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Christian Depeursinge

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Publications associées (88)

Local demodulation of holograms using the Riesz transform with application to microscopy

Christian Depeursinge, Michaël Unser, Nicolas Pavillon, Chandra Sekhar Seelamantula

We propose a Riesz transform approach to the demodulation of digital holograms. The Riesz transform is a higher-dimensional extension of the Hilbert transform and is steerable to a desired orientation. Accurate demodulation of the hologram requires a relia ...

Optical Society of America2012

Accelerated autofocusing of off-axis holograms using critical sampling

Christian Depeursinge, Jérôme Parent, Muhammed Fatih Toy, Marcel Egli, Stéphane Richard

In this Letter we propose a fast off-axis hologram autofocusing (AF) approach that is based on the redundant data elimination by the critical resampling of the contained complex field. Implementation of the proposed methodology enables the real-time AF wit ...

Optical Society of America2012

Monte Carlo simulation of the field back-scattered from rough surfaces

Stéphane Chamot, Christian Depeursinge, Yves Delacrétaz

A novel approach for the simulation of the field back-scattered from a rough surface is presented. It takes into account polarization and multiple scattering events on the surface, as well as diffraction effects. The validity and usefulness of this simulat ...

2012

Spatially-Resolved Eigenmode Decomposition of Red Blood Cells Membrane Fluctuations Questions the Role of ATP in Flickering

Christian Depeursinge, Pierre Marquet, Pierre Magistretti, Dimitri Nestor Alice Van De Ville, Annick Hoffmann, Daniel Boss, Benjamin Rappaz

Red blood cells (RBCs) present unique reversible shape deformability, essential for both function and survival, resulting notably in cell membrane fluctuations (CMF). These CMF have been subject of many studies in order to obtain a better understanding of ...

Public Library Science2012

Dual wavelength full field imaging in low coherence digital holographic microscopy

Frédéric Montfort, Christian Depeursinge, Christophe Moser, Zahra Monemhaghdoust

A diffractive optical element (DOE) is presented to simultaneously manipulate the coherence plane tilt of a beam containing a plurality of discrete wavelengths. The DOE is inserted into the reference arm of an off-axis dual wavelength low coherence digital ...

Optical Society of America2011

Beyond the lateral resolution limit by phase imaging

Christian Depeursinge, Yann Jérôme Michel Pascal Cotte, Muhammed Fatih Toy

We present a theory to extend the classical Abbe resolution limit by introducing a spatially varying phase into the illumination beam of a phase imaging system. It allows measuring lateral and axial distance differences between point sources to a higher ac ...

SPIE Society of Photo-optical Instrumentation Engineers2011

Exact Complex-Wave Reconstruction in Digital Holography

Christian Depeursinge, Michaël Unser, Nicolas Pavillon, Chandra Sekhar Seelamantula

We address the problem of exact complex-wave reconstruction in digital holography. We show that, by confining the object-wave modulation to one quadrant of the frequency domain, and by maintaining a reference-wave intensity higher than that of the object, ...

OSA2011

Complex index refraction tomography with sub ?/6-resolution

Christian Depeursinge, Nicolas Pavillon, Yann Jérôme Michel Pascal Cotte

The present invention discloses a method to improve the image resolution of a microscope. This improvement is based on the mathematical processing of the complex field computed from the measurements with a microscope of the wave emitted or scattered by the ...

2011

Realistic 3D coherent transfer function inverse filtering of complex fields

Christian Depeursinge, Daniel Boss, Cristian Arfire, Yann Jérôme Michel Pascal Cotte, Muhammed Fatih Toy, Shanshan Kou

We present a novel technique for three-dimensional (3D) image processing of complex fields. It consists in inverting the coherent image formation by filtering the complex spectrum with a realistic 3D coherent transfer function (CTF) of a high-NA digital ho ...

Optical Society of America2011

Quantitative phase restoration by direct inversion using the optical transfer function

Christian Depeursinge, Pierre Marquet, Laura Waller, Shanshan Kou

Quantitative phase recovery of phase objects is achieved by a direct inversion using the defocused weak object transfer function. The presented method is noniterative and is based on partially coherent principles. It also takes into account the optical pro ...

Optical Society of America2011

Determination of Transmembrane Water Fluxes in Neurons Elicited by Glutamate Ionotropic Receptors and by the Co-transporters KCC2 and NKCC1: A Digital Holographic Microscopy Study

Christian Depeursinge, Pierre Marquet, Pierre Magistretti, Nicolas Pavillon, Pascal Jourdain, Daniel Boss, Benjamin Rappaz, Corinne Moratal

Digital holographic microscopy (DHM) is a noninvasive optical imaging technique that provides quantitative phase images of living cells. In a recent study, we showed that the quantitative monitoring of the phase signal by DHM was a simple label-free method ...

Society for Neuroscience2011

A method and apparatus for enhanced spatial bandwidth wavefronts reconstructed from digital interferograms or holograms

Christian Depeursinge, Michaël Unser, Nicolas Pavillon, Chandra Sekhar Seelamantula

The present invention discloses a method and an apparatus to compute a complex wavefield, referred to as the object wave o, by means of measuring the intensity signal resulting from the interference of the said object wave with a second wave termed the ref ...

2010

Method and apparatus for 3d object shape and surface topology measurements by contour depth extraction acquired in a single shot

Christian Depeursinge, Yves Delacrétaz, Daniel Boss

The invention relates to a method and apparatus for topological or shape measurement of objects of any size, by using an interferometric technique comprising an optical source, with selectable coherence, allowing contouring from single shot interferograms ...

2010

Digital holographic reflectometry

Tristan Colomb, Christian Depeursinge, Jonas Kühn, Nicolas Pavillon, Ahmet Ata Akatay

Digital holographic microscopy (DHM) is an interferometric technique that allows real-time imaging of the entire complex optical wavefront (amplitude and phase) reflected by or transmitted through a sample. To our knowledge, only the quantitative phase is ...

2010

Microscopy image resolution improvement by deconvolution of complex fields

Christian Depeursinge, Nicolas Pavillon, Yann Jérôme Michel Pascal Cotte, Muhammed Fatih Toy

Based on truncated inverse filtering, a theory for deconvolution of complex fields is studied. The validity of the theory is verified by comparing with experimental data from digital holographic microscopy (DHM) using a high-NA system (NA=0.95). Comparison ...

Optical Society of America2010

Digital holographic microscopy real-time monitoring of cytoarchitectural alterations during simulated microgravity

Christian Depeursinge, Jonas Kühn, Jérôme Parent, Christophe Pache, Muhammed Fatih Toy, Marcel Egli

Previous investigations on mammalian cells have shown that microgravity, either that experienced in space, or simulated on earth, causes severe cellular modifications that compromise tissue determination and function. The aim of this study is to investigat ...

SPIE Society of Photo-optical Instrumentation Engineers2010

Sub-Rayleigh resolution by phase imaging

Christian Depeursinge, Nicolas Pavillon, Etienne Shaffer, Yann Jérôme Michel Pascal Cotte, Muhammed Fatih Toy

We report the experimental observation of systematically occurring phase singularities in coherent imaging of sub-Rayleigh distanced objects. A theory that relates the observation to the sub-Rayleigh distance is presented and compared with experimental mea ...

Optical Society of America2010

Endoscopic low coherence topography measurement for upper airways and hollow samples

Christian Depeursinge, Jonas Kühn, Yves Delacrétaz, Nicolas Pavillon, Etienne Shaffer, Florian Lang

To evaluate the severity of airway pathologies, quantitative dimensioning of airways is of utmost importance. Endoscopic vision gives a projective image and thus no true scaling information can be directly deduced from it. In this article, an approach base ...

SPIE Society of Photo-optical Instrumentation Engineers2010

Real time, nanometric 3D-tracking of nanoparticles made possible by second harmonic generation digital holographic microscopy

Christian Depeursinge, Pierre Marquet, Etienne Shaffer

In the past decade, quantitative phase imaging gave a new dimension to optical microscopy, and the recent extension of digital holography techniques to nonlinear microscopy appears very promising, for the phase of nonlinear signal provides additional infor ...

Optical Society of America2010

Method and apparatus for retrieval of amplitude and phase of nonlinear electromagnetic waves

Christian Depeursinge, Etienne Shaffer

The present invention discloses a method and its associated apparatus to retrieve the amplitude and, especially, the phase of nonlinear electromagnetic waves. The application field of the present invention is optical imaging. A sample is probed by coherent ...

2010

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