Filters








47 Hits in 8.1 sec

Convergent Iterative Closest-Point Algorithm to Accomodate Anisotropic and Inhomogenous Localization Error

L. Maier-Hein, A. M. Franz, T. R. dos Santos, M. Schmidt, M. Fangerau, H. Meinzer, J. M. Fitzpatrick
2012 IEEE Transactions on Pattern Analysis and Machine Intelligence  
In this paper, we show that this assumption may lead to errors and generalize the ICP such that it can account for anisotropic and inhomogenous localization errors.  ...  Since its introduction in the early 1990s, the Iterative Closest Point (ICP) algorithm has become one of the most well-known methods for geometric alignment of 3D models.  ...  ACKNOWLEDGMENTS The authors would like to thank U. Rietdorf, M. Engel, and A. Seitel (DKFZ) as well as B. Radeleff and C. Sommer (University of Heidelberg) for providing the medical imaging data.  ... 
doi:10.1109/tpami.2011.248 pmid:22184256 fatcat:x6rhbsthzrbddjt6bizi6lbhhq

Sonar image segmentation using an unsupervised hierarchical MRF model

M. Mignotte, C. Collet, P. Perez, P. Bouthemy
2000 IEEE Transactions on Image Processing  
This new method of segmentation, called scale causal multigrid (SCM) algorithm, has been successfully applied to real sonar images and seems to be well suited to the segmentation of very noisy images.  ...  In order to model more precisely the local and global characteristics of image content at different scales, we introduce a hierarchical model involving a pyramidal label field.  ...  The fixed point of this iteration corresponds to the better approximations of and in terms of the mean squares error [13] .  ... 
doi:10.1109/83.847834 pmid:18262959 fatcat:kz3ma6lv2rfedc25qduu2zcnpi

A review on automatic fetal and neonatal brain MRI segmentation

Antonios Makropoulos, Serena J. Counsell, Daniel Rueckert
2018 NeuroImage  
In this paper, we review methods adopted for the perinatal brain and categorise them according to the target population, structures segmented and methodology.  ...  These methods aim to define regions of interest of different granularity: brain, tissue types or more localised structures.  ...  the intensity inhomogeneity (Van Leemput et al., 1999; Ashburner and Friston, 2005) , and prior relaxation to accomodate mis-registrations and pathologies (Shiee et al., 2011) .  ... 
doi:10.1016/j.neuroimage.2017.06.074 pmid:28666878 fatcat:7fbaimevcfc67eqpdi2zx7l5ey

Aspect V1.4.0 [article]

Wolfgang Bangerth, Timo Heister
2016 Zenodo  
ASPECT is a parallel, extendible finite element code to simulate thermal convection in both 2D and 3D models.  ...  Support for anisotropic viscosity. Various fixes to free surface computations: checkpointing, better stabilization, crash fixes. New Chunk Geometry model. New material property averaging options.  ...  the iteration error is smaller than the discretization error.  ... 
doi:10.5281/zenodo.164192 fatcat:glnb22g56zc6felnble3fluw6y

Imaging Transport Resonances in the Quantum Hall Effect

G. A. Steele, R. C. Ashoori, L. N. Pfeiffer, K. W. West
2005 Physical Review Letters  
We use a scanning capacitance probe to image transport in the quantum Hall system.  ...  The images provide a quantitative measure of disorder and suggest resonant tunneling as the primary mechanism for transport across ISs.  ...  After sufficient iteration, the potential converges to the correct solution. The process is monitored by examining the residual error after each iteration.  ... 
doi:10.1103/physrevlett.95.136804 pmid:16197165 fatcat:fizpiqchsbdzxmkyirnlgamde4

Multi-Modal Partial Surface Matching for Intra-Operative Registration

Thiago Ramos Dos Santos
2012
Convergent Iterative Closest-Point Algorithm to Accomodate Anisotropic and Inhomogeneous Localization Error. In: IEEE Trans. Patt. Anal. and Mach. Intel. (TPAMI).  ...  Iterative Closest Point Algorithm with Anisotropic Weighting and its Application to Fine Surface Registration. In: SPIE Med. Img.: Img.  ... 
doi:10.11588/heidok.00013355 fatcat:qhil23g7rfgyno5pu3vwheyxby

Speaker comfort and increase of voice level in lecture rooms

Jonas Brunskog, Anders C. Gade, Gaspar Payà Bellester, Lilian Reig Calbo
2008 Journal of the Acoustical Society of America  
Natural, spontaneous speech often shows extreme reductions of many speech segments, to the point of apparent deletion.  ...  Degree of intensity dip has the strongest effect, with a minimal dip in intensity more likely to be perceived as 'kneel' and a strong dip in intensity more likely to be perceived as 'needle. ' The results  ...  On the other hand, Lanczos iterations surmount these difficulties, and tend to converge faster than the power method, even when the latter works well.  ... 
doi:10.1121/1.2934367 fatcat:xr6gp4ldo5bylnxytx2iumrdmi

Fine‐structure processing, frequency selectivity and speech perception in hearing‐impaired listeners

Olaf Strelcyk, Torsten Dau
2008 Journal of the Acoustical Society of America  
Natural, spontaneous speech often shows extreme reductions of many speech segments, to the point of apparent deletion.  ...  Degree of intensity dip has the strongest effect, with a minimal dip in intensity more likely to be perceived as 'kneel' and a strong dip in intensity more likely to be perceived as 'needle. ' The results  ...  On the other hand, Lanczos iterations surmount these difficulties, and tend to converge faster than the power method, even when the latter works well.  ... 
doi:10.1121/1.2935148 fatcat:nqyyia5pubamnhqgonegghrudm

Kinetic roughening phenomena, stochastic growth, directed polymers and all that. Aspects of multidisciplinary statistical mechanics

Timothy Halpin-Healy, Yi-Cheng Zhang
1995 Physics reports  
This very simple stochastic growth algorithm, trivially implemented on the computer, is iterated repeatedly giving rise to an Eden cluster that is compact, nonfractal in the bulk, but with intriguing surface  ...  of the field soon to be consumed, becomes increasingly rough as random elements, such as local inhomogeneities in the moisture content or density of the wheat, begin to have a large scale cumulative effect  ...  We are indebted to many colleagues and friends who have shared with us their insights, enthusiasm, and offered us help. In particular,  ... 
doi:10.1016/0370-1573(94)00087-j fatcat:kwz2xwvx2zaxdbawslxuq5jij4

Lunar seismology: The internal structure of the Moon

N. R. Goins, A. M. Dainty, M. N. Toksöz
1981 Journal of Geophysical Research  
Furthermore, if any iteration step yields an estimated take-off angle beyond one of the boundaries, the boundary point is re-used. Thus the iteration is bound, and absolutely convergent.  ...  First, we obtain a complete picture of the parameter space, and-can determine the existence of local minima (i.e. local solutions), the shape of the minima valleys, and the radius of convergence to any  ...  Fortunately, the required corrections are very similar for phases of similar geometry, such as the nine peg-leg multiples, and so it is possible to search for several related phases on a single record  ... 
doi:10.1029/jb086ib06p05061 fatcat:hlti5axbzbenvai7y76vg4bxzm

The neural bases of normalising for accented speech: A repetition suppression functional magnetic resonance imaging study

Patti Adank, Peter Hagoort
2008 Journal of the Acoustical Society of America  
Natural, spontaneous speech often shows extreme reductions of many speech segments, to the point of apparent deletion.  ...  Degree of intensity dip has the strongest effect, with a minimal dip in intensity more likely to be perceived as 'kneel' and a strong dip in intensity more likely to be perceived as 'needle. ' The results  ...  On the other hand, Lanczos iterations surmount these difficulties, and tend to converge faster than the power method, even when the latter works well.  ... 
doi:10.1121/1.2934685 fatcat:qqmjcl5gjzcj7kssv2pi6efwti

A parallel unstructured mesh model for simulations of stratified flows

Francesco Cocetta
2021
) non-oscillatory forward-in-time (NFT) solvers for simulating a range of stratified flows past blunt bodies.The numerical model is based on the Multidimensional Positive Definite Advection Transport Algorithm  ...  flows past isolated and closely positioned objects, exploiting the flexibility and adaptivity attributes of the employed meshes.Flow structures induced in flows past spheres and hills are discussed especially  ...  Joanna Szmelter, for her invaluable support, precious guidance, courtesy, and condentiality that always put me in the best position to acquire expertise during these years at Loughborough University.  ... 
doi:10.26174/thesis.lboro.14963646.v1 fatcat:ux4fguf5cndcdgmxbjksnaanrq

Consciousness in Neural Networks?

Edmund T Rolls
1997 Neural Networks  
Freeman Three Centuries of Category Errors in Studies of the Neural Basis of Consciousness and Intentionality [Abstract] [Full text] (PDF 118.1 Kb) Chris Browne, Richard Evans, Nick Sales and Igor Aleksander  ...  The assessment of experiments possible to probe the emergence of perception is then surveyed in terms of these criteria, and those which appear to be most effective are delineated.  ...  Mind, brain and consciousness. New York: Academic Press. . Requests for reprints should be sent to Professor E.  ... 
doi:10.1016/s0893-6080(97)00049-x pmid:12662513 fatcat:q3rt2km7snbmlcbpkw6lfac3gq

Automatic MRI segmentation of the developing neonatal brain

Antonios Makropoulos, Daniel Rueckert, Serena Counsell, David Edwards
2015
This thesis focuses on the development of an accurate segmentation algorithm for the neonatal brain MR images and its application in large cohorts of subjects.  ...  Regional volumetric, surface and diffusion tensor imaging measurements are derived from the early preterm period to term-equivalent age.  ...  The algorithm then iteratively computes the centroid of each cluster and estimates the membership (soft or hard) of the points to the classes according to the distance to the centroids. k-means and FCM  ... 
doi:10.25560/23953 fatcat:pcnw3mnkzzcttii2nzlka2fnpi

CMB-S4 Science Book, First Edition [article]

Kevork N. Abazajian, Peter Adshead, Zeeshan Ahmed, Steven W. Allen, David Alonso, Kam S. Arnold, Carlo Baccigalupi, James G. Bartlett, Nicholas Battaglia, Bradford A. Benson, Colin A. Bischoff, Julian Borrill, Victor Buza (+66 others)
2016 arXiv   pre-print
This book lays out the scientific goals to be addressed by the next-generation ground-based cosmic microwave background experiment, CMB-S4, envisioned to consist of dedicated telescopes at the South Pole  ...  , the high Chilean Atacama plateau and possibly a northern hemisphere site, all equipped with new superconducting cameras.  ...  To fully exploit the lack of limiting primordial signal in the B-mode polarization, maximum likelihood lensing reconstruction algorithms can be used, which use iteration to surpass the quadratic estimator  ... 
arXiv:1610.02743v1 fatcat:4djg7scecfgrfkyp4c6jjojz5q
« Previous Showing results 1 — 15 out of 47 results