scholarly journals Compressive Sensing Hyperspectral Imaging by Spectral Multiplexing with Liquid Crystal

2018 ◽  
Vol 5 (1) ◽  
pp. 3 ◽  
Author(s):  
Yaniv Oiknine ◽  
Isaac August ◽  
Vladimir Farber ◽  
Daniel Gedalin ◽  
Adrian Stern
Keyword(s):  
Liquid Crystal ◽  
Compressive Sensing ◽  
Hyperspectral Imaging ◽  
Spectral Properties ◽  
Sensor Array ◽  
Spectral Imaging ◽  
Spectral Domain ◽  
Imaging Methods ◽  
Order Of Magnitude ◽  
Spectral Multiplexing

Hyperspectral (HS) imaging involves the sensing of a scene’s spectral properties, which are often redundant in nature. The redundancy of the information motivates our quest to implement Compressive Sensing (CS) theory for HS imaging. This article provides a review of the Compressive Sensing Miniature Ultra-Spectral Imaging (CS-MUSI) camera, its evolution, and its different applications. The CS-MUSI camera was designed within the CS framework and uses a liquid crystal (LC) phase retarder in order to modulate the spectral domain. The outstanding advantage of the CS-MUSI camera is that the entire HS image is captured from an order of magnitude fewer measurements of the sensor array, compared to conventional HS imaging methods.

scholarly journals Scaling-Based Two-Step Reconstruction in Full Polarization-Compressed Hyperspectral Imaging

Sensors ◽  
2020 ◽  
Vol 20 (24) ◽  
pp. 7120
Author(s):  
Axin Fan ◽  
Tingfa Xu ◽  
Xi Wang ◽  
Chang Xu ◽  
Yuhan Zhang
Keyword(s):  
Compressive Sensing ◽  
Hyperspectral Imaging ◽  
Imaging System ◽  
Optimization Method ◽  
Physicochemical Characteristics ◽  
Tunable Filter ◽  
Stokes Parameters ◽  
Quarter Wave Plate ◽  
Reconstruction Method ◽  
Order Of Magnitude

Polarized hyperspectral images can reflect the rich physicochemical characteristics of targets. Meanwhile, the contained plentiful information also brings great challenges to signal processing. Although compressive sensing theory provides a good idea for image processing, the simplified compression imaging system has difficulty in reconstructing full polarization information. Focused on this problem, we propose a two-step reconstruction method to handle polarization characteristics of different scales progressively. This paper uses a quarter-wave plate and a liquid crystal tunable filter to achieve full polarization compression and hyperspectral imaging. According to their numerical features, the Stokes parameters and their modulation coefficients are simultaneously scaled. The first Stokes parameter is reconstructed in the first step based on compressive sensing. Then, the last three Stokes parameters with similar order of magnitude are reconstructed in the second step based on previous results. The simulation results show that the two-step reconstruction method improves the reconstruction accuracy by 7.6 dB for the parameters that failed to be reconstructed by the non-optimized method, and reduces the reconstruction time by 8.25 h without losing the high accuracy obtained by the current optimization method. This feature scaling method provides a reference for the fast and high-quality reconstruction of physical quantities with obvious numerical differences.

scholarly journals Nanoscale hyperspectral imaging of tilted cholesteric liquid crystal structures

Soft Matter ◽  
2019 ◽  
Vol 15 (15) ◽  
pp. 3256-3263 ◽  
Author(s):  
Aurélie Jullien ◽  
Adriana Scarangella ◽  
Umberto Bortolozzo ◽  
Stefania Residori ◽  
Michel Mitov
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Crystal Structures ◽  
Hyperspectral Imaging ◽  
Spectral Properties ◽  
Cholesteric Liquid Crystal ◽  
Cholesteric Liquid Crystals

In tilted cholesteric liquid crystals, hyperspectral imaging reveals the correlation between the bandgap spectral properties and spatial twists.

scholarly journals Compressive Sensing Based Sampling and Reconstruction for Wireless Sensor Array Network

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Ming Yin ◽  
Kai Yu ◽  
Zhi Wang
Keyword(s):  
Compressive Sensing ◽  
Sensor Array ◽  
Superior Performance ◽  
Wireless Sensor ◽  
Prototype System ◽  
Reconstruction Method ◽  
Compressed Sampling ◽  
Data Volume ◽  
Simulation Results ◽  
Sparsity Structure

For low-power wireless systems, transmission data volume is a key property, which influences the energy cost and time delay of transmission. In this paper, we introduce compressive sensing to propose a compressed sampling and collaborative reconstruction framework, which enables real-time direction of arrival estimation for wireless sensor array network. In sampling part, random compressed sampling and 1-bit sampling are utilized to reduce sample data volume while making little extra requirement for hardware. In reconstruction part, collaborative reconstruction method is proposed by exploiting similar sparsity structure of acoustic signal from nodes in the same array. Simulation results show that proposed framework can reach similar performances as conventional DoA methods while requiring less than 15% of transmission bandwidth. Also the proposed framework is compared with some data compression algorithms. While simulation results show framework’s superior performance, field experiment data from a prototype system is presented to validate the results.

MWIR/LWIR filter based on Liquid–Crystal Fabry–Perot structure for tunable spectral imaging detection

2015 ◽  
Vol 69 ◽  
pp. 68-73 ◽  
Author(s):  
Huaidong Zhang ◽  
Afzal Muhammad ◽  
Jun Luo ◽  
Qing Tong ◽  
Yu Lei ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Spectral Imaging ◽  
Fabry Perot ◽  
Imaging Detection

scholarly journals Spectral Properties of 3-Benzanthrone Derivative Dyes in Isotropic Solvents, Polymer Film and Liquid Crystal

2001 ◽  
Vol 56 (3-4) ◽  
pp. 291-296 ◽  
Author(s):  
I. Grabchev ◽  
I. Moneva ◽  
E. Wolarz ◽  
D. Bauman ◽  
S. Stoyanov
Keyword(s):  
Liquid Crystal ◽  
Polymer Film ◽  
Spectral Properties ◽  
Anisotropic Media

Abstract Some recently synthesized benzanthrone derivatives bearing azomethine and oxy groups at C-3 po­ sition have been systematically studied. The influence of the substituents and of the environment (iso­ tropic and anisotropic media) on the absorption and fluorescence of the dyes and their vibronic transi­ tions is discussed in this paper.

Investigations of near IR photoluminescence properties in TiO2:Nd,Yb materials using hyperspectral imaging methods

2013 ◽  
Vol 140 ◽  
pp. 57-64 ◽  
Author(s):  
Edita Garskaite ◽  
Andreas S. Flø ◽  
Antonius T.J. van Helvoort ◽  
Aivaras Kareiva ◽  
Espen Olsen
Keyword(s):  
Hyperspectral Imaging ◽  
Photoluminescence Properties ◽  
Imaging Methods ◽  
Near Ir

scholarly journals Miniature Compressive Ultra-spectral Imaging System Utilizing a Single Liquid Crystal Phase Retarder

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Isaac August ◽  
Yaniv Oiknine ◽  
Marwan AbuLeil ◽  
Ibrahim Abdulhalim ◽  
Adrian Stern
Keyword(s):  
Liquid Crystal ◽  
Imaging System ◽  
Spectral Imaging ◽  
Crystal Phase ◽  
Liquid Crystal Phase
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