B. Vijayakumar

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To recognize three-dimensional objects bounded by smooth curved surfaces from monocular image contours, viewpoint-dependent image features must be related to object geometry. Contour bitangents and innections along with associated parallel tangents points are the projection of surface points that lie on the occluding contour for a ve-parameter family of(More)
We represent arbitrary smooth curved 3D shapes by a discrete set of HOT curves where a surface admits High Order Tangents. These curves determine the structure of the image contours and its catastrophic changes, and there is a natural correspondence between some of them and monocular contour features such as in-ections and bitangents. We present a method(More)
The silhouette of a smooth 3D object observed by a moving camera changes over time. Past work has shown how surface geometry can be recovered using the deformation of the silhouette when the camera motion is known. This paper addresses the problem of estimating both the full Euclidean surface structure and the camera motion from a dense set of silhouettes(More)
A b s t r a c t. This paper presents viewpoint-dependent constraints that relate image features such as t-junctions and inflections to the pose of curved 3D objects. These constraints can be used to recognize and locate object instances in the imperfect line-drawing obtained by edge detection from a single image. For objects modelled by implicit algebraic(More)
Recently, a novel shape r epresentation of general curved objects, which is suitable for object recognition, has been proposedd it is based on a set of surface curves, named HOT curves, deened b y t h e l o cus of points where a line has high order tangency with the surface e 1 6 ]. These curves determine the structure o f a n o b j e ct's image contours(More)
Tuberculous brain abscess and subdural empyema are extremely rare manifestations of central nervous system tuberculosis. Here, we report a case of an 11-year-old immunocompetent child who developed temporal lobe abscess and subdural empyema following chronic otitis media. A right temporal craniotomy was performed and the abscess was excised. The Ziehl(More)
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