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Perspective matching using the EM algorithm [chapter]

A. D. J. Cross, E. R. Hancock
1997 Lecture Notes in Computer Science  
Modelmatching is realised using a variant of the EM algorithm. This involves coupling the correspondence matching of the Delaunay triangulation to the recovery of the point deformation parameters.  ...  This paper describes a new approach to perspective matching which simultaneously exploits both rigidity-structure and point distribution information.  ...  Rigidity-structure is represented by a Delaunay triangulation [1] over the point sets being matched. We recover the correspondence matches using a variant of the EM algorithm.  ... 
doi:10.1007/3-540-63507-6_226 fatcat:evljz6dinnhvlnhf2g53di6oi4

Recovering Perspective Pose with a Dual Step EM Algorithm

Andrew D. J. Cross, Edwin R. Hancock
1997 Neural Information Processing Systems  
Unification is realised by constructing a mixture model over the bi-partite graph representing the correspondence match and by effecting optimisation using the EM algorithm.  ...  According to our EM framework the probabilities of structural correspondence gate contributions to the expected likelihood function used to estimate maximum likelihood perspective pose parameters.  ...  The EM Algorithm Our aim is to extract perspective pose parameters and correspondences matches from the two point-sets using the EM algorithm.  ... 
dblp:conf/nips/CrossH97 fatcat:hksfc2fljvc4honuea3sejomkm

Graph matching with a dual-step EM algorithm

A.D.J. Cross, E.R. Hancock
1998 IEEE Transactions on Pattern Analysis and Machine Intelligence  
Unification is realized by constructing a mixture model over the bipartite graph representing the correspondence match and by affecting optimization using the EM algorithm.  ...  The first involves the matching of different perspective views of 3.5-inch floppy discs.  ...  Viewed from the perspective of graphical template matching [5] , [26] , our EM algorithm allows an explicit deformational model to be imposed on a set of feature points.  ... 
doi:10.1109/34.730557 fatcat:6lfixjn53feptg2fyu2ugnd3ia

Research on Shape Mapping of 3D Mesh Models based on Hidden Markov Random Field and EM Algorithm [article]

Yong Wang, Huai-yu Wu
2017 arXiv   pre-print
This paper focused on the research on shape mapping of 3D mesh models, and proposed a shape mapping algorithm based on Hidden Markov Random Field and EM algorithm, as introducing a hidden state random  ...  variable associated with the adjacent blocks of shape matching when establishing HMRF.  ...  In this paper, the EM algorithm is used to realize the class label calculation. EM algorithm is an effective method to solve the optimization problem of latent variables.  ... 
arXiv:1707.09123v1 fatcat:ygpyubxlgvdbnlish6jkqmyy34

Robust Factorization Methods Using a Gaussian/Uniform Mixture Model

Andrei Zaharescu, Radu Horaud
2008 International Journal of Computer Vision  
In this paper we address the problem of building a class of robust factorization algorithms that solve for the shape and motion parameters with both affine (weak perspective) and perspective camera models  ...  We introduce a Gaussian/uniform mixture model and its associated EM algorithm. This allows us to address robust parameter estimation within a data clustering approach.  ...  Use the same initialization step as the affine factorization with EM algorithm.  ... 
doi:10.1007/s11263-008-0169-x fatcat:qit4fepbgvdjjpr4tv3ha7zkyi

Structure from Motion using full spherical panoramic cameras

Alain Pagani, Didier Stricker
2011 2011 IEEE International Conference on Computer Vision Workshops (ICCV Workshops)  
In this paper, we investigate the use of full spherical panoramic images for Structure from Motion (SFM) algorithms.  ...  We formulate our method using a spherical imaging model, that covers all central projection cameras, including catadioptric and dioptric systems, as well as the standard projective pinhole camera.  ...  Acknowledgment This work has been partially funded by the project CAPTURE (01IW09001).  ... 
doi:10.1109/iccvw.2011.6130266 dblp:conf/iccvw/PaganiS11 fatcat:z3azzssdozb2fk4ksy6meo2kei

Rigid Point Registration with Expectation Conditional Maximization [article]

Jing Wu
2018 arXiv   pre-print
This paper addresses the issue of matching rigid 3D object points with 2D image points through point registration based on maximum likelihood principle in computer simulated images.  ...  Adopting the Expectation Conditional Maximization for Point Registration (ECMPR), two different rotation and translation optimization algorithms are compared in this paper.  ...  We used variant EM algorithm-E-CM, to maximize the expected complete-data log-likelihood and preserving the convergence properties of EM.  ... 
arXiv:1803.02518v1 fatcat:jmno56jjzrcobgct5ers27igjq

MAP Estimation of Epipolar Geometry by EM Algorithm and Local Diffusion

Wenfeng Li, Baoxin Li
2007 2007 IEEE International Conference on Image Processing  
Using the EM algorithm to maximize a posteriori, our approach updates feature correspondence with estimated epipolar geometry.  ...  While this typically relies on feature point correspondence, the epipolar constraint can also be used for improving the accuracy of correspondence.  ...  This is exactly the prime motivation of using EM algorithm here.  ... 
doi:10.1109/icip.2007.4379800 dblp:conf/icip/LiL07 fatcat:aytqzwp4rba6vefanpxplqgz54

Iterative Procrustes alignment with the EM algorithm

B. Luo, E.R. Hancock
2002 Image and Vision Computing  
This paper casts the problem of point-set alignment via Procrustes analysis into a maximum likelihood framework using the EM algorithm.  ...  The method can be used to match unlabelled point-sets of different size. We illustrate the effectiveness of the method matching stereograms.  ...  Dual step EM algorithm The aim in this paper is to show how the Procrustes alignment of the two point-sets can be realised using the EM algorithm.  ... 
doi:10.1016/s0262-8856(02)00010-0 fatcat:gmyy2ca2ynaizkds54t227jehi

A novel approach for the registration of 2D portal and 3D CT images for treatment setup verification in radiotherapy [chapter]

Ravi Bansal, Lawrence H. Staib, Zhe Chen, Anand Rangarajan, Jonathan Knisely, Ravinder Nath, James S. Duncan
1998 Lecture Notes in Computer Science  
The proposed algorithm can be used, in general, for registering a high resolution image to a low resolution image.  ...  The minimax entropy algorithm proposed in this paper evaluates appropriate entropies in order to segment the portal image and to find the registration parameters iteratively.  ...  Thus, the EM algorithm may be used to estimate both the pose parameters and the segmentation labels. However, there are several problems with the EM approach that restrict its use in this problem.  ... 
doi:10.1007/bfb0056297 fatcat:paulqvego5emporjof7z5hahnq

Creating an Infrastructure for Comparative Effectiveness Research in Emergency Medical Services

Christopher W. Seymour, Jeremy M. Kahn, Christian Martin-Gill, Clifton W. Callaway, Derek C. Angus, Donald M. Yealy, Manish N. Shah
2014 Academic Emergency Medicine  
The use of community stakeholder engagement was included to guide scientific inquiry, as well as 2-year follow up for patient-centered outcomes.  ...  Objectives-Emergency medical services (EMS) providers deliver the initial care for millions of people in the United States each year.  ...  Acknowledgments Funding: This work is supported in part by a grant from the National Institutes of Health (1K23GM104022-01) and the Health Resources and Service Administration (H3AMC24076).  ... 
doi:10.1111/acem.12370 pmid:24842512 pmcid:PMC4030684 fatcat:s6fplf6pyffrtbnk5modfjkbpe

Comparing record linkage software programs and algorithms using real-world data

Alan F. Karr, Matthew T. Taylor, Suzanne L. West, Soko Setoguchi, Tzuyung D. Kou, Tobias Gerhard, Daniel B. Horton, Hua Wang
2019 PLoS ONE  
Exact matching matched record pairs with identical test characteristics (sensitivity 90.48%, specificity 99.78%) for the highest ranked group, but algorithms differentially prioritized certain variables  ...  We linked datasets using first and last name, gender, and date of birth (DOB). We evaluated DOB and year of birth (YOB) as blocking variables and used exact and inexact matching methods.  ...  Acknowledgments We thank James Boyd and Anna Ferrante for access to the Curtin University Probabilistic Linkage Engine (LinXmart) software and for initial discussions regarding the design of our experiments  ... 
doi:10.1371/journal.pone.0221459 pmid:31550255 pmcid:PMC6759179 fatcat:mkjifkicwbasvbntvumgpzxyou

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Frank Dellaert, Steven M. Seitz, Charles E. Thorpe, Sebastian Thrun
2012 Machine Learning  
This paper proposes an EM-based algorithm, which solves the model learning and the data association problem in parallel.  ...  To accommodate the spatial constraints in this domain, we compute virtual measurements as sufficient statistics to be used in the M-step.  ...  We then show how the EM algorithm can be used to learn the model parameters for the case of unknown correspondence.  ... 
doi:10.1023/a:1020245811187 fatcat:ellt7ndpb5eufkr2svbfnp42j4

Structural graph matching using the EM algorithm and singular value decomposition

Bin Luo, E.R. Hancock
2001 IEEE Transactions on Pattern Analysis and Machine Intelligence  
Commencing from a probability distribution for matching errors, we show how the problem of graph matching can be posed as maximum-likelihood estimation using the apparatus of the EM algorithm.  ...  AbstractÐThis paper describes an efficient algorithm for inexact graph matching.  ...  We make two contributions: First, we aim to render the process robust to structural error using the apparatus of the EM algorithm.  ... 
doi:10.1109/34.954602 fatcat:2tmncswvbzantfcbddktuwecgq

A Unified Query-based Generative Model for Question Generation and Question Answering [article]

Linfeng Song, Zhiguo Wang, Wael Hamza
2018 arXiv   pre-print
The encoder takes a passage and a query as input then performs query understanding by matching the query with the passage from multiple per- spectives.  ...  When used as additional training data, the automatically generated questions even improve the performance of a strong ex- tractive QA system.  ...  Here a perspective is a way of matching the query and the passage.  ... 
arXiv:1709.01058v2 fatcat:qvjkygcd7rddxfdwhh2ghotk3e
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