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Segmenting Salient Objects in 3D Point Clouds of Indoor Scenes Using Geodesic Distances

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Journal of Signal and Information Processing 2013年第3期4卷 102-108页

作者： Shashank Bhatia stephan K. chalup School of Electrical Engineering and Computer Science The University of Newcastle Callaghan 2308 NSW Australia.

Visual attention mechanisms allow humans to extract relevant and important information from raw input percepts. Many applications in robotics and computer vision have modeled human visual attention mechanisms using a bottom-up data centric approach. In contrast, recent studies in cognitive science highlight advantages of a top-down approach to the attention mechanisms, especially in applications involving goal-directed search. In this paper, we propose a top-down approach for extracting salient objects/regions of space. The top-down methodology first isolates different objects in an unorganized point cloud, and compares each object for uniqueness. A measure of saliency using the properties of geodesic distance on the object’s surface is defined. Our method works on 3D point cloud data, and identifies salient objects of high curvature and unique silhouette. These being the most unique features of a scene, are robust to clutter, occlusions and view point changes. We provide the details of the proposed method and initial experimental results.

关键词： Saliency Detection 3D Image Analysis Image Segmentation

Thirtieth Anniversary ofChina-Bolivia Diplomatic Relations:A Broader Diplomatic Agenda

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China Today 2015年第7期64卷 46-48页

作者： GUILLERMO JORGE chalup LIENDO 不详

SINCE China and Bolivia established diplomatic relations 30 years ago,bilateral relations have developed *** of both countries have maintained frequent contacts,and mutual trust steadily *** President of Bolivia,Juan Evo Morales Ayma,has visited China on five occasions:the first was in 2006before he took up office,when he held talks with then Chinese President,Hu Jintao.

关键词： INTERNATIONAL relations ANNIVERSARIES BOLIVIA -- Foreign relations CHINA -- Foreign relations

Thoracic Unilateral Spinal Cord Syndrome Following Neuraxial Anaesthesia for Periprosthetic Knee Fracture: A Case Report

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Open Journal of Anesthesiology 2019年第11期9卷 197-202页

作者： Nahir chalup Torija Á lvaro Ramiro Ruiz Rubén Rodriguez Salas Beatriz Fuentes Benito Marina Nevado Villafruela Manuel Cortés Guerrero Anaesthesia Critical Care Department and Pain Medicine Hospital Universitario 12 de Octubre Madrid Spain Hospital Universitario Fundación Alcorcón Alcorcón Spain Centro de Salud de Torrelodones Áreanoroeste Torrelodones Spain

Neuraxial anaesthesia is widely used in surgical procedures;overall, epidural and intrathecal techniques. Nevertheless, several outcomes should be considered. The incidence of neurologic complications after neuraxial anaesthesia is not perfectly clear (0% - 0.08%), although there are several described cases of spinal cord ischemia. We present a case of thoracic unilateral spinal cord syndrome following lumbar spinal anaesthesia for periprosthetic knee fracture. Our patient suffered monoparesis in her left lower limb as well as decreasing of muscle strength and loss of tendon reflexes. The MNR showed left hyperintense intra-cord images from T7 to T12 attributed to spinal cord oedema and a lineal hypointensity related to minimal haematic component. What made this case surprising was the fact that spinal anaesthesia was performed between L3 and L4 and the patient did not suffer paraesthesia associated with local anaesthetic injection. She was treated with glucocorticoids, gabapentin and amitriptyline. She also was checked by physical rehabilitators, neurologists and Pain Unit physicians. We have found another case reported in the literature about thoracic cord injury after lumbar spinal puncture. In this paper, we report possible aetiologies according to a review and neurological evolution of the patient seven months later.

关键词： Neuraxial Anaesthesia Regional Anaesthesia Neurologic Complications Spinal Cord Injury

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