Résumé: This paper presents an early study about a reconstruction method that extends previous sp... more Résumé: This paper presents an early study about a reconstruction method that extends previous space carving methods to handle all characteristics of human faces: complex non-Lambertian materials, untextured areas, highly detailed geometry, etc. This face study is seen as a preliminary step to a more general framework for non-Lambertian reconstruction. We therefore avoid specific techniques like parameterized face models. Since we expose our early studies, we mainly present the related existing work and discuss the pros and ...
Interpolation between pairs of values, typically vectors, is a fundamental operation in many comp... more Interpolation between pairs of values, typically vectors, is a fundamental operation in many computer graphics applications. In some cases simple linear interpolation yields meaningful results without requiring domain knowledge. However, interpolation between pairs of distributions or pairs of functions often demands more care because features may exhibit translational motion between exemplars. This property is not captured by linear interpolation. This paper develops the use of displacement interpolation for this class of problem, which provides a generic method for interpolating between distributions or functions based on advection instead of blending. The functions can be non-uniformly sampled, high-dimensional, and defined on non-Euclidean manifolds, e.g., spheres and tori. Our method decomposes distributions or functions into sums of radial basis functions (RBFs). We solve a mass transport problem to pair the RBFs and apply partial transport to obtain the interpolated function....
Résumé: This paper presents an early study about a reconstruction method that extends previous sp... more Résumé: This paper presents an early study about a reconstruction method that extends previous space carving methods to handle all characteristics of human faces: complex non-Lambertian materials, untextured areas, highly detailed geometry, etc. This face study is seen as a preliminary step to a more general framework for non-Lambertian reconstruction. We therefore avoid specific techniques like parameterized face models.
Multi-scale manipulations are central to image editing but they are also prone to halos. Achievin... more Multi-scale manipulations are central to image editing but they are also prone to halos. Achieving artifact-free results requires sophisticated edgeaware techniques and careful parameter tuning. These shortcomings were recently addressed by the local Laplacian filters, which can achieve a broad range of effects using standard Laplacian pyramids. However, these filters are slow to evaluate and their relationship to other approaches is unclear.
Abstract We present a method to relight human faces in real time, using consumer-grade graphics c... more Abstract We present a method to relight human faces in real time, using consumer-grade graphics cards even with limited 3D capabilities. We show how to render faces using a combination of a simple, hardware-accelerated parametric model simulating skin shading and a detail texture map, and provide robust procedures to estimate all the necessary parameters for a given face.
Abstract An intrinsic image is a decomposition of a photo into an illumination layer and a reflec... more Abstract An intrinsic image is a decomposition of a photo into an illumination layer and a reflectance layer, which enables powerful editing such as the alteration of an object's material independently of its illumination. However, decomposing a single photo is highly under-constrained and existing methods require user assistance or handle only simple scenes. In this paper, we compute intrinsic decompositions using several images of the same scene under different viewpoints and lighting conditions.
Abstract We propose a simple algorithm to control the spatial location of reconstruction errors i... more Abstract We propose a simple algorithm to control the spatial location of reconstruction errors inherent in gradient-based image compositing. We build upon the classical Poisson equation and add a weighting term that controls where reconstruction errors can occur. We define this term in such a way that residuals are mainly located in textured regions where they are less visible. Our approach is independent of how the composited gradient field has been built and is complementary to the methods that focus on this aspect.
Résumé: We show how the graph flow technique can be used to solve some complex optimization proble... more Résumé: We show how the graph flow technique can be used to solve some complex optimization problems. This technique is used here to acquire 3D information using several points of view. We show how–with an adapted graph–it is possible to minimize a category of energies which can reach more precise results than the usual disparity maps. This novel approach also takes object discontinuities into account. The results obtained with the method are exposed.
ABSTRACT Presentation and graphics software enables users to experiment with variations of illust... more ABSTRACT Presentation and graphics software enables users to experiment with variations of illustrations. They can revisit recent editing operations using the ubiquitous undo command, but they are limited to sequential exploration. We propose a new interaction metaphor and visualization for operation history. While editing, a user can access a history mode in which actions are denoted by graphical depictions appearing on top of the document.
The bilateral filter is a nonlinear filter that smoothes a signal while preserving strong edges. ... more The bilateral filter is a nonlinear filter that smoothes a signal while preserving strong edges. It has demonstrated great effectiveness for a variety of problems in computer vision and computer graphics, and a fast version has been proposed. Unfortunately, little is known about the accuracy of such acceleration. In this paper, we propose a new signal-processing analysis of the bilateral filter, which complements the recent studies that analyzed it as a PDE or as a robust statistics estimator.
Résumé: This paper presents an early study about a reconstruction method that extends previous sp... more Résumé: This paper presents an early study about a reconstruction method that extends previous space carving methods to handle all characteristics of human faces: complex non-Lambertian materials, untextured areas, highly detailed geometry, etc. This face study is seen as a preliminary step to a more general framework for non-Lambertian reconstruction. We therefore avoid specific techniques like parameterized face models. Since we expose our early studies, we mainly present the related existing work and discuss the pros and ...
Interpolation between pairs of values, typically vectors, is a fundamental operation in many comp... more Interpolation between pairs of values, typically vectors, is a fundamental operation in many computer graphics applications. In some cases simple linear interpolation yields meaningful results without requiring domain knowledge. However, interpolation between pairs of distributions or pairs of functions often demands more care because features may exhibit translational motion between exemplars. This property is not captured by linear interpolation. This paper develops the use of displacement interpolation for this class of problem, which provides a generic method for interpolating between distributions or functions based on advection instead of blending. The functions can be non-uniformly sampled, high-dimensional, and defined on non-Euclidean manifolds, e.g., spheres and tori. Our method decomposes distributions or functions into sums of radial basis functions (RBFs). We solve a mass transport problem to pair the RBFs and apply partial transport to obtain the interpolated function....
Résumé: This paper presents an early study about a reconstruction method that extends previous sp... more Résumé: This paper presents an early study about a reconstruction method that extends previous space carving methods to handle all characteristics of human faces: complex non-Lambertian materials, untextured areas, highly detailed geometry, etc. This face study is seen as a preliminary step to a more general framework for non-Lambertian reconstruction. We therefore avoid specific techniques like parameterized face models.
Multi-scale manipulations are central to image editing but they are also prone to halos. Achievin... more Multi-scale manipulations are central to image editing but they are also prone to halos. Achieving artifact-free results requires sophisticated edgeaware techniques and careful parameter tuning. These shortcomings were recently addressed by the local Laplacian filters, which can achieve a broad range of effects using standard Laplacian pyramids. However, these filters are slow to evaluate and their relationship to other approaches is unclear.
Abstract We present a method to relight human faces in real time, using consumer-grade graphics c... more Abstract We present a method to relight human faces in real time, using consumer-grade graphics cards even with limited 3D capabilities. We show how to render faces using a combination of a simple, hardware-accelerated parametric model simulating skin shading and a detail texture map, and provide robust procedures to estimate all the necessary parameters for a given face.
Abstract An intrinsic image is a decomposition of a photo into an illumination layer and a reflec... more Abstract An intrinsic image is a decomposition of a photo into an illumination layer and a reflectance layer, which enables powerful editing such as the alteration of an object's material independently of its illumination. However, decomposing a single photo is highly under-constrained and existing methods require user assistance or handle only simple scenes. In this paper, we compute intrinsic decompositions using several images of the same scene under different viewpoints and lighting conditions.
Abstract We propose a simple algorithm to control the spatial location of reconstruction errors i... more Abstract We propose a simple algorithm to control the spatial location of reconstruction errors inherent in gradient-based image compositing. We build upon the classical Poisson equation and add a weighting term that controls where reconstruction errors can occur. We define this term in such a way that residuals are mainly located in textured regions where they are less visible. Our approach is independent of how the composited gradient field has been built and is complementary to the methods that focus on this aspect.
Résumé: We show how the graph flow technique can be used to solve some complex optimization proble... more Résumé: We show how the graph flow technique can be used to solve some complex optimization problems. This technique is used here to acquire 3D information using several points of view. We show how–with an adapted graph–it is possible to minimize a category of energies which can reach more precise results than the usual disparity maps. This novel approach also takes object discontinuities into account. The results obtained with the method are exposed.
ABSTRACT Presentation and graphics software enables users to experiment with variations of illust... more ABSTRACT Presentation and graphics software enables users to experiment with variations of illustrations. They can revisit recent editing operations using the ubiquitous undo command, but they are limited to sequential exploration. We propose a new interaction metaphor and visualization for operation history. While editing, a user can access a history mode in which actions are denoted by graphical depictions appearing on top of the document.
The bilateral filter is a nonlinear filter that smoothes a signal while preserving strong edges. ... more The bilateral filter is a nonlinear filter that smoothes a signal while preserving strong edges. It has demonstrated great effectiveness for a variety of problems in computer vision and computer graphics, and a fast version has been proposed. Unfortunately, little is known about the accuracy of such acceleration. In this paper, we propose a new signal-processing analysis of the bilateral filter, which complements the recent studies that analyzed it as a PDE or as a robust statistics estimator.
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Papers by Sylvain Paris