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Proceedings Paper

Shape initialization of 3D objects in videoconference scenes
Author(s): Thomas B. Riegel; Andre Kaup
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Paper Abstract

An ultimate goal for future telecommunication applications is giving the viewer the feeling of being present in the scene, or short 3-D telepresence. One way to achieve a natural 3-D impression is to encode image sequences using 3-D model objects and animate them again by computer graphic means regarding the observers' eye positions. A crucial task within such a system is the estimation of 3-D shape parameters based on range information derived from disparity estimation between two or more cameras. The contribution describes a new approach to create a triangulated irregular net over a given region in a depth map. It attaches more importance to rendering aspects regarding texture mapping than to spatial accuracy. The shape estimation starts with the polygonalization of the region boundary, which describes a curve in 3-D space. After projecting the polygon into the image plane a constrained, quality conforming Delaunay triangulation is executed in the image plane. This forces the triangulation to insert all segments of the projected boundary polygon into the mesh and not to create any triangle exceeding a certain area. Finally the triangles of the net are subdivided recursively further, until an approximation criteria depending on the local curvature of the depth map is reached.

Paper Details

Date Published: 15 May 1997
PDF: 9 pages
Proc. SPIE 3012, Stereoscopic Displays and Virtual Reality Systems IV, (15 May 1997); doi: 10.1117/12.274447
Show Author Affiliations
Thomas B. Riegel, Siemens AG (Germany)
Andre Kaup, Siemens AG (Germany)


Published in SPIE Proceedings Vol. 3012:
Stereoscopic Displays and Virtual Reality Systems IV
Scott S. Fisher; John O. Merritt; Mark T. Bolas, Editor(s)

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