanding, (12 November 1981); doi: 10.1117/12.965762
Show Author Affiliations
Sidney Liebes, Stanford University (United States)


Published in SPIE Proceedings Vol. 0281:
Techniques and Applications of Image Understanding
James J. Pearson, Editor(s)

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