scholarly journals Asynchronous Observations of Processes

1998 ◽  
pp. 95-109 ◽  
Author(s):  
Michele Boreale ◽  
Rocco De Nicola ◽  
Rosario Pugliese
Keyword(s):  
Asynchronous Observations

A SEQUENTIAL BAYESIAN ALGORITHM FOR SURVEILLANCE WITH NONOVERLAPPING CAMERAS

2005 ◽  
Vol 19 (08) ◽  
pp. 977-996 ◽  
Author(s):  
WOJCIECH ZAJDEL ◽  
BEN J. A. KRÖSE
Keyword(s):  
Visual Surveillance ◽  
Field Of View ◽  
Office Building ◽  
Model Parameters ◽  
Bayesian Algorithm ◽  
Bayes Network ◽  
Smooth Motion ◽  
Similar Association ◽  
Multiobject Tracking ◽  
Asynchronous Observations

Visual surveillance in wide areas (e.g. airports) relies on sparsely distributed cameras, that is, cameras that observe nonoverlapping scenes. In this setup, multiobject tracking requires reidentification of an object when it leaves one field of view, and later appears at some other. Although similar association problems are common for multiobject tracking scenarios, in the distributed case one has to cope with asynchronous observations and cannot assume smooth motion of the objects. In this paper, we propose a method for human indoor tracking. The method is based on a Dynamic Bayes Network (DBN) as a probabilistic model for the observations. The edges of the network define the correspondences between observations of the same object. Accordingly, we derive an approximate EM-like method for selecting the most likely structure of DBN and learning model parameters. The presented algorithm is tested on a collection of real-world observations gathered by a system of cameras in an office building.

scholarly journals Sequential Monte Carlo methods for multi-sensor tracking with applications to radar systems

2021 ◽  
Author(s):  
Alon Shalev Housfater
Keyword(s):  
Monte Carlo ◽  
Sequential Monte Carlo ◽  
Simulated Data ◽  
Tracking Systems ◽  
Sequential Monte Carlo Methods ◽  
Radar Systems ◽  
Radar Networks ◽  
Initialization Scheme ◽  
And Performance ◽  
Asynchronous Observations

The aim of this thesis is to explore specific sequential Monte Carlo (SMC) methods and their application to the unique demands of radar and bearing only tracking systems. Asynchronous radar networks are of special interest and a novel algorithm, the multiple imputation particle filter (MIPF), is formulated to perform data fusion and estimation using asynchronous observations. Convergence analysis is carried out to show that the algorithm will converge to the optimal filter. Simulations are performed to demonstrate the effectiveness of this filter. Next, the problem of multi-sensor bearing only tracking is tackled. A particle based tracking algorithm is derived and a new filter initialization scheme is introduced for the specific task of multi-sensor bearing only tracking. Simulated data is used to study the efficiency and performance of the initialization scheme.

scholarly journals ELECTROPHYSIOLOGY OF ELECTRIC ORGAN IN GYMNOTUS CARAPO

1959 ◽  
Vol 42 (5) ◽  
pp. 1067-1104 ◽  
Author(s):  
Michael V. L. Bennett ◽  
Harry Grundfest
Keyword(s):  
Short Duration ◽  
Electric Organ ◽  
Nerve Fibers ◽  
Lower Threshold ◽  
The Other ◽  
Normal Organ ◽  
Postsynaptic Potential ◽  
Opposite Face ◽  
Asynchronous Observations

The electric organ of G. carapo is formed by linearly arrayed electroplaques which lie in four tubes on each side of the fish. In one tube the electroplaques are innervated on their rostral surfaces, in the others on the caudal. Both surfaces of each electroplaque produce spikes, and either can be excited alone by a suitably oriented externally applied stimulating current. The innervated surface, however, has a lower threshold, and in the normal organ activity, which is a continuous discharge at 35 to 60/sec., it is always fired first by the large neurally evoked postsynaptic potential. The spike of the innervated face then fires the opposite face. The potential recorded external to the innervated face is initially negative and becomes positive when the other face fires. The potential outside the other face is inverted. The p.s.p.'s are electrically inexcitable, have short duration, and are augmented by hyperpolarization. A single electroplaque is innervated by several nerve fibers, which produce summative p.s.p.'s. Homosynaptic facilitation of p.s.p.'s is common. The synapses are cholinoceptive. The organ discharge begins with synchronized activity in the rostrally innervated electroplaques. After a brief interval, the electroplaques in the other three tubes fire. The organ discharge therefore is triphasic, resulting from the summation of the two diphasic components that are oppositely directed and asynchronous. Observations on the sensory role of the organ are included.

scholarly journals Testing for simultaneous jumps in case of asynchronous observations

Bernoulli ◽  
2018 ◽  
Vol 24 (4B) ◽  
pp. 3522-3567 ◽  
Author(s):  
Ole Martin ◽  
Mathias Vetter
Keyword(s):  
Asynchronous Observations
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