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A Parameterless Line Segment and Elliptical Arc Detector with Enhanced Ellipse Fitting [chapter]

Viorica Pătrăucean, Pierre Gurdjos, Rafael Grompone von Gioi
2012 Lecture Notes in Computer Science  
We propose a combined line segment and elliptical arc detector, which formally guarantees the control of the number of false positives and requires no parameter tuning.  ...  The accuracy of the detected elliptical features is improved by using a novel non-iterative ellipse fitting technique, which merges the algebraic distance with the gradient orientation.  ...  Conclusion We proposed a parameterless line segment and elliptical arc detector, grounded on the a contrario approach, which controls the number of false positives.  ... 
doi:10.1007/978-3-642-33709-3_41 fatcat:oolpt5stynes5lywaidfr5ac3a

A fast and robust ellipse detector based on top-down least-square fitting

Yongtao Wang, Zheqi He, Xicheng Liu, Zhi Tang, Luyuan Li
2015 Procedings of the British Machine Vision Conference 2015  
The existing algorithms such as [4] often use a bottom-up strategy to combine edge points or elliptical arcs into ellipses, which limits their robustness.  ...  In this paper, we propose a novel algorithm which can efficiently and accurately detect ellipses in digital images with a novel top-down scheme.  ...  A parameterless line segment and elliptical arc detector with enhanced ellipse fitting. In Computer Vision-ECCV 2012, pages 572-585. Springer, 2012. [5] Paul Viola and Michael J Jones.  ... 
doi:10.5244/c.29.156 dblp:conf/bmvc/WangHLTL15 fatcat:dqtoyg7gojc3ri4baaygiwubwu

Video summarization using line segments, angles and conic parts

Md Musfequs Salehin, Manoranjan Paul, Muhammad Ashad Kabir, Yeng-Tseng Wang
2017 PLoS ONE  
In this paper, a novel method is proposed for video summarization using geometric primitives such as conic parts, line segments and angles.  ...  Moreover, to represent objects, geometric primitives (such as lines, arcs) are distinguishable and high level shape descriptors than edges.  ...  On the other hand, the elliptical arc does not fit perfectly with a parabolic or a hyperbolic curve.  ... 
doi:10.1371/journal.pone.0181636 pmid:29121055 pmcid:PMC5679528 fatcat:b4ddr43mlbdnxpcvgdleohwy2q

Automated exterior inspection of an aircraft with a pan-tilt-zoom camera mounted on a mobile robot

Igor Jovancevic, Stanislas Larnier, Jean-José Orteu, Thierry Sentenac
2015 Journal of Electronic Imaging (JEI)  
This paper deals with an automated preflight aircraft inspection using a pan-tilt-zoom camera mounted on a mobile robot moving autonomously around the aircraft.  ...  It is based on the detection of regular shapes, such as rounded corner rectangles, circles, and ellipses.  ...  The partners of the AIR-COBOT project (AKKA TECHNOLOGIES, Airbus Group, ARMINES, 2MoRO Solutions, M3 SYSTEMS and STERELA) are also gratefully acknowledged for their support.  ... 
doi:10.1117/1.jei.24.6.061110 fatcat:mp35b6t4ajak3npesiiqhqfp64

Relative Pose Determination of Uncooperative Spacecraft Based on Circle Feature

Yue Liu, Shijie Zhang, Xiangtian Zhao
2021 Sensors  
The serving spacecraft is equipped with a Time-of-Flight (ToF) camera for object recognition and feature detection.  ...  Secondly, a new parameter fitting method of circle features is proposed including circle feature calculation by two different geometric models and results' fusion.  ...  A parameterless line segment and elliptical arc detector with enhanced ellipse fitting.  ... 
doi:10.3390/s21248495 pmid:34960586 pmcid:PMC8708270 fatcat:f2ldogyv4bf2rjgiping3d2gfe

Fractal Dimension Invariant Filtering and Its CNN-based Implementation [article]

Hongteng Xu and Junchi Yan and Nils Persson and Weiyao Lin and Hongyuan Zha
2017 arXiv   pre-print
Meanwhile, we show that the FDIF method can be re-instantiated approximately via a CNN-based architecture, where the convolution layer extracts anisotropic structure of image and the nonlinear layer enhances  ...  The proposed filtering method provides us with a novel geometric interpretation of CNN-based image model.  ...  Gurdjos, and R. G. Von Gioi. A parameterless line segment and elliptical arc detector with enhanced ellipse fitting. In ECCV. 2012. 3, 7, 10, 11, 12 [29] A. P. Pentland.  ... 
arXiv:1603.06036v3 fatcat:v5xwqbggmfduragglt33whjilq

On fatigue life under stationary Gaussian random loads

Ramesh Talreja
1973 Engineering Fracture Mechanics  
The data can be fitted in two ways: (1) a model with minimum number of degrees of freedom, but with time-varying "characteristic filters" (Coker and Fujimura, J. Aconst. Soc.  ...  pressure change with normally fitting earphones; (3) an inverse relationship between blood flow at the earlobe and pressure change within the meatus.  ...  This technique is used to determine the fundamental frequency of the following: (1) Elliptical ring membrane with the inner and outer ellipses being confocal; EE9.  ... 
doi:10.1016/0013-7944(73)90064-7 fatcat:eue2d6byvre4zczgb7qi5np5vi

On Fatigue Life Under Stationary Gaussian Random Loads

R. Talreja
1973 Journal of the Acoustical Society of America  
The data can be fitted in two ways: (1) a model with minimum number of degrees of freedom, but with time-varying "characteristic filters" (Coker and Fujimura, J. Aconst. Soc.  ...  pressure change with normally fitting earphones; (3) an inverse relationship between blood flow at the earlobe and pressure change within the meatus.  ...  This technique is used to determine the fundamental frequency of the following: (1) Elliptical ring membrane with the inner and outer ellipses being confocal; EE9.  ... 
doi:10.1121/1.1982256 fatcat:w7xnxse54nerdlhsueme325zem

Derivation of Trace Gas Information combining Differential Optical Absorption Spectroscopy with Radiative Transfer Modelling

Christoph Von Friedeburg
2003
Validation 75 7.1 Zenith-sky NO2 and BrO with diurnal variation 75 7.2 Off-Axis HCHO 7.3 Off-Axis NO 2 78 81  ...  Abstract Derivation of Trace Gas Information combining Differential Optical Absorption Spectroscopy with Radiative Transfer Modelling 65 6.6.2 Path points 67 6.6.3 Raytracer 67 6.6.4 Result calculation  ...  A model runs begins with launching a photon out of the detector and into the cone defined by the detector line of sight and the half aperture angle selected.  ... 
doi:10.11588/heidok.00003758 fatcat:ij2sr7avljhu3ot6zu45vj3eze

Synthesis of Carbon Nanotubes on Carbon Fibre for Hierarchical Composites

Wojciech Szmyt
2020
We showed a correlation between the improvements in the catalyst coating quality with the enhanced CNT growth uniformity, density and alignment.  ...  A modified ALD process was proposed, including an ozone treatment for enhancement of covalent bonding between the fibre and the alumina film.  ...  As it turns out, the type and morphology of the supporting alumina play a critical role in the process. Amama et al.  ... 
doi:10.5451/unibas-ep81219 fatcat:6vhswgtu65ebvacaek5wflt65q