Georges-Pierre Bonneau’s research while affiliated with National Institute for Research in Computer Science and Control and other places

... Due to significant advances in consumer-grade AR and VR hardware and software, it is now possible to sketch 3D curves directly in mid-air. Several software tools have been developed based on generating surfaces through 3D sketches, using controllers [17,18], motion-capture pens [19], hand tracking [20], or trackers and specialised VR gloves to monitor finger trajectories or hand movements [21]. Many of these conceptual design methods, such as sketch-based interfaces, require designers to construct all the surface edges before visualising the final surface as for a Boundary-Representation (B-Rep) approach. ...

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Interactive Modelling in Augmented Reality with Subdivision Surfaces and Advanced User Gesture Recognition

... Important categories of auxetics include solid cellular foams (1) or honeycombs (4,5), microporous polymers (6, 7), composites (8,9), some biomaterials such as skin (10) and bone (11), and some crystalline materials (12,13). They have also been created from random fiber networks (14), often by bond pruning (15,16), and via elastic buckling instabilities (17)(18)(19)(20) and origami (21). At the level of internal micro-or mesoscopic structuring, auxetics are often based on chiral subunits (22), rotating rigid subunits (23)(24)(25), or reentrant subunits with negative internal angles (26). ...

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Reduced stress propagation leads to increased mechanical failure resistance in auxetic materials

... Attempts to predict the path of the COVID-19 outbreak (Ayyoubzadeh et al. 2020) serve as an example. Rather, Post, Nielson, and Bonneau (2003) and Friedman (2008) recommend using data visualization techniques to quickly assimilate a critical situation and employ predictive models to statistically validate the visual trends. As a result, the focus has shifted toward 'visualizations that really work' (Berinato 2016;Lane 2017). ...

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Data Science in a Pandemic

... This technique accelerates the calculation of the weights of connection . The MRA (Jawerth and Sweldens, 1993;Bonneau et al., 2008;Ejbali and Zaied, 2017) compute two types of weights which are the approximate weights (A) and the detailed weights (D). In our case, we were interested only in using the detailed weights because they are more representative as they use a convolution by dyadic wavelets. ...

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A Deep Convolutional Neural Wavelet Network for Classification of Medical Images

... Different technologies exist to perform such measurements. Most state-of-the-art technologies use inertial sensors (a combination of accelerometers and magnetometers) to measure angles from the gravity vector and Earth's magnetic North and have been investigated to reconstruct both 3D curves and surfaces [11][12][13][14][15][16]. Note that if the surface experiences large accelerations, the accelerometers fail to detect the direction of gravity. ...

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Inextensible Surface Reconstruction Under Small Relative Deformations from Distributed Angle Measurements

... As a first task, the SF is interpolated onto regularly spaced intervals on the current-carrying surface by a finite number of samples. 18 Iso-potential contour lines then form the basis of the coil layout as closed loops, which are then further processed into the final wire pattern. ...

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CoilGen: Open‐source MR coil layout generator

... As a consequence, a number of surfacing algorithms strongly rely on the connectivity of the curve network to identify closed cycles delimiting surface patches [Abbasinejad et al. 2011;Sadri and Singh 2014;Zhuang et al. 2013]. Each such patch can then be surfaced by propagating geometric information from the boundary curves [Bessmeltsev et al. 2012;Pan et al. 2015;Stanko et al. 2016]. Curve connectivity information provides strong geometric hints, since surface normals can be estimated at each intersection -as done by Pan et al. [2015] to detect sharp features and determine which curves are flow lines. ...

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Piecewise-smooth surface fitting onto unstructured 3D sketches

... However, due to the difficulty in analytically solving PDEs, existing tools of manipulating sculpting forces are mainly developed from an analytical solution to a vectorvalued PDE for simple 2-sided PDE patches [5] or from a numerical solution for complicated 3D models [6]. Various numerical methods such as the finite-element method [7][8][9], finite-difference method [10,11], and direct discretization of polygonal models using a discrete Laplace operator [12,13] have been proposed to solve PDEs for hybrid subdivision surface design [14], surface reconstruction [13], estimation of surface normal [12], smoothing arbitrary triangle meshes [15], surface modeling [7], direct shape manipulation [6], and engineering optimization applications [16,17]. ...

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Interactive PDE patch-based surface modeling from vertex-frames

... For specular ones, shading patterns are correlated to view-dependent second-order shape properties, and therefore provide information about the curvature of the surface. This means that, regardless of material and illumination, properties that are crucial for the perception of shape can be inferred from shading flows [Ver+16]. ...

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Light Manipulation for an Expressive Depiction of Shape and Depth: Drawing on Pierre Novat's Hand-Painted Mountain Panoramas

... A Perlin noise image was used as a stimulus test (480 x 480 pixels, 1.98 deg angular subtend). Perlin noise is a procedural texture based on lattice gradient noise [200], which is easily modulated using two computational parameters, the base frequency and persistence [201]. This type of noise produces a repeatable pseudo-random value for each input position, has a known range and band-limited spatial frequency, does not show obvious repeating patterns, and its spatial frequency is invariant under translation [202], which makes it especially suitable for studying astigmatic images. ...

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Polychromatic Adaptive Optics to evaluate the impact of manipulated optics on vision