Person
Philippe Thévenaz
Related publications (65)
On the Linearity of Bayesian Interpolators for Non-Gaussian Continuous-Time AR(1) Processes
Michaël Unser, Philippe Thévenaz, Arash Amini, John Paul Ward
Bayesian estimation problems involving Gaussian distributions often result in linear estimation techniques. Nevertheless, there are no general statements as to whether the linearity of the Bayesian estimator is restricted to the Gaussian case. The two comm ...
Ieee-Inst Electrical Electronics Engineers Inc2013GPU Prefilter for Accurate Cubic B-spline Interpolation
Achieving accurate interpolation is an important requirement for many signal-processing applications. While nearest-neighbor and linear interpolation methods are popular due to their native GPU support, they unfortunately result in severe undesirable artif ...
Oxford University Press2012Exponential splines and minimal-support bases for curve representation
Michaël Unser, Philippe Thévenaz, Ricard Delgado Gonzalo
Our interest is to characterize the spline-like integer-shift-invariant bases capable of reproducing exponential polynomial curves. We prove that any compact-support function that reproduces a subspace of the exponential polynomials can be expressed as the ...
Elsevier2012Snakes With an Ellipse-Reproducing Property
Michaël Unser, Philippe Thévenaz, Ricard Delgado Gonzalo, Chandra Sekhar Seelamantula
We present a new class of continuously defined parametric snakes using a special kind of exponential splines as basis functions. We have enforced our bases to have the shortest possible support subject to some design constraints to maximize efficiency. Whi ...
IEEE2012Bi-Exponential Edge-Preserving Smoother
Michaël Unser, Daniel Sage, Philippe Thévenaz
Edge-preserving smoothers need not be taxed by a severe computational cost. We present, in this paper, a lean algorithm that is inspired by the bi-exponential filter and preserves its structure-a pair of one-tap recursions. By a careful but simple local ad ...
Institute of Electrical and Electronics Engineers2012The Ovuscule
Michaël Unser, Philippe Thévenaz, Ricard Delgado Gonzalo
We propose an active contour (a.k.a. snake) that takes the shape of an ellipse. Its evolution is driven by surface terms made of two contributions: the integral of the data over an inner ellipse, counterbalanced by the integral of the data over an outer el ...
IEEE2011Model-Based Estimation of Three-Dimensional Stiffness Parameters in Photonic-Force Microscopy
Michaël Unser, Andrzej Kulik, Philippe Thévenaz, Elena Bertseva, Amardeep Singh
We propose a system to characterize the 3-D diffusion properties of the probing bead trapped by a photonic-force microscope. We follow a model-based approach, where the model of the dynamics of the bead is given by the Langevin equation. Our procedure comb ...
Institute of Electrical and Electronics Engineers2010Regularized Interpolation for Noisy Images
Michaël Unser, Philippe Thévenaz, Sathish Ramani
Interpolation is the means by which a continuously defined model is fit to discrete data samples. When the data samples are exempt of noise, it seems desirable to build the model by fitting them exactly. In medical imaging, where quality is of paramount im ...
IEEE2010Non-Rigid Consistent Registration of 2D Image Sequences
We present a novel algorithm for the registration of 2D image sequences that combines the principles of multiresolution B-spline-based elastic registration and those of bidirectional consistent registration. In our method, consecutive triples of images are ...
IOP Science2010Intracellular nanomanipulation by a photonic-force microscope with real-time acquisition of a 3D stiffness matrix
Michaël Unser, László Forró, Giovanni Dietler, Andrzej Kulik, Philippe Thévenaz, Gérard Gremaud, Sylvia Jeney, Elena Bertseva, Stefania Puttini, Amardeep Singh
A traditional photonic-force microscope (PFM) results in huge sets of data, which requires tedious numerical analysis. In this paper, we propose instead an analog signal processor to attain real-time capabilities while retaining the richness of the traditi ...
Institute of Physics2009