keyword
MENU ▼
Read by QxMD icon Read
search

hyperspectral imaging

keyword
https://www.readbyqxmd.com/read/28100066/identification-of-eggs-from-different-production-systems-based-on-hyperspectra-and-cs-svm
#1
J Sun, S Cong, H Mao, X Zhou, X Wu, X Zhang
1. To identify the origin of table eggs more accurately, a method based on hyperspectral imaging technology was studied. 2. The hyperspectral data of 200 samples of intensive and extensive eggs were collected. Standard normalised variables (SNV) combined with Savitzky-Golay (SG) were used to eliminate noise, then stepwise regression (SWR) was used for feature selection. Grid search algorithm (GS), genetic search algorithm (GA), particle swarm optimisation algorithm (PSO) and cuckoo search algorithm (CS) were applied by support vector machine (SVM) to establish a SVM identification model with the optimal parameters...
January 19, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28081096/pump-probe-micro-spectroscopy-by-means-of-an-ultra-fast-acousto-optics-delay-line
#2
Xavier Audier, Naveen Balla, Hervé Rigneault
We demonstrate femtosecond pump-probe transient absorption spectroscopy using a programmable dispersive filter as an ultra-fast delay line. Combined with fast synchronous detection, this delay line allows for recording of 6 ps decay traces at 34 kHz. With such acquisition speed, we perform single point pump-probe spectroscopy on bulk samples in 80 μs and hyperspectral pump-probe imaging over a field of view of 100 μm in less than a second. The usability of the method is illustrated in a showcase experiment to image and discriminate between two pigments in a mixture...
January 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28068315/hyperspectral-phasor-analysis-enables-multiplexed-5d-in-vivo-imaging
#3
Francesco Cutrale, Vikas Trivedi, Le A Trinh, Chi-Li Chiu, John M Choi, Marcela S Artiga, Scott E Fraser
Time-lapse imaging of multiple labels is challenging for biological imaging as noise, photobleaching and phototoxicity compromise signal quality, while throughput can be limited by processing time. Here, we report software called Hyper-Spectral Phasors (HySP) for denoising and unmixing multiple spectrally overlapping fluorophores in a low signal-to-noise regime with fast analysis. We show that HySP enables unmixing of seven signals in time-lapse imaging of living zebrafish embryos.
January 9, 2017: Nature Methods
https://www.readbyqxmd.com/read/28067764/high-resolution-temperature-measurement-of-liquid-stainless-steel-using-hyperspectral-imaging
#4
Wim Devesse, Dieter De Baere, Patrick Guillaume
A contactless temperature measurement system is presented based on a hyperspectral line camera that captures the spectra in the visible and near infrared (VNIR) region of a large set of closely spaced points. The measured spectra are used in a nonlinear least squares optimization routine to calculate a one-dimensional temperature profile with high spatial resolution. Measurements of a liquid melt pool of AISI 316L stainless steel show that the system is able to determine the absolute temperatures with an accuracy of 10%...
January 5, 2017: Sensors
https://www.readbyqxmd.com/read/28059326/augmented-design-and-analysis-of-computer-experiments-a-novel-tolerance-embedded-global-optimization-approach-applied-to-swir-hyperspectral-illumination-design
#5
Janos C Keresztes, R John Koshel, Karlien D'huys, Bart De Ketelaere, Jan Audenaert, Peter Goos, Wouter Saeys
A novel meta-heuristic approach for minimizing nonlinear constrained problems is proposed, which offers tolerance information during the search for the global optimum. The method is based on the concept of design and analysis of computer experiments combined with a novel two phase design augmentation (DACEDA), which models the entire merit space using a Gaussian process, with iteratively increased resolution around the optimum. The algorithm is introduced through a series of cases studies with increasing complexity for optimizing uniformity of a short-wave infrared (SWIR) hyperspectral imaging (HSI) illumination system (IS)...
December 26, 2016: Optics Express
https://www.readbyqxmd.com/read/28054947/hyperspectral-imagery-super-resolution-by-adaptive-pocs-and-blur-metric
#6
Shaoxing Hu, Shuyu Zhang, Aiwu Zhang, Shatuo Chai
The spatial resolution of a hyperspectral image is often coarse as the limitations on the imaging hardware. A novel super-resolution reconstruction algorithm for hyperspectral imagery (HSI) via adaptive projection onto convex sets and image blur metric (APOCS-BM) is proposed in this paper to solve these problems. Firstly, a no-reference image blur metric assessment method based on Gabor wavelet transform is utilized to obtain the blur metric of the low-resolution (LR) image. Then, the bound used in the APOCS is automatically calculated via LR image blur metric...
January 3, 2017: Sensors
https://www.readbyqxmd.com/read/28053649/predicting-grain-yield-using-canopy-hyperspectral-reflectance-in-wheat-breeding-data
#7
Osval A Montesinos-López, Abelardo Montesinos-López, José Crossa, Gustavo de Los Campos, Gregorio Alvarado, Mondal Suchismita, Jessica Rutkoski, Lorena González-Pérez, Juan Burgueño
BACKGROUND: Modern agriculture uses hyperspectral cameras to obtain hundreds of reflectance data measured at discrete narrow bands to cover the whole visible light spectrum and part of the infrared and ultraviolet light spectra, depending on the camera. This information is used to construct vegetation indices (VI) (e.g., green normalized difference vegetation index or GNDVI, simple ratio or SRa, etc.) which are used for the prediction of primary traits (e.g., biomass). However, these indices only use some bands and are cultivar-specific; therefore they lose considerable information and are not robust for all cultivars...
2017: Plant Methods
https://www.readbyqxmd.com/read/28041894/lipid-desaturation-is-a-metabolic-marker-and-therapeutic-target-of-ovarian-cancer-stem-cells
#8
Junjie Li, Salvatore Condello, Jessica Thomes-Pepin, Xiaoxiao Ma, Yu Xia, Thomas D Hurley, Daniela Matei, Ji-Xin Cheng
Lack of sensitive single-cell analysis tools has limited the characterization of metabolic activity in cancer stem cells. By hyperspectral-stimulated Raman scattering imaging of single living cells and mass spectrometry analysis of extracted lipids, we report here significantly increased levels of unsaturated lipids in ovarian cancer stem cells (CSCs) as compared to non-CSCs. Higher lipid unsaturation levels were also detected in CSC-enriched spheroids compared to monolayer cultures of ovarian cancer cell lines or primary cells...
December 8, 2016: Cell Stem Cell
https://www.readbyqxmd.com/read/28040950/artifacts-reduction-in-vir-dawn-data
#9
F G Carrozzo, A Raponi, M C De Sanctis, E Ammannito, M Giardino, E D'Aversa, S Fonte, F Tosi
Remote sensing images are generally affected by different types of noise that degrade the quality of the spectral data (i.e., stripes and spikes). Hyperspectral images returned by a Visible and InfraRed (VIR) spectrometer onboard the NASA Dawn mission exhibit residual systematic artifacts. VIR is an imaging spectrometer coupling high spectral and spatial resolutions in the visible and infrared spectral domain (0.25-5.0 μm). VIR data present one type of noise that may mask or distort real features (i.e., spikes and stripes), which may lead to misinterpretation of the surface composition...
December 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28005671/hyperspectral-autofluorescence-imaging-of-drusen-and-retinal-pigment-epithelium-in-donor-eyes-with-age-related-macular-degeneration
#10
Yuehong Tong, Tal Ben Ami, Sungmin Hong, Rainer Heintzmann, Guido Gerig, Zsolt Ablonczy, Christine A Curcio, Thomas Ach, R Theodore Smith
PURPOSE: To elucidate the molecular pathogenesis of age-related macular degeneration (AMD) and interpretation of fundus autofluorescence imaging, the authors identified spectral autofluorescence characteristics of drusen and retinal pigment epithelium (RPE) in donor eyes with AMD. METHODS: Macular RPE/Bruch membrane flat mounts were prepared from 5 donor eyes with AMD. In 12 locations (1-3 per eye), hyperspectral autofluorescence images in 10-nm-wavelength steps were acquired at 2 excitation wavelengths (λex 436, 480 nm)...
December 2016: Retina
https://www.readbyqxmd.com/read/28001153/digital-de-waxing-on-ftir-images
#11
Fabrício Augusto de Lima, Cyril Gobinet, Ganesh Sockalingum, Sérgio Britto Garcia, Michel Manfait, Valérie Untereiner, Olivier Piot, Luciano Bachmann
This paper presents a procedure that digitally neutralizes the contribution of paraffin to FTIR hyperspectral images. A brief mathematical derivation of the procedure is demonstrated and applied on one normal human colon sample to exemplify the de-waxing procedure. The proposed method includes construction of a paraffin model based on PCA, EMSC normalization and application of two techniques for spectral quality control. We discuss every step in which the researcher needs to take a subjective decision during the de-waxing procedure, and we explain how to make an adequate choice of parameters involved...
December 21, 2016: Analyst
https://www.readbyqxmd.com/read/27999294/phase-and-index-of-refraction-imaging-by-hyperspectral-reflectance-confocal-microscopy
#12
Stefano Selci
A hyperspectral reflectance confocal microscope (HSCM) was realized by CNR-ISC (Consiglio Nazionale delle Ricerche-Istituto dei Sistemi Complessi) a few years ago. The instrument and data have been already presented and discussed. The main activity of this HSCM has been within biology, and reflectance data have shown good matching between spectral signatures and the nature or evolution on many types of cells. Such a relationship has been demonstrated mainly with statistical tools like Principal Component Analysis (PCA), or similar concepts, which represent a very common approach for hyperspectral imaging...
December 16, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27999259/data-field-modeling-and-spectral-spatial-feature-fusion-for-hyperspectral-data-classification
#13
Da Liu, Jianxun Li
Classification is a significant subject in hyperspectral remote sensing image processing. This study proposes a spectral-spatial feature fusion algorithm for the classification of hyperspectral images (HSI). Unlike existing spectral-spatial classification methods, the influences and interactions of the surroundings on each measured pixel were taken into consideration in this paper. Data field theory was employed as the mathematical realization of the field theory concept in physics, and both the spectral and spatial domains of HSI were considered as data fields...
December 16, 2016: Sensors
https://www.readbyqxmd.com/read/27979190/chemical-spoilage-extent-traceability-of-two-kinds-of-processed-pork-meats-using-one-multispectral-system-developed-by-hyperspectral-imaging-combined-with-effective-variable-selection-methods
#14
Weiwei Cheng, Da-Wen Sun, Hongbin Pu, Qingyi Wei
The feasibility of hyperspectral imaging (HSI) (400-1000nm) for tracing the chemical spoilage extent of the raw meat used for two kinds of processed meats was investigated. Calibration models established separately for salted and cooked meats using full wavebands showed good results with the determination coefficient in prediction (R(2)P) of 0.887 and 0.832, respectively. For simplifying the calibration models, two variable selection methods were used and compared. The results showed that genetic algorithm-partial least squares (GA-PLS) with as much continuous wavebands selected as possible always had better performance...
April 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27979147/evaluation-of-the-influence-of-white-grape-seed-extracts-as-copigment-sources-on-the-anthocyanin-extraction-from-grape-skins-previously-classified-by-near-infrared-hyperspectral-tools
#15
Julio Nogales-Bueno, Berta Baca-Bocanegra, María José Jara-Palacios, José Miguel Hernández-Hierro, Francisco José Heredia
Hyperspectral imaging has been used to classify red grapes (Vitis vinifera L.) according to their predicted extractable total anthocyanin content (i.e. extractable total anthocyanin content determined by a hyperspectral method). Low, medium and high levels of predicted extractable total anthocyanin content were established. Then, grape skins were split into three parts and each part was macerated into a different model wine solution for a three-day period. Wine model solutions were made up with different concentration of copigments coming from white grape seeds...
April 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27958386/detection-of-fungus-infection-on-petals-of-rapeseed-brassica-napus-l-using-nir-hyperspectral-imaging
#16
Yan-Ru Zhao, Ke-Qiang Yu, Xiaoli Li, Yong He
Infected petals are often regarded as the source for the spread of fungi Sclerotinia sclerotiorum in all growing process of rapeseed (Brassica napus L.) plants. This research aimed to detect fungal infection of rapeseed petals by applying hyperspectral imaging in the spectral region of 874-1734 nm coupled with chemometrics. Reflectance was extracted from regions of interest (ROIs) in the hyperspectral image of each sample. Firstly, principal component analysis (PCA) was applied to conduct a cluster analysis with the first several principal components (PCs)...
December 13, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27933263/manifold-regularization-for-sparse-unmixing-of-hyperspectral-images
#17
Junmin Liu, Chunxia Zhang, Jiangshe Zhang, Huirong Li, Yuelin Gao
BACKGROUND: Recently, sparse unmixing has been successfully applied to spectral mixture analysis of remotely sensed hyperspectral images. Based on the assumption that the observed image signatures can be expressed in the form of linear combinations of a number of pure spectral signatures known in advance, unmixing of each mixed pixel in the scene is to find an optimal subset of signatures in a very large spectral library, which is cast into the framework of sparse regression. However, traditional sparse regression models, such as collaborative sparse regression, ignore the intrinsic geometric structure in the hyperspectral data...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27930773/penetration-depth-of-photons-in-biological-tissues-from-hyperspectral-imaging-in-shortwave-infrared-in-transmission-and-reflection-geometries
#18
Hairong Zhang, Daniel Salo, David M Kim, Sergey Komarov, Yuan-Chuan Tai, Mikhail Y Berezin
No abstract text is available yet for this article.
December 1, 2016: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/27930718/seeing-the-invisible-revealing-atrial-ablation-lesions-using-hyperspectral-imaging-approach
#19
Narine Muselimyan, Luther M Swift, Huda Asfour, Tigran Chahbazian, Ramesh Mazhari, Marco A Mercader, Narine A Sarvazyan
BACKGROUND: Currently, there are limited means for high-resolution monitoring of tissue injury during radiofrequency ablation procedures. OBJECTIVE: To develop the next generation of visualization catheters that can reveal irreversible atrial muscle damage caused by ablation and identify viability gaps between the lesions. METHODS: Radiofrequency lesions were placed on the endocardial surfaces of excised human and bovine atria and left ventricles of blood perfused rat hearts...
2016: PloS One
https://www.readbyqxmd.com/read/27929391/a-hyperspectral-survey-of-new-york-city-lighting-technology
#20
Gregory Dobler, Masoud Ghandehari, Steven E Koonin, Mohit S Sharma
Using side-facing observations of the New York City (NYC) skyline, we identify lighting technologies via spectral signatures measured with Visible and Near Infrared (VNIR) hyperspectral imaging. The instrument is a scanning, single slit spectrograph with 872 spectral channels from 0.4-1.0 μ m. With a single scan, we are able to clearly match the detected spectral signatures of 13 templates of known lighting types. However, many of the observed lighting spectra do not match those that have been measured in the laboratory...
December 5, 2016: Sensors
keyword
keyword
67247
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"