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In the Saddle: Chasing Fast and Repeatable Features [article]

Javier Aldana-Iuit, Dmytro Mishkin, Ondrej Chum, Jiri Matas
2016 arXiv   pre-print
In comparison with detector with similar speed, the Saddle features show superior matching performance on number of challenging datasets.  ...  Experiments show that the Saddle features are general, evenly spread and appearing in high density in a range of images. The Saddle detector is among the fastest proposed.  ...  Matching coverage In some task, such as structure from motion, good coverage of the image by matched point is crucial for the stability of the geometric models and consequently for the reliability of the  ... 
arXiv:1608.06800v1 fatcat:arh6h6psxfch3bc52kgtr4zicm

Physics design of a saddle coil system for TCV

J.X. Rossel, J.-M. Moret, Y. Martin, G. Pochon
2011 Fusion engineering and design  
A scaling of the SCS parameters with the number of coil turns is presented and the issue of coil heating and cooling is discussed.  ...  The upgrade project for TCV (Tokamakà Configuration Variable) includes the installation of a set of saddle coils, namely the saddle coil system (SCS), located and powered such as to create a helical magnetic  ...  to a full spatial coverage of the vessel by the filaments.  ... 
doi:10.1016/j.fusengdes.2011.05.011 fatcat:553pavuypfaftoycoxqxqpayru

Blur-Countering Keypoint Detection via Eigenvalue Asymmetry

Chao Zhang, Xuequan Lu, Takuya Akashi
2020 IEEE Access  
Large scale of patches with good keypoints can be collected and annotated in the case of unblurred images.  ...  We compare EAS to some competitive methods including TILDE [24] , HarrisZ [46] , SIFT (DoG) [10] , SADDLE [22] and MSER [47] , by evaluating both inlier ratio and coverage ratio [22] , [48] based  ...  MSER and HarrisZ are shown in circle, with the radius as the square root of axes' product of ellipse. TILDE is shown with fixed scale 10.  ... 
doi:10.1109/access.2020.3020561 fatcat:dp5mniqx4rekpktyybzlvvi72a

The medial feature detector: Stable regions from image boundaries

Yannis Avrithis, Konstantinos Rapantzikos
2011 2011 International Conference on Computer Vision  
We achieve state of the art performance in matching and retrieval experiments with reduced memory and computational requirements.  ...  We present a local feature detector that is able to detect regions of arbitrary scale and shape, without scale space construction.  ...  Medial features on mannequin image with σ = 4 and (a) τ = 0.3, (b) τ = 0.7. Figure 8 . 8 (a) Repeatability, (b) matching score, (c) correct matches, and (d) coverage for image 1.  ... 
doi:10.1109/iccv.2011.6126436 dblp:conf/iccv/AvrithisR11 fatcat:i666cem4zbg2znfemgjiywoq4m

Tree-Based Morse Regions: A Topological Approach to Local Feature Detection

Yongchao Xu, Pascal Monasse, Thierry Geraud, Laurent Najman
2014 IEEE Transactions on Image Processing  
TBMR extraction is fast, having the same complexity as MSER. Experimentally, TBMR achieves a repeatability on par with state-of-the-art methods, but obtains a significantly higher number of features.  ...  They correspond to specific nodes on those two trees: (1) to the leaves (extrema) and (2) to the nodes having bifurcation (saddle points).  ...  The authors are also grateful to Pierre Moulon for providing the data and the code for the 3D reconstruction, and to Edwin Carlinet for helping to release the code of TBMR.  ... 
doi:10.1109/tip.2014.2364127 pmid:25373079 fatcat:fphxzaxkwnfe7jevrfvwxgq57q

Computing highly occluded paths on a terrain

Niel Lebeck, Thomas Mølhave, Pankaj K. Agarwal
2013 Proceedings of the 21st ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems - SIGSPATIAL'13  
In this paper we present a model and a fast algorithm for computing highly occluded paths on a terrain.  ...  The repeated visibility map computations necessary for our model is expedited using a fast algorithm for calculating approximate visibility maps that models the decrease in observational fidelity as distance  ...  We show that our visibility map algorithm allows fast visibility map calculations, with a trade-off between approximation fidelity and speed.  ... 
doi:10.1145/2525314.2525363 dblp:conf/gis/LebeckMA13 fatcat:yx34cxdc65gqto6fvoqt2s7ikm

Identification of subglacial lakes using ERS-1 radar altimeter

Jeff K. Ridley, Wyn Cudlip, Seymour W. Laxon
1993 Journal of Glaciology  
Numerous bowl-like features can be seen in the surface topography, and these may be associated with intermediate-sized subglacial lakes.  ...  A search for other large Antarctic lakes in the data is made based on the smoothness and low gradient of the surface.  ...  Doake and others at the British Antarctic Survey, for their helpful comments and contributions.  ... 
doi:10.1017/s002214300001652x fatcat:bdmlv2nlkzg5rauz4djdypwr7m

GLAMpoints: Greedily Learned Accurate Match points [article]

Prune Truong, Stefanos Apostolopoulos, Agata Mosinska, Samuel Stucky, Carlos Ciller, Sandro De Zanet
2020 arXiv   pre-print
Our detector extracts repeatable, stable interest points with a dense coverage, specifically designed to maximize the correct matching in a specific domain, which is in contrast to conventional techniques  ...  In this paper, we apply our method on challenging retinal slitlamp images, for which classical detectors yield unsatisfactory results due to low image quality and insufficient amount of low-level features  ...  They achieved good results on low quality images with an overlapping area greater than 30%, but the method is characterised by low repeatability. Wang et al.  ... 
arXiv:1908.06812v3 fatcat:czio5fdmqrauvedtaxlylrvpuy

Upper-mantle velocities below the Scandinavian Mountains fromP- andS-wave traveltime tomography

Babak Hejrani, Niels Balling, Bo Holm Jacobsen, Richard England
2016 Geophysical Journal International  
further north, where station coverage is more uneven.  ...  An important deviation from this principal pattern is found near the topographic saddle between the Southern and Northern Scandes Mountains.  ...  So, south of the SCANLIPS profile, the ray coverage is good in 3-D, whereas further north, the coverage in 3-D is moderate, except in an inclined zone just under the SCANLIPS2 profile with a very good  ... 
doi:10.1093/gji/ggw370 fatcat:2g57lohrizdsje3llg6n5pwaxe

Faster and Better: A Machine Learning Approach to Corner Detection

E. Rosten, R. Porter, T. Drummond
2010 IEEE Transactions on Pattern Analysis and Machine Intelligence  
Finally, the comparison demonstrates that using machine learning produces significant improvements in repeatability, yielding a detector that is both very fast and very high quality.  ...  Second, we generalize the detector, allowing it to be optimized for repeatability, with little loss of efficiency.  ...  We concur that this a good choice for the number of features since this appears to be roughly where the repeatability curve for DoG features starts to flatten off.  ... 
doi:10.1109/tpami.2008.275 pmid:19926902 fatcat:nyu2oeevxrhlldik4r7nkqnmxq

Detection of coarse-grained unstable states of microscopic/stochastic systems: a timestepper-based iterative protocol [article]

A. C. Tsoumanis, C. I. Siettos
2010 arXiv   pre-print
caricature which is used to simulate the dynamics of buying and selling of a large population of interacting individuals in the presence of mimesis.  ...  Both models exhibit coarse-grained regular turning points which give rise to branches of saddle points.  ...  Acknowledgements: This work was partially supported by the State Scholarships Foundation of Greece (IKY) and the National Technical University of Athens through the Basic Research Program ''Constantine  ... 
arXiv:1010.5119v1 fatcat:5kmeq6t7ozctvdzm5doo54tfua

Coarse bifurcation analysis of kinetic Monte Carlo simulations: A lattice-gas model with lateral interactions

Alexei G. Makeev, Dimitrios Maroudas, Athanassios Z. Panagiotopoulos, Ioannis G. Kevrekidis
2002 Journal of Chemical Physics  
Our illustrative example is a model of a heterogeneous catalytic surface reaction with repulsive adsorbate-adsorbate interactions and fast diffusion.  ...  Through numerical continuation and stability analysis, we construct one-and two-parameter coarse bifurcation diagrams.  ...  However, near the high-CO saddle-node point the iterations did not converge so fast.  ... 
doi:10.1063/1.1512274 fatcat:q7ozmolgrvchbfkepuaw7rhkgm

Structured Optimal Transport [article]

David Alvarez-Melis, Tommi S. Jaakkola, Stefanie Jegelka
2017 arXiv   pre-print
We demonstrate how to leverage the geometry of this new model for fast algorithms, and explore connections and properties.  ...  Illustrative experiments highlight the benefit of the induced structured couplings for tasks in domain adaptation and natural language processing.  ...  This function captures discrete groups if the feature vectors are indicator vectors of groups. Other examples include hierarchical structures and coverage functions.  ... 
arXiv:1712.06199v1 fatcat:uetzhgieibg7tjze4zo6l7xnwe

Adsorption and diffusion of a Cl adatom on the GaAs(001)-c(8×2)ζsurface

Seung Mi Lee, Sung-Hoon Lee, Matthias Scheffler
2004 Physical Review B  
The Cl diffusion is discussed and compared to experimental observations.  ...  From the calculated potential-energy surface, we identify the adsorption sites and diffusion energy barriers of a single Cl adatom.  ...  2 molecule: a single round feature and a oblong feature. 24 We identify this single round feature with the single Cl adatom bound at M 1 site.  ... 
doi:10.1103/physrevb.69.125317 fatcat:u3mezn5uwvegbevscdsvrmtzhi

Study of manufacturing and measurement reproducibility on a laser textured structured surface

Gavin D. MacAulay, Nicola Senin, Claudiu L. Giusca, Richard K. Leach
2016 Measurement (London)  
Such surfaces often consist of localised microscale surface features with predetermined geometries.  ...  The performance of the feature manufacturing process affects the functional performance of the surface, and can be assessed by measurement of the resulting surface features.  ...  Dimples were manufactured via femtosecondpulsed laser texturing with nominally 10 µm depth and 20 % coverage density.  ... 
doi:10.1016/j.measurement.2016.03.042 fatcat:qsndm2vmufctzad5l3l5syj2we
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