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公开(公告)号：US11526980B2
公开(公告)日：2022-12-13
申请号：US16771415
申请日：2018-12-07
申请人： Electricite de France , Centre National de la Recherche Scientifique (CNRS) , Ecole Normale Superieure De Cachan
发明人： Félix Latourte , Qiwei Shi , François Hild , Stéphane Roux
IPC分类号： G06T5/00 , G06T7/00 , G01N23/203 , G01N23/2251 , G06T5/50
摘要： The invention relates to a method for processing images obtained by a diffraction detector, of a crystalline or polycrystalline material, in which a first image of the material is acquired in a state of reference as well as a second image of the material in a deformed state. The invention is characterised in that, in a calculator, during a first step (E6, E12), a current elastic deformation gradient tensor Fe is given a value determined by calculation, during a second step (E7), the current displacement field induced by the tensor Fe is calculated, during a third step (E8), third digital values of a deformed image {hacek over (g)}(x)=g(x+u(x)) corrected by the current displacement field are calculated, and during an iterative algorithm, iterations of the second and third steps (E12, E7, E8) are carried out on modified values of the tensor r Fe until a convergence criterion is met in relation to the correction to the current value of Fe.
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2.发明申请公开(公告)号：US20200349690A1
公开(公告)日：2020-11-05
申请号：US16771415
申请日：2018-12-07
申请人： Electricite de France , Centre National de la Recherche Scientifique (CNRS) , Ecole Normale Superieure De Cachan
发明人： Félix Latourte , Qiwei Shi , François Hild , Stéphane Roux
IPC分类号： G06T7/00 , G06T5/50 , G06T5/00 , G01N23/2251 , G01N23/203
摘要： The invention relates to a method for processing images obtained by a diffraction detector, of a crystalline or polycrystalline material, in which a first image of the material is acquired in a state of reference as well as a second image of the material in a deformed state. The invention is characterised in that, in a calculator, during a first step (E6, E12), a current elastic deformation gradient tensor Fe is given a value determined by calculation, during a second step (E7), the current displacement field induced by the tensor Fe is calculated, during a third step (E8), third digital values of a deformed image {hacek over (g)}(x)=g(x+u(x)) corrected by the current displacement field are calculated, and during an iterative algorithm, iterations of the second and third steps (E12, E7, E8) are carried out on modified values of the tensor r Fe until a convergence criterion is met in relation to the correction to the current value of Fe.
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公开(公告)号：US11215446B2
公开(公告)日：2022-01-04
申请号：US16976425
申请日：2018-02-28
发明人： François Hild , Hugo Leclerc , Stéphane Roux
摘要： A computer-implemented method for identifying mechanical parameters of an object subjected to mechanical stress is provided. The method comprises a step of acquiring, by an imaging means, images of the object taken before and during the application of the mechanical stress, three steps of calculating the effects due to the stress carried out either on the basis of the modeling of the recorded images or on the basis of a theoretical mechanical modeling of the stress, a step of defining a functional equal to the difference between the two models and a last step of minimizing said functional so that the experimental model is as close as possible to the theoretical mechanical model. Additional measurements make it possible to refine the method.
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公开(公告)号：US09733071B2
公开(公告)日：2017-08-15
申请号：US14404918
申请日：2013-05-24
发明人： François Hild , Stéphane Roux
IPC分类号： G01B11/245 , G06T7/80 , G06T7/593
CPC分类号： G01B11/245 , G06T7/593 , G06T7/85
摘要： In the field of methods of three-dimensional measurement of an object by stereo-correlation, methods require at least two cameras connected to image processing means. These methods include at least a first step of calibration of the two image planes and a second step of spatial matching between these two image planes. These two steps can be followed by a third step of temporal matching. The method provided requires objects, the surface of which has a parametric representation, i.e. a mathematical representation of the object surface having the form of a decomposition over a scalar function basis. The parametric representation is implemented during the first calibration step and/or during the second and third steps of spatial or temporal matching.
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公开(公告)号：US10739281B2
公开(公告)日：2020-08-11
申请号：US15318962
申请日：2015-06-01
发明人： François Hild , Hugo Leclerc , Stéphane Roux
IPC分类号： G01N23/046 , G01B15/06 , G01N3/08
摘要： A tomography scanner includes at least one first emission source (GX1), one first matrix detector (D1), and a computer (C) arranged to produce an initial tomography of an object (E) based on radiographs arising from the first matrix detector, taken from various angles. The tomography scanner further includes a second emission source (GX2) and a second matrix detector (D2) arranged so that, when the object is subjected to a loading that is known at a given instant in time, the computer determines the changes in the object subjected to said loading based only on the information from the first radiograph of the object under loading arising from the first matrix detector, from the second radiograph of the object under loading arising from the second matrix detector and the initial tomograph, the first radiograph and the second radiograph being taken simultaneously at the same given instant in time.
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6.发明申请公开(公告)号：US20150153162A1
公开(公告)日：2015-06-04
申请号：US14404918
申请日：2013-05-24
发明人： François Hild , Stéphane Roux
IPC分类号： G01B11/245 , G06T7/00
CPC分类号： G01B11/245 , G06T7/593 , G06T7/85
摘要： In the field of methods of three-dimensional measurement of an object by stereo-correlation, methods require at least two cameras connected to image processing means. These methods include at least a first step of calibration of the two image planes and a second step of spatial matching between these two image planes. These two steps can be followed by a third step of temporal matching. The method provided requires objects, the surface of which has a parametric representation, i.e. a mathematical representation of the object surface having the form of a decomposition over a scalar function basis. The parametric representation is implemented during the first calibration step and/or during the second and third steps of spatial or temporal matching.
摘要翻译： 在通过立体相关的三维测量对象的方法领域中，方法需要至少两台连接到图像处理装置的摄像机。 这些方法至少包括校准两个图像平面的第一步骤和这两个图像平面之间的空间匹配的第二步骤。 这两个步骤可以跟随第三步的时间匹配。 所提供的方法需要对象，其表面具有参数表示，即具有基于标量函数的分解形式的对象表面的数学表示。 参数化表示在第一校准步骤期间和/或在空间或时间匹配的第二和第三步骤期间实现。
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