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On the Geometrical Accuracy in Incremental Sheet Forming
Minerals, Metals and Materials Series, 2021The industrial application of incremental sheet forming (ISF) still stays behind the expectations due to the low geometrical accuracy of the produced parts as well as the insufficient predictability of the forming result. This is due to the fact that some mechanisms which cause the geometrical deviations are not fully understood.
David Bailly, Marvin Laugwitz
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Geometric Accuracy Evaluation of GF-7 Image
2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS, 2021We selected a scene of “GF-7” satellite multispectral rear-view camera image in Chengdu, Sichuan Province of China. At the same time, we take 26 high-precision GPS sampling points evenly distributed in the region as control points, and make statistics on the geometric positioning accuracy of images.
Guoming Li, Guoqing Li, Tianqing Wang
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The question of accuracy with geometric camera calibration
2009 Canadian Conference on Electrical and Computer Engineering, 2009In the field of machine vision, camera calibration refers to the experimental determination of a set of parameters which describe the image formation process for a given analytical model of the machine vision system. An accurate, reliable calibration procedure is essential for most industrial machine vision applications including mechanical metrology ...
Puthukkudichalil Swapna +2 more
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The accuracy of geometric approximation of the mammilla in mammograms
International Congress Series, 2003Abstract The mammilla is an important landmark when judging mammograms. A method of finding the mammilla used by radiologists and within computer-aided mammography is based on the geometrical assumption that the mammilla is located at the point on the breast border that has the furthest distance perpendicular to the pectoralis muscle. This assumption
Fredrik Georgsson, Christina Olsén
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Geometric Accuracy of Intravascular Ultrasound Imaging
Journal of the American Society of Echocardiography, 1992In spite of the current interest in and clinical application of intravascular ultrasound imaging, there is very little published information on the limitations of this modality. In vitro studies on nine phantom vessels (diameter 4.76 to 12.7 mm) and 11 human arteries (diameter 3.7 to 6.2 mm) were performed to assess the potential sources of error of ...
J S, Chae +3 more
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Accuracy of Geometric Channel-Modeling Methods
IEEE Transactions on Vehicular Technology, 2004When constructing a propagation channel model, a substitute is often created by giving an arbitrary shape or form to scatterer distributions based on its intuitive appeal for a certain radio environment. However, such models do not necessarily represent the actual propagation process and may yield inaccurate results. The main objective of this paper is
Yifan Chen, Vimal K. Dubey
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Accuracy of Geometric Estimation
2016We focus here on algebraic methods for ellipse fitting, fundamental matrix computation, and homography computation described in Chaps. 2, 3, and 6 in a more generalized mathematical framework. We do a detailed error analysis in general terms and derive explicit expressions for the covariance and bias of the solution. The hyper-renormalization procedure
Kenichi Kanatani +2 more
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A geometric approach to subpixel registration accuracy
Computer Vision, Graphics, and Image Processing, 1987A method for estimating the translation offset between a pair of images to subpixel accuracy is described and analyzed. This method assumes the extraction of a digital edge representing a straight line in the image and then computes the best real line which could have given rise to the digital line.
Carlos Alberto Berenstein +3 more
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Geometric Accuracy of Three-Dimensional Molecular Overlays
Journal of Chemical Information and Modeling, 2006This study examines the dependence of molecular alignment accuracy on a variety of factors including the choice of molecular template, alignment method, conformational flexibility, and type of protein target. We used eight test systems for which X-ray data on 145 ligand-protein complexes were available.
Qi Chen, Richard E. Higgs, Michal Vieth
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Geometric Accuracy of Ikonos: Zoom In
IEEE Transactions on Geoscience and Remote Sensing, 2004Pioneering in the world, the high-resolution satellite Ikonos imagery has revolutionary changed the market - users now have the unique opportunity to get satellite images with spatial resolution comparable to middle-scale aerial photos. In our study, we tried to find an answer why such images, having submetre spatial resolution, still contain ...
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