Publications related to Circle of confusion

Structured light engineering using a photonic nanojet

Toralf Scharf, Maryam Yousefi, Daniel Necesal

In this Letter, we present the photonic nanojet as a phenomenon in a structured light generator system that is implemented to modify the source focal spot size and emission angle. The optical system comprises a microlens array that is illuminated by a focu ...

OPTICAL SOC AMER2021

Phase calibration of a basic bright-field microscope for 3D metrology of transparent samples at the nanoscale

Martinus Gijs, Daniel Migliozzi, Bingying Zhao

Optical retrieval of the structure of transparent objects at the nano-scale requires adapted methods capable of probing their interaction with suitable light. Scattering events, for instance, depend on the content and the arrangement of the medium encounte ...

SPIE-INT SOC OPTICAL ENGINEERING2021

Solving the Depth Ambiguity in Single-Perspective Images

Sabine Süsstrunk, Majed El Helou, Marjan Shahpaski

Scene depth estimation is gaining in importance as more and more AR/VR and robot vision applications are developed. Conventional depth-from-defocus techniques can passively provide depth maps from a single image. This is especially advantageous for moving ...

2019

Fourier light scattering model for treating textures deeper than the wavelength

Christophe Ballif, Franz-Josef Haug, Matthias Wolfgang Bräuninger

We apply a Fourier-scattering model to describe light scattering in solar cells with textured surfaces. For the size and inclination angle of typical micro-textures, scattering may occur into large angles. This makes the model prone to paraxial errors. We ...

Optical Society of America2017

Refraction limit of miniaturized optical systems: a ball-lens example

Hans Peter Herzig, Roland Andreas Bitterli, Toralf Scharf, Wilfried Noell, Myun Sik Kim

We study experimentally and theoretically the electromagnetic field in amplitude and phase behind ball-lenses across a wide range of diameters, ranging from a millimeter scale down to a micrometer. Based on the observation, we study the transition between ...

Optical Society of America2016

Non-parametric Blur Map Regression for Depth of Field Extension

Sabine Süsstrunk

Real camera systems have a limited depth of field (DOF) which may cause an image to be degraded due to visible misfocus or too shallow DOF. In this paper, we present a blind deblurring pipeline able to restore such images by slightly extending their DOF an ...

Institute of Electrical and Electronics Engineers2016

Aberrations of the point spread function of a multimode fiber due to partial mode excitation

Adrien Charles-François Raymond Descloux

We investigate the point spread function of a multimode fiber. The distortion of the focal spot created on the fiber output facet is studied for a variety of the parameters. We develop a theoretical model of wavefront shaping through a multimode fiber and ...

Optical Society of America2016

Variational Phase Imaging Using the Transport-of-Intensity Equation

Michaël Unser, Daniel Sage, Emrah Bostan, Masih Nilchian, Emmanuel Augustin Julien Froustey

We introduce a variational phase retrieval algorithm for the imaging of transparent objects. Our formalism is based on the transport-of-intensity equation (TIE), which relates the phase of an optical field to the variation of its intensity along the direct ...

IEEE2016

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Circle of confusion

Structured light engineering using a photonic nanojet

Structured light generation by refractive-diffractive micro optical array illuminators

Phase calibration of a basic bright-field microscope for 3D metrology of transparent samples at the nanoscale

Learning stereo reconstruction with deep neural networks

Solving the Depth Ambiguity in Single-Perspective Images

Fourier light scattering model for treating textures deeper than the wavelength

Refraction limit of miniaturized optical systems: a ball-lens example

Non-parametric Blur Map Regression for Depth of Field Extension

Aberrations of the point spread function of a multimode fiber due to partial mode excitation

Variational Phase Imaging Using the Transport-of-Intensity Equation

Graph Chatbot

Chat with Graph Search

Learning stereo reconstruction with deep neural networks

Structured light engineering using a photonic nanojet

Phase calibration of a basic bright-field microscope for 3D metrology of transparent samples at the nanoscale

Fourier light scattering model for treating textures deeper than the wavelength

Structured light generation by refractive-diffractive micro optical array illuminators

Solving the Depth Ambiguity in Single-Perspective Images

Refraction limit of miniaturized optical systems: a ball-lens example

Non-parametric Blur Map Regression for Depth of Field Extension

Aberrations of the point spread function of a multimode fiber due to partial mode excitation

Variational Phase Imaging Using the Transport-of-Intensity Equation