Explanipedia

Analysis of the Pulmonary Vascular Tree Using Differential Geometry Based Vector Fields Open

Jim Williams, Lawrence B. Wolff · 1997

We extract topological and local structural information from X-ray-computed tomography (CT) volume images of the vascular tree of the lung. We then produce an abstract model of the topology and geometry of the tree which is suitable for ge…

Polarization vision: a new sensory approach to image understanding Open

Lawrence B. Wolff · 1997

Overviewed are recent results of a new general approach to image understanding and computer vision utilizing the sensing of polarization of light. Whereas human vision is oblivious to components of light polarization, polarization paramete…

Surface Curvature and Shape Reconstruction from Unknown Multiple Illumination and Integrability Open

Joel Fan, Lawrence B. Wolff · 1997

We present a multiple illumination technique that directly recovers the viewer-centered curvature matrix, up to a scalar factor, at each mutually illuminated point on a smooth object surface. This technique is completely independent of kno…

Polarization camera sensors Open

Lawrence B. Wolff, Andreas G. Andreou · 1995

Recently, polarization vision has been shown to simplify some important image understanding tasks that can be more difficult to perform with intensity vision alone. This, together with the more general capabilities of polarization vision f…

Shape From Lambertian Photometric Flow Fields Open

Lawrence B. Wolff · 1989

A new idea for the analysis of shape from reflectance maps is introduced in this paper. It is shown that local surface orientation and curvature constraints can be obtained at points on a smooth surface by computing the instantaneous rate …

Segmentation Of Specular Highlights From Object Surfaces Open

Lawrence B. Wolff · 1989

A major hindrance to image segmentation tasks are the presence of specular highlights on object surfaces. Specular highlights appear on object surfaces where the specular component of reflection from illuminating light sources is so domina…

Classification Of Material Surfaces Using The Polarization Of Specular Highlights Open

Lawrence B. Wolff · 1989

Recently there has been interest, in computer vision research, in the segmentation of images based upon the actual material makeup of the objects or object parts that constitute image regions. The idea is to identify image characteristics …

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