A novel segmentation algorithm based on the region growing paradigm is presented. Unlike previous segmentation methods, this novel scheme requires neither hand-tuning of parameters nor knowledge about the scene. Instead, the parameter which controls the segmentation is dynamically derived from the data for each region, based on a local quality measure of the region's contour. The algorithm assi...

We present here a new algorithm for segmentation of intensity images which is robust, rapid, and free of tuning parameters. The method, however, requires the input of a number of seeds, either individual pixels or regions, which will control the formation of regions into which the image will be segmented. In this correspondence, we present the algorithm, discuss briefly its properties, and sugg...

The best way to support commonsense reasoning over geographic data is via qualitative spatial reasoning over spatial objects and their relations. The Region Connection Calculus (RCC) (Randell et al. 1992) family is one of the well-known logical languages for formalizing topological relationships that describe commonsense spatial knowledge. In this paper, we modify and extend RCC-8 to propose a ...

Background. While flow convergence methods have been promising for calculating volume flows from color Doppler images, it appears that the velocity threshold used and the transorifice pressure gradient dramatically influence the accuracy of application of the simple hemispheric flow convergence equation for calculation of flow rate. The present in vitro study was performed to determine whether ...

The anatomy of the hippocampal region has been studied intensely in rodents since Cajal (1911) and his pupil, Lorente de N6 (1934), carried out their classic slUdies using the Golgi method. In recent years, the cytoarchitecture and connections of the hippocampal region have been further elucidated by the work of Blackstad (1956, 1958), Raisman et al. (1965, 1966) and Hjorth-Simonsen (1972, 1973...

A 42 year old male presented with swelling in the right posterior cervical region for a period of 2 months. Palpation revealed a soft, non tender, mobile swelling measuring 2 x 1 cms. An elective excision biopsy was performed. Gross examination showed a yellow to pale brown soft mass. On microscopy, a well circumscribed tumour composed of two populations of cells(uni-vacuolated white adipocytes...

A polyhedral terrain is the graph of a continuous piecewise linear function defined over the triangles of a triangulation in the xy-plane. Two points on or above a terrain are visible to each other if the line-of-sight does not intersect the space below the terrain. In this paper, we look at three related visibility problems in terrains. Suppose we are given a terrain T with n triangles and two...

Electrical stimulation of fibers of passage through the fastigial nucleus increases arterial pressure. To identify nuclei that may project through the pressor region of the fastigial nucleus, we injected the retrograde tracer fast blue unilaterally at confirmed pressor sites in the nucleus. In seven rats, we found dense fluorescent labeling bilaterally in the external cuneate, lateral reticular...

Satellite observation of Earth's atmosphere in the millimetre and sub-millimetre wavelength region is complementary to those in the visible and infrared spectral region. The emission and opacity of the atmosphere, and scattering by ice particles are all exploited for sensing various layers of the atmosphere in terms of water vapour content, temperature, molecular composition, precipitating wate...

We gave atropine intravenously to autonomically decentralized, open-chest, anesthetized dogs and stimulated the discrete intracardiac sympathetic nerve fibers to the sinoatrial (SA) (SAS stimulation) or atrioventricular (AV) (AVS stimulation) nodal region. A brief burst of neural stimuli was delivered during each cardiac cycle. SAS stimulation consistently decreased the atrial cycle length but ...