Chess recognition using 3D patterned illumination camera

2021 ◽  
Author(s):  
Lars Brunner ◽  
Mario Salvator ◽  
Philipp Roebrock ◽  
Udo J. Birk
Keyword(s):  
Patterned Illumination

Nulling the Movement Aftereffect: Evidence for Pattern Specificity

Perception ◽  
1974 ◽  
Vol 3 (3) ◽  
pp. 267-274 ◽  
Author(s):  
J E W Mayhew
Keyword(s):  
Opposite Direction ◽  
Test Surface ◽  
Homogeneous Field ◽  
Movement Aftereffect ◽  
Motion Detectors ◽  
Patterned Illumination ◽  
Two Populations

A microtextured surface such as a homogeneously illuminated tracing-paper screen provides an excellent test surface for the movement aftereffect. When it is moved against the aftereffect at the appropriate velocity, a null occurs and the screen appears stationary. However, if patterned illumination is superimposed on the homogeneous field, the nulling breaks down. The pattern appears to move in one direction, driven by the aftereffect, and the screen can be clearly seen moving in the opposite direction. This breakdown begins to occur at luminances just above threshold for the detection of the pattern. The implication is that two populations of motion detectors are involved. Evidence in support of this postulate is presented.

scholarly journals Resolution analysis in computational imaging with patterned illumination and bucket detection

2014 ◽  
Vol 39 (13) ◽  
pp. 3888 ◽  
Author(s):  
A. D. Rodríguez ◽  
P. Clemente ◽  
E. Irles ◽  
E. Tajahuerce ◽  
J. Lancis
Keyword(s):  
Computational Imaging ◽  
Resolution Analysis ◽  
Patterned Illumination

scholarly journals Parylene photonics: a flexible, broadband optical waveguide platform with integrated micromirrors for biointerfaces

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Jay W. Reddy ◽  
Maya Lassiter ◽  
Maysamreza Chamanzar
Keyword(s):  
Optical Waveguides ◽  
Brain Activity ◽  
Low Loss ◽  
Parylene C ◽  
Optogenetic Stimulation ◽  
Patterned Illumination ◽  
The Brain ◽  
532 Nm ◽  
Stimulation Of

Abstract Targeted light delivery into biological tissue is needed in applications such as optogenetic stimulation of the brain and in vivo functional or structural imaging of tissue. These applications require very compact, soft, and flexible implants that minimize damage to the tissue. Here, we demonstrate a novel implantable photonic platform based on a high-density, flexible array of ultracompact (30 μm × 5 μm), low-loss (3.2 dB/cm at λ = 680 nm, 4.1 dB/cm at λ = 633 nm, 4.9 dB/cm at λ = 532 nm, 6.1 dB/cm at λ = 450 nm) optical waveguides composed of biocompatible polymers Parylene C and polydimethylsiloxane (PDMS). This photonic platform features unique embedded input/output micromirrors that redirect light from the waveguides perpendicularly to the surface of the array for localized, patterned illumination in tissue. This architecture enables the design of a fully flexible, compact integrated photonic system for applications such as in vivo chronic optogenetic stimulation of brain activity.

scholarly journals Hydrogel Engineering with Widefield Patterned Illumination

2019 ◽  
Vol 116 (3) ◽  
pp. 464a
Author(s):  
Aurelien Pasturel ◽  
Pierre-Olivier Strale ◽  
Vincent Studer
Keyword(s):  
Patterned Illumination

scholarly journals Localization microscopy at doubled precision with patterned illumination

2019 ◽  
Vol 17 (1) ◽  
pp. 59-63 ◽  
Author(s):  
Jelmer Cnossen ◽  
Taylor Hinsdale ◽  
Rasmus Ø. Thorsen ◽  
Marijn Siemons ◽  
Florian Schueder ◽  
...  
Keyword(s):  
Localization Microscopy ◽  
Patterned Illumination

scholarly journals Optical-sectioning microscopy by patterned illumination

2010 ◽  
Vol 206 ◽  
pp. 012011
Author(s):  
G Saavedra ◽  
M Martinez-Corral ◽  
E Sanchez-Ortiga ◽  
A Doblas
Keyword(s):  
Optical Sectioning ◽  
Patterned Illumination

scholarly journals Two-photon patterned photostimulation with low-power, high-efficiency and reliable single-cell optogenetic control

2022 ◽  
Author(s):  
Yifan Wang ◽  
Yao Zheng ◽  
Yongxian Xu ◽  
Rongrong Li ◽  
Yameng Zheng ◽  
...  
Keyword(s):  
Low Power ◽  
Single Cell ◽  
Laser Power ◽  
High Efficiency ◽  
Excitation Density ◽  
Two Photon ◽  
Photon Excitation ◽  
Temporal Focusing ◽  
Patterned Illumination ◽  
Two Photon Excitation

Two-photon optogenetics enables selectively stimulating individual cells for manipulating neuronal ensembles. As the general photostimulation strategy, the patterned two-photon excitation has enabled millisecond-timescale activation for single or multiple neurons, but its activation efficiency is suffered from high laser power due to low beam-modulation efficiency. Here, we develop a high-efficiency beam-shaping method based on the Gerchberg-Saxton (GS) algorithm with spherical-distribution initial phase (GSSIP) to reduce the patterned two-photon excitation speckles and intensity. It can well control the phase of shaped beams to attain speckle-free accurate patterned illumination with an improvement of 44.21% in the modulation efficiency compared with that of the traditional GS algorithm. A combination of temporal focusing and the GSSIP algorithm (TF-GSSIP) achieves patterned focusing through 500-μm-thickness mouse brain slices, which is 2.5 times deeper than the penetration depth of TF-GS with the same signal-to-noise ratio (SNR). With our method, the laser power can be reduced to only 55.56% of that with traditional method (the temporal focusing with GS, TF-GS) to reliably evoke GCaMP6s response in C1V1-expressing cultured neurons with single-cell resolution. Besides, the photostimulation efficiency is remarkably increased by 80.19% at the same excitation density of 0.27 mW/μm2. This two-photon stimulation method with low-power, reliable and patterned illumination may pave the way for analyzing neural circuits and neural coding and decoding mechanism.

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