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Fast and Accurate Intrinsic Symmetry Detection [article]

Rajendra Nagar, Shanmuganathan Raman
2018 arXiv   pre-print
In this work, we detect the intrinsic reflective symmetry in triangle meshes where we have to find the intrinsically symmetric point for each point of the shape.  ...  In computer vision and graphics, various types of symmetries are extensively studied since symmetry present in objects is a fundamental cue for understanding the shape and the structure of objects.  ...  Conclusions We have presented a fast and an accurate algorithm for detecting intrinsic symmetry in triangle meshes.  ... 
arXiv:1807.10162v3 fatcat:davd7oiei5auleqpcq2trzgefa

Fast Radial and Bilateral Symmetry Detection Using Inverted Gradient Hash Maps

R. Gonzalez, L. Lincoln
2017 EAI Endorsed Transactions on Context-aware Systems and Applications  
This paper presents a fast and novel algorithm for both radial and bilateral symmetry detection based on inverted gradient hash maps (IGHMs).  ...  The method is described and experimentally evaluated against existing methods for both radial and bilateral symmetry detection.  ...  Section 3.2 presents the results of radial symmetry detection and contrasts this with the performance Loy's fast radial symmetry transform.  ... 
doi:10.4108/eai.6-3-2017.152336 fatcat:4qrxr6bftfb4vix2c6sknkkbgy

Affine-invariant geodesic geometry of deformable 3D shapes [article]

Dan Raviv, Alexander M. Bronstein, Michael M. Bronstein, Ron Kimmel, Nir Sochen
2010 arXiv   pre-print
Applications of the proposed framework demonstrate its invariance, efficiency, and accuracy in shape analysis.  ...  The new definition of a metric is used to extend the fast marching method technique for computing geodesic distances on surfaces, where now, the distances are defined with respect to an affine invariant  ...  Intrinsic symmetry Raviv et al.  ... 
arXiv:1012.5936v1 fatcat:5b2gmepogbbxvj3eu75zdq42tu

Efficient view-based 3d reflection symmetry detection

Bo Li, Henry Johan, Yuxiang Ye, Yijuan Lu
2014 SIGGRAPH Asia 2014 Creative Shape Modeling and Design on - SIGGRAPH ASIA '14  
To avoid the high computational load resulting from a directly combinatorial matching among the sample views, we develop a fast symmetry plane detection method by first generating a candidate symmetry  ...  Figure 1 : An overview of our view-based symmetry detection algorithm: an example of an ant model, its viewpoint entropy distribution, and the detected symmetry plane by matching the viewpoints.  ...  Acknowledgments The work of Bo Li, Yuxiang Ye and Yijuan Lu is supported by the Texas State University Research Enhancement Program (REP), Army Research Office grant W911NF-12-1-0057, and NSF CRI 1305302  ... 
doi:10.1145/2669043.2669045 dblp:conf/siggraph/0013JYL14 fatcat:67gc67zjhnf5dmo7vwmwdwuoum

Affine-invariant geodesic geometry of deformable 3D shapes

Dan Raviv, Alexander M. Bronstein, Michael M. Bronstein, Ron Kimmel, Nir Sochen
2011 Computers & graphics  
Applications of the proposed framework demonstrate its invariance, efficiency, and accuracy in shape analysis.  ...  The new definition of a metric is used to extend the fast marching method technique for computing geodesic distances on surfaces, where now, the distances are defined with respect to an affine invariant  ...  shape descriptors, find non-rigid correspondence between shapes, and detect intrinsic symmetry.  ... 
doi:10.1016/j.cag.2011.03.030 fatcat:xw4fzru5arg7tbrsuzcer7hv4q

An accurate and portable solid state neutron rem meter

T.M. Oakes, S.L. Bellinger, W.H. Miller, E.R. Myers, R.G. Fronk, B.W Cooper, T.J. Sobering, P.R. Scott, P. Ugorowski, D.S McGregor, J.K. Shultis, A.N. Caruso
2013 Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment  
The use of multiple detectors and moderator arranged along an axis of symmetry (e.g., 22  ...  This paper 16 presents the design of a portable, high intrinsic efficiency, and accurate neutron rem meter whose 17 energy-dependent response is electronically adjusted to a chosen neutron dose equivalent  ...  moderator to avoid detecting epithermal and 192 fast neutrons from the sides or back (i.e. a camera geometry).  ... 
doi:10.1016/j.nima.2013.03.060 fatcat:xrsaq4dowbdexcapn75o4mj6u4

APPROXIMATELY ISOMETRIC SHAPE CORRESPONDENCE BY MATCHING POINTWISE SPECTRAL FEATURES AND GLOBAL GEODESIC STRUCTURES

ANASTASIA DUBROVINA, RON KIMMEL
2011 Advances in Adaptive Data Analysis  
Further, the paper explores the correspondence ambiguity problem arising when matching intrinsically symmetric shapes using only intrinsic surface properties.  ...  It utilizes both pointwise surface descriptors, and metric structures defined on the shapes to perform the matching task, which is formulated as a quadratic minimization problem.  ...  Alexander and Michael Bronstein for helpful discussions. This research was supported by the USA Office of Naval Research (ONR) grant.  ... 
doi:10.1142/s1793536911000829 fatcat:ufir4l3oerdlfj3l3hgzdf6rem

Segmentation Based Features for Wide-Baseline Multi-view Reconstruction

Armin Mustafa, Hansung Kim, Evren Imre, Adrian Hilton
2015 2015 International Conference on 3D Vision  
Segmentation-based feature detection locates features at local maxima giving a relatively large number of feature points which are consistently detected across wide-baseline views and accurately localised  ...  A common problem in wide-baseline stereo is the sparse and non-uniform distribution of correspondences when using conventional detectors such as SIFT, SURF, FAST and MSER.  ...  performed after the ratio and symmetry tests.  ... 
doi:10.1109/3dv.2015.39 dblp:conf/3dim/MustafaKIH15 fatcat:vqwrxvlwzzhbroag3tcif3n2ku

Fast iterative reconstruction for helical pinhole SPECT imaging

Po-Chia Huang, Ching-Han Hsu, Feng Liu, Dong-Hoon Lee, Ricardo Lagoa, Sandeep Kumar
2015 Bio-medical materials and engineering  
We suggest a novel voxel-driven (VD) system model which can be integrated with geometric symmetries from helical trajectory for fast iterative image reconstruction.  ...  Due to the independence among various symmetries, it permits parallel coding to further boost computation efficiency of forward/backward projection.  ...  This approach can generate a accurate matrix and it also contains all intrinsic characteristics of scanner, such as detector efficiency.  ... 
doi:10.3233/bme-151435 pmid:26405898 fatcat:tyh5qg6qmjahjfbuwv2nrm7w3y

Second harmonic spectroscopy to optically detect valley polarization in 2D materials

F Hipolito, Vitor M Pereira
2017 2D Materials  
disentangling and individually quantifying the intrinsic and valley contributions to the SH.  ...  Whereas in systems such as MoS_2 or BN this adds to their intrinsic quadratic response, SH generation in a multi-valley inversion-symmetric crystal can provide a direct measure of valley polarization.  ...  symmetry, which immediately suggests the detection of this valley-induced SHG response as a direct optical probe of VP.  ... 
doi:10.1088/2053-1583/aa6f4d fatcat:ypkimbei6nbrbk3ykdus5eyime

Fast and Accurate 3D Face Recognition

Luuk Spreeuwers
2011 International Journal of Computer Vision  
The intrinsic coordinate system is defined by the vertical symmetry plane through the nose, the tip of the nose and the slope of the bridge of the nose.  ...  In this paper we present a new robust approach for 3D face registration to an intrinsic coordinate system of the face.  ...  the original author(s) and source are credited.  ... 
doi:10.1007/s11263-011-0426-2 fatcat:ackjr22ykzdwbp6xtdikk2rs24

Optimal Denoising and Feature Extraction Methods Using Modified CEEMD Combined with Duffing System and Their Applications in Fault Line Selection of Non-Solid-Earthed Network

Sizu Hou, Wei Guo
2020 Symmetry  
The trisection symmetry phase estimation is used to determine the relative phase of the detection signal.  ...  Here, based on generalized composite multiscale permutation entropy (GCMPE) and support vector machine (SVM) for signal randomness detection, the complementary ensemble empirical mode decomposition is  ...  The detection process of trisection symmetry phase estimation (TSPE). 3 φFigure 10 . 310 Figure 10. The detection process of trisection symmetry phase estimation (TSPE). Figure 11 . 11 Figure 11.  ... 
doi:10.3390/sym12040536 fatcat:cdcltscnlnek5ml5fvhoqczqzy

A Modified Hilbert Analysis Method to Improve Voice Stress Analysis Systems

Waleed El, Ashraf Mohamed, Hatem M.
2019 International Journal of Computer Applications  
interpolation technique or the conventional Hilbert analysis method and that can speed up the processing time and gives accurate results.  ...  modifies the conventional Hilbert analysis method and combines it with the fast Fourier transform algorithm to overcome the previous limitations of using individually the FTT algorithm, the cubic spline  ...  Conventional stress detection methods include Fast Fourier Transform (FFT) or McQuiston-Ford algorithm.  ... 
doi:10.5120/ijca2019918886 fatcat:ed4epd3zrfhdtilrj6dnuk5d6a

A probabilistic framework for partial intrinsic symmetries in geometric data

Ruxandra Lasowski, Art Tevs, Hans-Peter Seidel, Michael Wand
2009 2009 IEEE 12th International Conference on Computer Vision  
In this paper, we present a novel algorithm for partial intrinsic symmetry detection in 3D geometry.  ...  We apply our algorithm on several standard 3D models, demonstrating that a concise probabilistic model yields a practical and general symmetry detection algorithm.  ...  In our particular formulation, the algorithm is, unlike all previous techniques, able to detect intrinsic partial symmetries.  ... 
doi:10.1109/iccv.2009.5459356 dblp:conf/iccv/LasowskiTSW09 fatcat:kicguwr42jd75jb3sthv2heutq

MapTree: Recovering Multiple Solutions in the Space of Maps [article]

Jing Ren, Simone Melzi, Maks Ovsjanikov, Peter Wonka
2020 arXiv   pre-print
In addition, we demonstrate through extensive experiments that our method is robust and results in more accurate correspondences than state-of-the-art for shape matching and symmetry detection.  ...  This allows us to analyze the full space of maps and extract multiple diverse and accurate solutions, rather than optimizing for a single optimal correspondence as done in most previous approaches.  ...  CRG-2017-3426, and the ERC Starting Grant No. 758800 (EXPROTEA).  ... 
arXiv:2006.02532v2 fatcat:t6esygw4bbfijhlpaxs7kxw6je
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