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Title:
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3D RECONSTRUCTION OF SMALL SOLAR SYSTEM BODIES USING PHOTOCLINOMETRY BY DEFORMATION |
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Author(s):
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Claire Capanna, Laurent Jorda, Philippe Lamy, Gilles Gesquiere |
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ISBN:
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978-972-8939-48-9 |
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Editors:
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Yingcai Xiao |
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Year:
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2011 |
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Edition:
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Single |
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Keywords:
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3D reconstruction, optimization, deformation, synthetic images, photoclinometry |
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Type:
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Full Paper |
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First Page:
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83 |
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Last Page:
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90 |
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Language:
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English |
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Cover:
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Full Contents:
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click to dowload 
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Paper Abstract:
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This article considers the problem of reconstructing the 3D shape model of asteroids and cometary nuclei from images obtained with an imaging system on board a spacecraft. We present a photoclinometry method based on the minimization of the chi-square difference between observed and synthetic images of the object by deformations of its initial shape. The minimization is performed using the so-called limited-memory Broyden-Fletcher-Golbfarb-Shanno algorithm. The deformations can be applied: (i) by modifying the coefficients of a spherical harmonic expansion in order to extract the global shape of the object, and/or (ii) by moving the height of the vertices of a triangular mesh in order to increase the accuracy of the global shape model and/or to derive localized topographic maps of the surface. This method has been tested on images of the asteroids Steins and Lutetia observed by the imaging system on board the Rosetta spacecraft of the European Space Agency. |
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