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检索条件"主题词=Expectation-Maximization algorithms"
270 条 记 录,以下是141-150 订阅
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Homography-based image mosaicing for automatically removing partial foreground objects
Homography-based image mosaicing for automatically removing ...
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International Conference on Signal Processing and Communication Systems, ICSPCS
作者: Takeaki Iiyoshi Wataru Mitsuhashi Information and Communication Engineering University of Electro-Communications Tokyo Japan
Image mosaicing is an effective means of constructing a single panoramic image from a series of snapshots taken in different viewing angles. However, in the case of congested traffic scenes with a cluttered environmen... 详细信息
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DWT-CEM: an algorithm for scale-temporal clustering in fMRI
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BIOLOGICAL CYBERNETICS 2007年 第1期97卷 33-45页
作者: Sato, Joao Ricardo Fujita, Andre Amaro, Edson, Jr. Miranda, Janaina Mourao Morettin, Pedro Alberto Brammer, Michal John Univ Sao Paulo Inst Math & Stat BR-05508090 Sao Paulo Brazil Univ Sao Paulo Dept Radiobiochem LIM44 NIF BR-05403001 Sao Paulo Brazil Kings Coll London Inst Psychiat Brain Image Anal Unit London SE5 8AF England
The number of studies using functional magnetic resonance imaging (fMRI) has grown very rapidly since the first description of the technique in the early 1990s. Most published studies have utilized data analysis metho... 详细信息
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Estimation of propagation channel parameters using multi-dimensional hybrid-space SAGE algorithm
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IET MICROWAVES ANTENNAS & PROPAGATION 2007年 第6期1卷 1212-1222页
作者: Tan, C. M. Beach, M. A. BT Grp Plc Chief Architect Off Kuala Lumpur 50470 Malaysia Univ Bristol Ctr Commun Res Bristol BS8 1UB Avon England
To-date, most multipath propagation parameters are estimated in the element-space domain due to implementation simplicity. Although estimation in the beam-space domain can reduce both the dimensionality of the data si... 详细信息
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Penalized probabilistic clustering
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NEURAL COMPUTATION 2007年 第6期19卷 1528-1567页
作者: Lu, Zhengdong Leen, Todd K. Oregan Hlth & Sci Inst Dept Comp Sci & Engn OGI Sch Sci & Engn Beaverton OR 97006 USA
While clustering is usually an unsupervised operation, there are circumstances in which we believe (with varying degrees of certainty) that items A and B should be assigned to the same cluster, while items A and C sho... 详细信息
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State-space models: From the EM algorithm to a gradient approach
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NEURAL COMPUTATION 2007年 第4期19卷 1097-1111页
作者: Olsson, Rasmus Kongsgaard Petersen, Kaare Brandt Lehn-Schioler, Tue Tech Univ Denmark DK-2800 Lyngby Denmark
Slow convergence is observed in the EM algorithm for linear state-space models. We propose to circumvent the problem by applying any off-the-shelf quasi-Newton-type optimizer, which operates on the gradient of the log... 详细信息
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Learning the lie groups of visual invariance
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NEURAL COMPUTATION 2007年 第10期19卷 2665-2693页
作者: Miao, Xu Rao, Rajesh P. N. Univ Washington Dept Comp Sci & Engn Seattle WA 98195 USA
A fundamental problem in biological and machine vision is visual invariance: How are objects perceived to be the same despite transformations such as translations, rotations, and scaling? In this letter, we describe a... 详细信息
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On the strong non-rigidity of certain tight Euclidean designs
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EUROPEAN JOURNAL OF COMBINATORICS 2007年 第6期28卷 1662-1680页
作者: Bannai, Eiichi Bannai, Etsuko Suprijanto, Djoko Kyushu Univ Grad Sch Math Higashi Ku Fukuoka 8128581 Japan Bandung Inst Technol Dept Math Bandung 40133 Indonesia
We study the non-rigidity of Euclidean t-designs, namely we study when Euclidean designs (in particular certain tight Euclidean designs) can be deformed keeping the property of being Euclidean t-designs. We show that ... 详细信息
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Robust Statistics Based expectation-maximization Algorithm for Channel Tracking in OFDM Systems
Robust Statistics Based Expectation-Maximization Algorithm f...
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IEEE International Conference on Communications (ICC)
作者: S. Kalyani K. Giridhar Telecommunication and Computer Networks (TeNeT) Group Department of Electrical Engineering Indian Institute of Technology Madras Chennai India
Decision directed channel tracking (DDCT) at high fade rates in OFDM based systems is addressed in this paper. Existing DDCT algorithms like the expectation-maximization (EM) algorithm (Al-Naffouri et al., 2002) suffe... 详细信息
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Level Set Method for Positron Emission Tomography
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INTERNATIONAL JOURNAL OF BIOMEDICAL IMAGING 2007年 第unknown期2007卷 1-15页
作者: Chan, Tony F. Li, Hongwei Lysaker, Marius Tai, Xue-Cheng Univ Calif Los Angeles Dept Math 405 Hilgard Ave Los Angeles CA 90095 USA Univ Bergen Ctr Integrated Petr Res N-5007 Bergen Norway Simula Res Lab AS Dept Sci Comp N-1325 Lysaker Norway Henan Univ Dept Math & Syst Sci Kaifeng 475001 Peoples R China Univ Bergen Dept Math N-5009 Bergen Norway
In positron emission tomography (PET), a radioactive compound is injected into the body to promote a tissue-dependent emission rate. expectation maximization (EM) reconstruction algorithms are iterative techniques whi... 详细信息
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Robust Face Matching Under Large Occlusions
Robust Face Matching Under Large Occlusions
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International Conference on Image Analysis and Processing
作者: Georgy Gimel'farb Patrice Delmas John Morris Al Shorin Department of Computer Science University of Auckland Auckland New Zealand
Outliers due to occlusions and contrast and offset signal deviations notably hinder recognition and retrieval of facial images. We propose a new maximum likelihood matching score with "soft masking" of outli... 详细信息
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