Many applications in computer vision require the 3D reconstruction of a shape from its different views. When the available information in the images is just a binary mask segmenting the object, the problem is called shape from silhouette (SfS). As first proposed by Baumgart [1], the shape is usually computed as the maximum volume consistent with the given set of silhouettes. This is called visu...

Transparency in 3D graphics has traditionally been created by ordering the transparent objects from back-to-front with respect to the viewpoint, and rendering the opaque objects first and then the transparent objects in the prescribed order. This has three major disadvantages: need for splitting intersecting polygons, repeated ordering for varying view points, and finally, incorrect transparenc...

In this work we introduce a new silhouette normalization method, which is robust with respect to deformations and enables the use of image domain based similarity measures for recognition applications. It is shown that a template matching operation can provide an accurate shortlist of candidates suitable for a more exact matching engine in spite of projective transformations and silhouette defo...

We investigate whether polyhedral models suffice for accurate silhouette computation. Therefore, we set up a theoretical framework, a mathematical foundation, to compare various algorithms computing silhouettes on spatial and topological accuracy. Within this carefully constructed environment, we can argue on a formal basis why some silhouette-computing algorithms are better than others. In doi...

This Article discusses the historic course of recent events insofar as it first describes the Maglite decision of the European Free Trade Association Court. Second, it summarizes the opinion of the Advocate General and the judgment of the Court of Justice of the European Communities in the Silhouette case. Part III focuses on the development of the law in the European Union (”EU”) and European ...

B.Bones and breast shadows: Inspect the bones for radiographic density, fractures, lytic lesions, or bony deformity. Eval¬ uate the breast shadows for gross asymmetry, evidence of prior surgery, and any gross calcification. C.Cardiac silhouette: Assess the cardiac silhouette for gen¬ eral size and contour. D.Diaphgram: Assess the diaphgram(s) with attention to the contour and costaphrenic angle...

We present a new approach to combine two approaches to three-dimensional reconstruction: silhouette-based and correspondence-based approaches. The two approaches have complementary costs and benefits. Silhouette-based approaches deliver volumetric descriptions which often have very few outliers, but they cannot reconstruct concave surfaces. Correspondence-based approaches give surface descripti...