Hervé Sauer
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View article: Impact of image registration errors on the quality of hyperspectral images in imaging static Fourier transform spectrometry
Impact of image registration errors on the quality of hyperspectral images in imaging static Fourier transform spectrometry Open
Imaging static Fourier transform spectrometry (isFTS) is used for pushbroom airborne or spaceborne hyperspectral remote sensing. In isFTS, a static two-wave interferometer imprints linear interference fringes over the image of the scene, s…
View article: Imaging static Fourier transform spectrometry: impact of trajectory perturbations on the hyperspectral images
Imaging static Fourier transform spectrometry: impact of trajectory perturbations on the hyperspectral images Open
Imaging static Fourier transform spectrometry (isFTS) may be used for pushbroom air-or spaceborne hyperspectral remote sensing.In isFTS, the spectral information is multiplexed over several instantaneous images, and numerical reconstructio…
View article: Improved performance of a hybrid optical/digital imaging system with fast piecewise Wiener deconvolution
Improved performance of a hybrid optical/digital imaging system with fast piecewise Wiener deconvolution Open
We quantitatively investigate how spatially varying deblurring algorithms can improve the imaging performance of hybrid optical/digital systems affected by field aberrations. To this end, we validate a theoretical model of the maximal gain…
View article: End-to-end optimization of optical systems with extended depth of field under wide spectrum illumination
End-to-end optimization of optical systems with extended depth of field under wide spectrum illumination Open
We study a way to take into account the scene illumination spectrum during end-to-end optimization of optical-digital hybrid systems that include annular binary phase masks to enhance their depth of field (DoF). We show that a phase mask s…
View article: Comparison of three methods for end-to-end optimization of hybrid optical/digital imaging systems with professional optical design software
Comparison of three methods for end-to-end optimization of hybrid optical/digital imaging systems with professional optical design software Open
We compare different methods to optimize end-to-end a hybrid optical/digital system for best and most uniform performance over the field-of-view with the Synopsys® CodeV® lens design software. We have extended the native optimization capab…
View article: Comparison of methods for end-to-end co-optimization of optical systems and image processing with commercial lens design software
Comparison of methods for end-to-end co-optimization of optical systems and image processing with commercial lens design software Open
We compare three different methods to co-optimize hybrid optical/digital imaging systems with a commercial lens design software: conventional optimization based on spot diagram minimization, optimization of a surrogate criterion based on a…
View article: How to integrate digital post-processing algorithms in professional optical design software for co-designing complex optical systems?
How to integrate digital post-processing algorithms in professional optical design software for co-designing complex optical systems? Open
International audience
View article: Influence of high numerical aperture on depth-of-field enhancing phase mask optimization in localization microscopy
Influence of high numerical aperture on depth-of-field enhancing phase mask optimization in localization microscopy Open
The depth-of-field (DoF) of localization microscopes can be extended by placing a phase mask in the aperture stop of the objective. To optimize these masks and characterize their performance, defocus is in general modeled by a simple quadr…
View article: Theoretical and experimental analysis of co-designed binary phase masks for enhancing the depth of field of panchromatic cameras
Theoretical and experimental analysis of co-designed binary phase masks for enhancing the depth of field of panchromatic cameras Open
International audience
View article: Co-designed annular binary phase masks for depth-of-field extension in single-molecule localization microscopy
Co-designed annular binary phase masks for depth-of-field extension in single-molecule localization microscopy Open
Single-molecule localization microscopy has become a prominent approach to study structural and dynamic arrangements of nanometric objects well beyond the diffraction limit. To maximize localization precision, high numerical aperture objec…
View article: What is the depth of field reachable in practice with generic binary phase masks and digital deconvolution?
What is the depth of field reachable in practice with generic binary phase masks and digital deconvolution? Open
We investigate the practical behavior of a co-optimized hybrid system involving a generic binary phase mask and digital deconvolution. We perform experiments with a case-study optical system with observed scene lighting by LED of different…
View article: Can phase masks extend depth-of-field in localization microscopy?
Can phase masks extend depth-of-field in localization microscopy? Open
In localization microscopy, the position of isolated fluorescent emitters are estimated with a resolution better than the diffraction limit. In order to image thick samples, which are common in biological applications, there is considerabl…
View article: Experimental validation of hybrid optical–digital imaging system for extended depth-of-field based on co-optimized binary phase masks
Experimental validation of hybrid optical–digital imaging system for extended depth-of-field based on co-optimized binary phase masks Open
We experimentally investigate the performance of co-optimized hybrid optical–digital imaging systems based on binary phase masks and digital deconvolution for extended depth-of-field (DoF) under narrow-band illumination hypothesis. These s…
View article: Numerical modeling of nominal and stray waves in birefringent interferometers: application to large-field-of-view imaging Fourier transform spectrometers
Numerical modeling of nominal and stray waves in birefringent interferometers: application to large-field-of-view imaging Fourier transform spectrometers Open
Birefringent interferometers are often used for compact static Fourier transform spectrometers. In such devices, several uniaxial birefringent parallel or prismatic plates are stacked, with their optical axes set so that there is an effici…
View article: Joint digital-optical design of complex lenses using a surrogate image quality criterion adapted to commercial optical design software
Joint digital-optical design of complex lenses using a surrogate image quality criterion adapted to commercial optical design software Open
Like classical optical design, joint digital-optical design of complex lenses requires a skilled optical designer helped by powerful optical design software. Consequently, if optimization criteria have to be modified to take into account d…
View article: Performance limits of binary annular phase masks codesigned for depth-of-field extension
Performance limits of binary annular phase masks codesigned for depth-of-field extension Open
We investigate the performance limits of hybrid imaging systems including annular binary phase masks optimized for depth-of-field (DoF) extension, as a function of the number of rings and the desired DoF range. The mask parameters are opti…
View article: Le contraste interférentiel différentiel Nomarski en microscopie
Le contraste interférentiel différentiel Nomarski en microscopie Open
\n\t\t\t\tLe contraste interférentiel différentiel (CID) est une technique utilisée en microscopie, tant par réflexion que par transmission, pour faire apparaître, à l'instar du contraste de phase, des contrastes dans des objets microscopi…
View article: Miniature and cooled hyperspectral camera for outdoor surveillance applications in the mid-infrared
Miniature and cooled hyperspectral camera for outdoor surveillance applications in the mid-infrared Open
We present the design and the realization of a compact and robust imaging spectrometer in the mid-infrared spectral range. This camera combines a small static Fourier transform birefringent interferometer and a cooled miniaturized infrared…
View article: Reduction of material mass of optical component in cryogenic camera by using high-order Fresnel lens on a thin germanium substrate
Reduction of material mass of optical component in cryogenic camera by using high-order Fresnel lens on a thin germanium substrate Open
We designed a compact infrared cryogenic camera using only one lens mounted inside the detector area. In the field of cooled infrared imaging systems, the maximal detector area is determined by the dewar. It is generally a sealed and coole…