scholarly journals Compressive spectral imaging approach using adaptive coded apertures

2020 ◽  
Vol 59 (7) ◽  
pp. 1924
Author(s):  
Hao Zhang ◽  
Xu Ma ◽  
Gonzalo R. Arce
Keyword(s):  
Spectral Imaging ◽  
Imaging Approach ◽  
Coded Apertures

Snapshot Compressive ToF+Spectral Imaging via Optimized Color-Coded Apertures

2020 ◽  
Vol 42 (10) ◽  
pp. 2346-2360 ◽  
Author(s):  
Hoover Rueda-Chacon ◽  
Juan F. Florez-Ospina ◽  
Daniel L. Lau ◽  
Gonzalo R. Arce
Keyword(s):  
Spectral Imaging ◽  
Coded Apertures

Snapshot compressive spectral imaging based on adaptive coded apertures

2018 ◽  
Author(s):  
Xu Ma ◽  
Hao Zhang ◽  
Xiao Ma ◽  
Gonzalo R. Arce ◽  
Tingfa Xu ◽  
...  
Keyword(s):  
Spectral Imaging ◽  
Coded Apertures

Simultaneous measurement of intracellular pH and Ca2+ in insulin-secreting cells by spectral imaging microscopy

1996 ◽  
Vol 270 (5) ◽  
pp. C1438-C1446 ◽  
Author(s):  
R. Martinez-Zaguilan ◽  
M. W. Gurule ◽  
R. M. Lynch
Keyword(s):  
Intracellular Ph ◽  
Single Cells ◽  
Ion Homeostasis ◽  
Spectral Imaging ◽  
Charge Coupled Device ◽  
Fura 2 ◽  
Imaging Approach ◽  
Insulin Secreting Cells ◽  
A Cell ◽  
Cytosolic Acidification

Described is a microscopic spectral imaging approach to monitor pH and Ca2+ simultaneously from combined spectra of multiple ion indicators. Emitted light from a cell is focused onto a grating spectrograph and spectra are imaged with a cooled charge-coupled device camera. The combined spectral output of fura 2 and SNARF-1 was analyzed to follow changes in intracellular Ca2+ concentration ([Ca2+]i) and intracellular pH (pHi) simultaneously and to correct the Ca2+ signal for concurrent changes in pHi. Responses of individual hamster insulinoma (HIT-T15) cells to effectors of ion homeostasis were heterogeneous. Treatment with NH4Cl increased pHi and transiently increased [Ca2+]i. Removal of NH4Cl induced cytosolic acidification concomitant with either no change or sustained increases in [Ca2-]i. Glucose treatment generally resulted in rapid and sustained increases in both [Ca2+]i and pHi but also heterogeneous pHi and [Ca2+]i responses. Corrections of the fura 2 signal for pH were important for following Ca2+ transitions elicited by NH4Cl but were less important for glucose-induced responses. The spectral imaging microscope provides a sensitive method for simultaneous measurements of pHi and [Ca2+]i in single cells.

scholarly journals High-dynamic range compressive spectral imaging by grayscale coded aperture adaptive filtering

2015 ◽  
Vol 35 (3) ◽  
pp. 53-60 ◽  
Author(s):  
Nelson Eduardo Diaz ◽  
Hoover Fabian Rueda Chacon ◽  
Henry Arguello Fuentes
Keyword(s):  
Dynamic Range ◽  
Imaging System ◽  
Three Dimensional ◽  
Spectral Imaging ◽  
Reconstruction Algorithm ◽  
High Dynamic Range ◽  
Data Cube ◽  
Coded Aperture ◽  
Coded Apertures

<p class="p1">The coded aperture snapshot spectral imaging system (CASSI) is an imaging architecture which senses the three dimensional informa-tion of a scene with two dimensional (2D) focal plane array (FPA) coded projection measurements. A reconstruction algorithm takes advantage of the compressive measurements sparsity to recover the underlying 3D data cube. Traditionally, CASSI uses block-un-block coded apertures (BCA) to spatially modulate the light. In CASSI the quality of the reconstructed images depends on the design of these coded apertures and the FPA dynamic range. This work presents a new CASSI architecture based on grayscaled coded apertu-res (GCA) which reduce the FPA saturation and increase the dynamic range of the reconstructed images. The set of GCA is calculated in a real-time adaptive manner exploiting the information from the FPA compressive measurements. Extensive simulations show the attained improvement in the quality of the reconstructed images when GCA are employed.  In addition, a comparison between traditional coded apertures and GCA is realized with respect to noise tolerance.</p>

Spectral Imaging Approach to Evaluate Degree of Tea Fermentation by Total Catechins

2010 ◽  
Author(s):  
Suming Chen ◽  
Sheng-Jie Luo ◽  
Yu-Liang Chen ◽  
Yung-Kun Chuang ◽  
Chao-Yin Tsai ◽  
...  
Keyword(s):  
Spectral Imaging ◽  
Imaging Approach

scholarly journals Compressive Spectral Imaging Based on Hexagonal Blue Noise Coded Apertures

2020 ◽  
Vol 6 ◽  
pp. 749-763
Author(s):  
Hao Zhang ◽  
Xu Ma ◽  
Daniel L. Lau ◽  
Jianchen Zhu ◽  
Gonzalo R. Arce
Keyword(s):  
Spectral Imaging ◽  
Blue Noise ◽  
Coded Apertures
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