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Conflagration is one of the major disasters that threatens human life and property. If the proper action is not taken in detecting the symptom of conflagration events ahead of time, the number of such disasters will keep increasing. An effective solution in this context will alleviate many fire-related global problems to a great extent. Although fire detectors are not available in many places, WiFi...
Despite significant progress in pedestrian detection has been made in recent years, detecting pedestrians in crowded scenes remains a challenging problem. In this paper, we propose to use visual contexts based on scale and occlusion cues from detections at proximity to better detect pedestrians for surveillance applications. Specifically, we first apply detectors based on full body and parts to generate...
In the elemental analyzer based on neutron induced prompt gamma-ray analysis, the master program is compiled by C#. It can not only compute the elemental contents of Si, Al, Fe and Ca, but also can control the hardware of the analyzer, such as BGO gamma ray detector, Multi-channel pulse analyzer, neutron detector, and D-D neutron generator. The results indicate that the equipment failure rate caused...
Pedestrian detection is a challenging task for video surveillance. The problem becomes more difficult when occlusion is prevalent. In this paper, we extend a deformable part-based pedestrian detector to pedestrian detection in crowded scenes by considering both body part detection responses and detections' mutual spatial relationship. Specifically, we first decompose the full body detector into several...
This paper presents detectors for signal with harmonics to fully explore the inherent harmonic structure of the signal with unknown fundamental frequency, amplitude and phase in complex white Gaussian noise. For signals with harmonic characteristics, a transformed power spectrum is proposed to find the energy integration of all the harmonic components. We analyze the statistical property of the transformed...
Effective coordination can dramatically reduce radio interference and avoid packet collisions for multi-station wireless local area networks (WLANs). Coordination itself needs consume communication resource and thus competes with data transmission for the limited wireless radio resources. In traditional approaches, control frames and data packets are transmitted in an alternate manner, which brings...
In this paper, we solve the problem of human detection in crowded scenes using a Bayesian 3D model based method. Human candidates are first nominated by a head detector and a foot detector, then optimization is performed to find the best configuration of the candidates and their corresponding shape models. The solution is obtained by decomposing the mutually related candidates into un-occluded ones...
A comparison between the National Institute of Metrology (NIM) and the Beijing Institute of Radio Metrology and Measurement (BIRMM) Programmable Josephson Voltage Standards (PJVS) at 1 V level was carried out at Changping campus of NIM from November 16 to November 17, 2009. The measured difference voltage between the two PJVS is 2×10-10 in direct comparison and 4×10-9 in indirect comparison. The results...
One of the important steps in gradient-based edge detection is thresholding, e.g., hysteresis thresholding in the Canny detector. Traditional approaches only use gradient magnitude as the criterion to select edge pixels. We introduce a novel saliency measure called supporting range. It measures the range along the gradient direction of an edge pixel in which its gradient magnitude is a local maximum...
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