Article
Radiology, Nuclear Medicine & Medical Imaging
Ouafa Sijilmassi, Jose-Manuel Lopez Alonso, Aurora Del Rio Sevilla, Maria del Carmen Barrio Asensio
Summary: In this study, a tissue diagnostic technique was developed using multispectral imaging in the visible spectrum combined with principal component analysis (PCA). The propagation of light through paraffin-embedded tissues was used to assess differences in eye tissues of control mouse embryos and embryos with maternal folic acid deficiency. The results showed vascular alterations in vitreous and choroid as well as texture alterations in lens and retina.
JOURNAL OF DIGITAL IMAGING
(2023)
Review
Ophthalmology
Feiyan Ma, Mingzhen Yuan, Igor Kozak
Summary: Multispectral imaging (MSI) is a unique layer-by-layer imaging technique that visualizes a wide range of retinal and choroidal pathologies. This article summarizes the imaging principles, applications, and recent advances of MSI. MSI detects reflectance signals from normal tissue and pathological lesions, and recent advancements include creating a retinal and choroidal oxy-deoxy map for understanding blood oxygen saturation within lesions and interpreting reflectance phenomena in MSI images.
SURVEY OF OPHTHALMOLOGY
(2023)
Article
Optics
Yoshihiro Maeda, Goki Tsukimura, Daisuke Sugimura, Takayuki Hamamoto
Summary: In this paper, a non-contact method for estimating the wetness of objects using multispectral near-infrared (NIR) imaging is proposed. The method enables accurate wetness estimation using few-band NIR images with coarse spectral resolution (40 nm intervals).
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2022)
Article
Biodiversity Conservation
Franziska Wolff, Tiina H. M. Kolari, Miguel Villoslada, Teemu Tahvanainen, Pasi Korpelainen, Pedro A. P. Zamboni, Timo Kumpula
Summary: Plant communities of mires are important for ecological processes such as carbon storage and gas fluxes. Mapping mire vegetation using UAVs can provide valuable information for ecosystem assessment. However, accurate mapping of plant communities remains challenging due to overlapping spectral signatures of plant species.
ECOLOGICAL INDICATORS
(2023)
Article
Dentistry, Oral Surgery & Medicine
M. Tejada-Casado, R. Ghinea, M. M. Perez, J. C. Cardona, A. M. Ionescu, H. Luebbe, L. J. Herrera
Summary: The aim of this study was to evaluate the accuracy of a PCA-based method for reflectance reconstruction and color estimation of dental resin-based composites with different thicknesses. The results showed that the two proposed PCA models allowed for accurate prediction of the spectral reflectance and color of layered dental resin-based composites with different shades and thicknesses.
Article
Dentistry, Oral Surgery & Medicine
Maria Tejada-Casado, Razvan Ghinea, Maria M. Perez, Henning Lubbe, Ioana S. Pop-Ciutrila, Javier Ruiz-Lopez, Luis Javier Herrera
Summary: By utilizing Principal Component Analysis (PCA), the accuracy of reflectance reconstruction and color estimation for different dental materials with varying thicknesses can be effectively assessed. The proposed PCA-based algorithm demonstrates its ability to predict the reflectance spectrum and color of monolithic dental samples, offering potential benefits for optimizing dental material manufacturing processes and enhancing chromatic accuracy in clinical dental restorations.
Article
Plant Sciences
Tomislav Javornik, Klaudija Carovic-Stanko, Jerko Gunjaca, Monika Vidak, Boris Lazarevic
Summary: In this study, high-throughput phenotyping methods were used to monitor the development of drought-induced morphological and physiological symptoms in common bean. The study aimed to select the most sensitive plant phenotypic traits to drought. The results showed that D30 treatment caused a decrease in leaf area index, total leaf area, reflectance in specific green, saturation, and green leaf index, and an increase in the anthocyanin index and reflectance in blue. These selected phenotypic traits could be used to monitor drought stress and screen for tolerant genotypes.
Article
Medicine, General & Internal
Yihua Zhu, Chung Ng, Oanh Le, Yi-Ching Ho, Daniel Fried
Summary: The aim of this clinical study was to compare the diagnostic performance of dual short wavelength infrared (SWIR) occlusal transillumination and reflectance multispectral imaging with conventional visual assessment and radiography for caries detection. The study showed that SWIR imaging had higher sensitivity for caries detection on proximal and occlusal surfaces compared to conventional methods. Reflectance imaging at 1600 nm was more sensitive and specific than transillumination at 1300 nm. The combined SWIR methods had higher specificity but lower sensitivity than each individual method.
Article
Medicine, General & Internal
Szabolcs Bozsanyi, Klara Farkas, Andras Banvolgyi, Kende Lorincz, Luca Fesus, Palma Anker, Sara Zakarias, Antal Jobbagy, Ilze Lihacova, Alexey Lihachev, Marta Lange, Dmitrijs Bliznuks, Marta Medvecz, Norbert Kiss, Norbert M. Wikonkal
Summary: The study used multispectral imaging to differentiate between melanoma and seborrheic keratosis, analyzing intensity descriptors of acquired images including ratios of intensity values of different channels, standard deviation, and minimum/ maximum values of lesion intensity, and assessing lesion pattern using particle analysis. The results showed significantly higher intensity values in seborrheic keratosis compared to melanoma, especially with autofluorescence imaging.
Article
Multidisciplinary Sciences
Dragana Bartolic, Dragosav Mutavdzic, Jens Michael Carstensen, Slavica Stankovic, Milica Nikolic, Sasa Krstovic, Ksenija Radotic
Summary: In this preliminary study, optical techniques were used to discriminate aflatoxin-contaminated maize seeds from uncontaminated seeds. The results showed high accuracy in classifying contaminated and uncontaminated seeds, providing valuable information for the assessment of seed adulteration and food safety.
SCIENTIFIC REPORTS
(2022)
Article
Geography, Physical
Kathrin Maier, Andrea Nascetti, Ward van Pelt, Gunhild Rosqvist
Summary: This study proposes a novel method to determine the spatial distribution of snow depth in challenging alpine terrains using a combination of a multispectral camera and a UAV. The method enables fast, reliable, and affordable measurement of high-resolution 3D snow-covered surface models. The experiments suggest that the red components in the electromagnetic spectrum are crucial in photogrammetric processing, and applying Principal Component Analysis can reduce processing times and computational resources.
ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING
(2022)
Article
Spectroscopy
M. Perez, E. Arroyo-Lemus, J. L. Ruvalcaba-Sil, A. Mitrani, M. A. Maynez-Rojas, O. G. de Lucio
Summary: This paper presents a combination of noninvasive techniques for studying the superimposed painting stages in The Pentecost, a Mexican Colonial panel painting attributed to Baltasar de Echave Orio. By using reflected hyperspectral imaging, ultraviolet fluorescence photography, X-ray radiography, fiber optic reflectance spectroscopy, and X-ray fluorescence spectroscopy, the research provides new insights into the painting's making process and the artist's materials.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Geochemistry & Geophysics
Weijie Chen, Zhenhong Jia, Jie Yang, Nikola K. Kasabov
Summary: A method of multispectral image enhancement based on improved WPCA and IFD filtering is proposed in this paper. By selecting appropriate bands, compensating each band, introducing a mask, and adjusting brightness values, the method achieves enhancement of multispectral images, and experimental results demonstrate its superiority.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
Article
Chemistry, Analytical
Jingwen Li, Yanting Wang, Lixing Yao, Cong Wang, Li Shen
Summary: In this study, laser-induced breakdown spectroscopy (LIBS) was used to analyze the elemental composition of Tieguanyin tea and lead chrome green (LCG). The presence of Fe, Ca, and Mg were found in both LCG and tea, while Cr, Pb, and Cu were unique to LCG and elements such as Na, K, Al, Si, Mn, and Sr were unique to tea. The study also investigated the free radicals in LIBS spectra of tea and LCG-tea samples. Additionally, the spectral line intensities of Pb atoms and CN free radicals were utilized to detect the illegal addition of LCG in tea qualitatively. Principal component analysis (PCA) was then performed using CN and CaO spectral lines, which effectively differentiated ordinary tea from LCG-tea with a cumulative contribution rate increasing from 90.7% to 99.4%.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2023)
Article
Chemistry, Analytical
Yunhe Zhang, Yixin Lu, Zhanqin Zhang, Zhuowen Liang, Qianqian Xiao, Kaijian Shao, Yu Wang, Jiawei Zhang, Shuang Wang
Summary: Accurate assessment of blood content in biological tissues is crucial for diagnosing and monitoring various diseases. A multispectral endoscopic imaging system was developed to capture tissue reflection optical images and evaluate blood content and tissue composition using spectral analysis algorithm.
ANALYTICAL METHODS
(2023)
Article
Optics
Virendra N. Mahajan, Jose A. Diaz
Article
Mechanics
Jose M. Medina, Jose A. Diaz
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2016)
Editorial Material
Optics
Jose A. Diaz
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2016)
Article
Physics, Multidisciplinary
Jose M. Medina, Jose A. Diaz
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2016)
Article
Optics
Jose A. Diaz, Jose M. Medina
Review
Chemistry, Applied
Jose M. Medina, Jose A. Diaz
PROGRESS IN ORGANIC COATINGS
(2017)
Article
Mathematics, Applied
J. Calatayud, J-C Cortes, J. A. Diaz, M. Jornet
STOCHASTICS-AN INTERNATIONAL JOURNAL OF PROBABILITY AND STOCHASTIC PROCESSES
(2020)
Editorial Material
Optics
Jose A. Diaz
OPTICS AND LASER TECHNOLOGY
(2020)
Article
Mathematics, Applied
J. Calatayud, J. -C. Cortes, J. A. Diaz, M. Jornet
APPLIED NUMERICAL MATHEMATICS
(2020)
Correction
Mechanics
Jose M. Medina, Jose A. Diaz
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2020)
Article
Physics, Multidisciplinary
Jose M. Medina, Jose A. Diaz
Summary: A random multiplicative model of human reaction/response times based on the power-law function Pieron's law is presented in the study. The role of weak additive noise in two different scenarios is investigated, leading to a U-shaped function of reaction times with implications for decision making and neural control.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2021)
Article
Optics
Jose A. Diaz, Rafael Navarro
Summary: We studied different pupil sampling patterns to calculate the optical transfer function of non-diffraction limited optical imaging systems in the low range of spatial frequencies. We compared the diffraction and geometric optical transfer functions to find a sampling pattern that accurately calculates the latter with less than 5% difference and fewer sampling points. The non-redundant spiral pupil sampling was found to be the best choice, which is valuable for optimizing or characterizing optical imaging systems in the non-diffraction limited range using raytracing.
Proceedings Paper
Optics
Jose Antonio Diaz, Virendra N. Mahajan
CURRENT DEVELOPMENTS IN LENS DESIGN AND OPTICAL ENGINEERING XVIII
(2017)
Article
Optics
Jose A. Diaz, Virendra N. Mahajan
Article
Physics, Fluids & Plasmas
Jose M. Medina, Jose A. Diaz