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)
OBJECTIVE To investigate the involvement of alpha adrenergic receptors in hypotension induced by cleistanthin A and cleistanthin B. MATERIALS AND METHODS Cleistanthins A and B were isolated from the leaves of Cleistanthus collinus using a column chromatographic method and purified. Structures were confirmed by spectroscopic analysis. The compounds were(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)
BACKGROUND Cleistanthins A and B are isolated compounds from the leaves of Cleistanthus collinus Roxb (Euphorbiaceae). This plant is poisonous in nature which causes cardiovascular abnormalities such as hypotension, nonspecific ST-T changes and QTc prolongation. The biological activity predictions spectra of the compounds show the presence of(More)
Histone deacetylases (HDACs) are enzymes, which catalyze the removal of acetyl moiety from acetyl-lysine within the histone proteins and promote gene repression and silencing resulting in several types of cancer. HDACs are important therapeutic targets for the treatment of cancer and related diseases. Hydroxamic acid inhibitors show promising results in(More)
Protein Kinase C β-II (PKC β-II) is an important enzyme in the development of diabetic complications like cardiomyopathy, retinopathy, neuropathy, nephropathy and angiopathy. PKC β-II is activated in vascular tissues during diabetic vascular abnormalities. Thus, PKC β-II is considered as a potent drug target and the crystal structure of the kinase domain of(More)