1,179 results match your criteria camera enables


Efficient vision ray calibration of multi-camera systems.

Opt Express 2021 May;29(11):17125-17139

Vision ray calibration provides imaging properties of cameras for application in optical metrology by identifying an independent vision ray for each sensor pixel. Due to this generic description of imaging properties, setups of multiple cameras can be considered as one imaging device. This enables holistic calibration of such setups with the same algorithm that is used for the calibration of a single camera. Read More

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A Portable Smartphone-Based Laryngoscope System for High-Speed Vocal Cord Imaging of Patients With Throat Disorders: Instrument Validation Study.

JMIR Mhealth Uhealth 2021 Jun 18;9(6):e25816. Epub 2021 Jun 18.

Biomedical Engineering Research Center, Asan Institute for Life Sciences, Asan Medical Center, Seoul, Republic of Korea.

Background: Currently, high-speed digital imaging (HSDI), especially endoscopic HSDI, is routinely used for the diagnosis of vocal cord disorders. However, endoscopic HSDI devices are usually large and costly, which limits access to patients in underdeveloped countries and in regions with inadequate medical infrastructure. Modern smartphones have sufficient functionality to process the complex calculations that are required for processing high-resolution images and videos with a high frame rate. Read More

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Measuring colloid-surface interaction forces in parallel using fluorescence centrifuge force microscopy.

Soft Matter 2021 Jun 17. Epub 2021 Jun 17.

Department of Chemical and Biological Engineering, Montana State University, Bozeman, MT, USA. and Center for Biofilm Engineering, Montana State University, Bozeman, MT, USA.

Interactions between colloidal-scale structures govern the physical properties of soft and biological materials, and knowledge of the forces associated with these interactions is critical for understanding and controlling these materials. A common approach to quantify colloidal interactions is to measure the interaction forces between colloids and a fixed surface. The centrifuge force microscope (CFM), a miniaturized microscope inside a centrifuge, is capable of performing hundreds of force measurements in parallel over a wide force range (10-2 to 104 pN), but CFM instruments are not widely used to measure colloid-surface interaction forces. Read More

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A novel theory of Asian elephant high-frequency squeak production.

BMC Biol 2021 Jun 17;19(1):121. Epub 2021 Jun 17.

Department of Behavioural and Cognitive Biology, Mammal Communication Lab, University of Vienna, Vienna, Austria.

Background: Anatomical and cognitive adaptations to overcome morpho-mechanical limitations of laryngeal sound production, where body size and the related vocal apparatus dimensions determine the fundamental frequency, increase vocal diversity across taxa. Elephants flexibly use laryngeal and trunk-based vocalizations to form a repertoire ranging from infrasonic rumbles to higher-pitched trumpets. Moreover, they are among the few evolutionarily distantly related animals (humans, pinnipeds, cetaceans, birds) capable of imitating species-atypical sounds. Read More

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A pilot study on automatic 3D quantification of Barrett's esophagus for risk stratification and therapy monitoring.

Gastroenterology 2021 Jun 8. Epub 2021 Jun 8.

Translational Gastroenterology Unit, Nuffield Department of Medicine, Experimental Medicine Div., John Radcliffe Hospital, University of Oxford, Oxford, UK;; Oxford NIHR Biomedical Research Centre, Oxford, UK;. Electronic address:

Background Aims: Barrett's epithelium measurement using widely accepted Prague C&M classification is highly operator dependent. We propose a novel methodology for measuring this risk score automatically. The method also enables quantification of the area of Barrett's epithelium (BEA) and islands which was not possible before. Read More

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Automated phenotyping of mosquito larvae enables high-throughput screening for novel larvicides and offers potential for smartphone-based detection of larval insecticide resistance.

PLoS Negl Trop Dis 2021 Jun 3;15(6):e0008639. Epub 2021 Jun 3.

UCL Centre for Respiratory Biology, UCL Respiratory, Division of Medicine, University College London, London, United Kingdom.

Pyrethroid-impregnated nets have contributed significantly to halving the burden of malaria but resistance threatens their future efficacy and the pipeline of new insecticides is short. Here we report that an invertebrate automated phenotyping platform (INVAPP), combined with the algorithm Paragon, provides a robust system for measuring larval motility in Anopheles gambiae (and An. coluzzi) as well as Aedes aegypti with the capacity for high-throughput screening for new larvicides. Read More

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Electricity-free chemical heater for isothermal nucleic acid amplification with applications in COVID-19 home testing.

Analyst 2021 Jun 1. Epub 2021 Jun 1.

Mechanical Engineering and Applied Mechanics, School of Engineering and Applied Science, University of Pennsylvania, Philadelphia, PA 19104, USA.

Molecular detection of pathogenic nucleic acids from patient samples requires incubating biochemical reactions at specific temperatures to amplify DNA. This incubation is typically carried out with an electrical heater and a temperature controller. To reduce test cost, to eliminate the need for manufacturing incubators, which may require significant time, and to enable electricity-free operation, we use energetic compounds such as an Mg(Fe) alloy mixed with a phase-change material (PCM) that undergoes phase transformation at the desired incubation temperature. Read More

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Sub-millimeter precise photon interaction position determination in large monolithic scintillators via convolutional neural network algorithms.

Phys Med Biol 2021 Jun 1. Epub 2021 Jun 1.

Faculty of Physics - Medical Physics, Ludwig-Maximilians-Universitaet Muenchen, Am Coulombwall 1, Garching, Bavaria, 85748, GERMANY.

In this work, we present the development and application of a Convolutional Neural Networks (CNN)-based algorithm to precisely determine the interaction position of γ-quanta in large monolithic scintillators. Those are used as an absorber component of a Compton Camera (CC) system under development for ion beam range verification via prompt gamma imaging. We examined two scintillation crystals: LaBr:Ce and CeBr. Read More

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Development of a Novel Web Camera-Based Contact-Free Major Depressive Disorder Screening System Using Autonomic Nervous Responses Induced by a Mental Task and Its Clinical Application.

Front Physiol 2021 14;12:642986. Epub 2021 May 14.

Graduate School of System Design, Tokyo Metropolitan University, Tokyo, Japan.

Background: To increase the consultation rate of potential major depressive disorder (MDD) patients, we developed a contact-type fingertip photoplethysmography-based MDD screening system. With the outbreak of SARS-CoV-2, we developed an alternative to contact-type fingertip photoplethysmography: a novel web camera-based contact-free MDD screening system (WCF-MSS) for non-contact measurement of autonomic transient responses induced by a mental task.

Methods: The WCF-MSS measures time-series interbeat intervals (IBI) by monitoring color tone changes in the facial region of interest induced by arterial pulsation using a web camera (1920 × 1080 pixels, 30 frames/s). Read More

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Manipulation for self-Identification, and self-Identification for better manipulation.

Sci Robot 2021 May;6(54)

Department of Mechanical Engineering and Material Science, Yale University, New Haven, CT, USA.

The process of modeling a series of hand-object parameters is crucial for precise and controllable robotic in-hand manipulation because it enables the mapping from the hand's actuation input to the object's motion to be obtained. Without assuming that most of these model parameters are known a priori or can be easily estimated by sensors, we focus on equipping robots with the ability to actively self-identify necessary model parameters using minimal sensing. Here, we derive algorithms, on the basis of the concept of virtual linkage-based representations (VLRs), to self-identify the underlying mechanics of hand-object systems via exploratory manipulation actions and probabilistic reasoning and, in turn, show that the self-identified VLR can enable the control of precise in-hand manipulation. Read More

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Three-dimensional dose-distribution measurement of therapeutic carbon-ion beams using a ZnS scintillator sheet.

J Radiat Res 2021 May 17. Epub 2021 May 17.

Graduate School of Medicine, Nagoya University, 1-1-20 Daiko-minami, Higashi-ku, Nagoya, Aichi 461-8673, Japan.

The accurate measurement of the 3D dose distribution of carbon-ion beams is essential for safe carbon-ion therapy. Although ionization chambers scanned in a water tank or air are conventionally used for this purpose, these measurement methods are time-consuming. We thus developed a rapid 3D dose-measurement tool that employs a silver-activated zinc sulfide (ZnS) scintillator with lower linear energy transfer (LET) dependence than gadolinium-based (Gd) scintillators; this tool enables the measurement of carbon-ion beams with small corrections. Read More

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CineScale: A dataset of cinematic shot scale in movies.

Data Brief 2021 Jun 20;36:107002. Epub 2021 Apr 20.

Department of Information Engineering, University of Brescia, via Branze 38, 25123, Brescia, Italy.

We provide a database containing shot scale annotations (i.e., the apparent distance of the camera from the subject of a filmed scene) for more than 792,000 image frames. Read More

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Single-shot detection of 8 unique monochrome fringe patterns representing 4 distinct directions via multispectral fringe projection profilometry.

Sci Rep 2021 May 14;11(1):10367. Epub 2021 May 14.

Imaging Program, Lawson Health Research Institute, St. Joseph's Health Care, London, ON, N6A 4V2, Canada.

Spatial resolution in three-dimensional fringe projection profilometry is determined in large part by the number and spacing of fringes projected onto an object. Due to the intensity-based nature of fringe projection profilometry, fringe patterns must be generated in succession, which is time-consuming. As a result, the surface features of highly dynamic objects are difficult to measure. Read More

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Reduced motion artifacts and speed improvements in enhanced line-scanning fiber bundle endomicroscopy.

J Biomed Opt 2021 May;26(5)

Univ. of Kent, United Kingdom.

Significance: Confocal laser scanning enables optical sectioning in fiber bundle endomicroscopy but limits the frame rate. To be able to better explore tissue morphology, it is useful to stitch sequentially acquired frames into a mosaic. However, low frame rates limit the maximum probe translation speed. Read More

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Robust super-resolution depth imaging via a multi-feature fusion deep network.

Opt Express 2021 Apr;29(8):11917-11937

The number of applications that use depth imaging is increasing rapidly, e.g. self-driving autonomous vehicles and auto-focus assist on smartphone cameras. Read More

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Analysis of facial expressions in response to basic taste stimuli using artificial intelligence to predict perceived hedonic ratings.

PLoS One 2021 4;16(5):e0250928. Epub 2021 May 4.

Department of Nutrition, Faculty of Health Sciences, Kio University, Nara, Japan.

Taste stimuli can induce a variety of physiological reactions depending on the quality and/or hedonics (overall pleasure) of tastants, for which objective methods have long been desired. In this study, we used artificial intelligence (AI) technology to analyze facial expressions with the aim of assessing its utility as an objective method for the evaluation of food and beverage hedonics compared with conventional subjective (perceived) evaluation methods. The face of each participant (10 females; age range, 21-22 years) was photographed using a smartphone camera a few seconds after drinking 10 different solutions containing five basic tastes with different hedonic tones. Read More

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Accuracy of noncontact surface imaging for tidal volume and respiratory rate measurements in the ICU.

J Clin Monit Comput 2021 Apr 22. Epub 2021 Apr 22.

LATIM INSERM UMR 1101, Université de Bretagne Occidentale, BREST, France.

Tidal volume monitoring may help minimize lung injury during respiratory assistance. Surface imaging using time-of-flight camera is a new, non-invasive, non-contact, radiation-free, and easy-to-use technique that enables tidal volume and respiratory rate measurements. The objectives of the study were to determine the accuracy of Time-of-Flight volume (VT) and respiratory rate (RR) measurements at the bedside, and to validate its application for spontaneously breathing patients under high flow nasal canula. Read More

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Reliability assessment of hyperspectral imaging with the HyperView™ system for lower extremity superficial tissue oxygenation in young healthy volunteers.

J Clin Monit Comput 2021 Apr 12. Epub 2021 Apr 12.

Department of Surgery, Division of Vascular Surgery, University Medical Center Groningen, University of Groningen, BA60, Hanzeplein 1, 9713 GZ, Groningen, The Netherlands.

Purpose: Hyperspectral imaging (HSI) is a noninvasive spectroscopy technique for determining superficial tissue oxygenation. The HyperView™ system is a hand-held camera that enables perfusion image acquisition. The evaluation of superficial tissue oxygenation is warranted in the evaluation of patients with peripheral arterial disease. Read More

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Radon alpha track counting on solid state nuclear track detector by an ImageJ-based software macro.

Appl Radiat Isot 2021 Jul 1;173:109695. Epub 2021 Apr 1.

Department of Applied Physics, University of Extremadura, Av. de la Universidad, s/n, 10005, Cáceres, Spain.

Radon (Rn) is a radioactive gas emanating from geological materials. Inhalation of this gas is closely related to an increase in the probability of lung cancer if the levels are high. The usual methodology for the quantification of radon by passive methods is the use of etched solid-state nuclear track detectors, frequently in combination with optical microscopes or image scanning for image acquisition and software-based image processing for track counting. Read More

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macroMS: Image-Guided Analysis of Random Objects by Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry.

J Am Soc Mass Spectrom 2021 May 6;32(5):1180-1188. Epub 2021 Apr 6.

Department of Energy Center for Advanced Bioenergy and Bioproducts Innovation, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States.

Mass spectrometry imaging is well-suited to characterizing sample surfaces for their chemical content in a spatially resolved manner. However, when the surface contains small objects with significant empty spaces between them, more efficient approaches to sample acquisition are possible. Image-guided mass spectrometry (MS) enables high-throughput analysis of a diverse range of sample types, such as microbial colonies, liquid microdroplets, and others, by recognizing and analyzing selected location targets in an image. Read More

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A transmitted-beam diagnostic for the wavelength-tunable UV drive beam on OMEGA.

Rev Sci Instrum 2021 Mar;92(3):033526

Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA.

A transmitted-beam diagnostic (P9TBD) was developed as part of a new experimental platform used to study laser-plasma interactions on OMEGA. Located in the opposing port to the wavelength-tunable (350 nm to 353 nm) UV drive beam, the P9TBD characterizes the beam after it propagates through an undersense plasma. The instrument consists of a large-aperture window that allows light to exit the target chamber and project onto a thin sheet of semi-transparent diffuser material. Read More

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Automatic Identification of Tool Wear Based on Thermography and a Convolutional Neural Network during the Turning Process.

Sensors (Basel) 2021 Mar 9;21(5). Epub 2021 Mar 9.

Faculty of Mechanical Engineering, University of Maribor, Smetanova ul. 17, 2000 Maribor, Slovenia.

This article presents a control system for a cutting tool condition supervision, which recognises tool wear automatically during turning. We used an infrared camera for process control, which-unlike common cameras-captures the thermographic state, in addition to the visual state of the process. Despite challenging environmental conditions (e. Read More

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Application of Innovative Methods of Predictive Control in Projects Involving Intelligent Steel Processing Production Systems.

Materials (Basel) 2021 Mar 27;14(7). Epub 2021 Mar 27.

Institute of Management, Industrial and Digital Engineering, Faculty of Mechanical Engineering, The Technical University of Košice, Letná 9, 040 01 Košice, Slovakia.

This paper describes the enhancement of the existing predictive system of quality management in the processes of metallurgic manufacturing. Specifically, it addresses steel-strip manufacturing. The main quality management innovation is the transition from the current methodological process of a single-step defect evaluation to a two-step evaluation. Read More

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Design and optimization of line-field optical coherence tomography at visible wavebands.

Biomed Opt Express 2021 Mar 9;12(3):1351-1365. Epub 2021 Feb 9.

Center for Biomedical Engineering, School of Engineering, Brown University, Providence, Rhode Island 02912, USA.

Parallel line-field Fourier-domain optical coherence tomography (LF-FDOCT) has emerged to enable relatively higher speeds than the conventional FDOCT system. In the LF-FDOCT, one B-scan is captured at a time instead of scanning the beam to acquire hundreds of A-scans. On the other hand, spectroscopic OCT using the visible waveband provides absorption information over multiple wavelengths at each voxel. Read More

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Fast, multiplane line-scan confocal microscopy using axially distributed slits.

Biomed Opt Express 2021 Mar 9;12(3):1339-1350. Epub 2021 Feb 9.

Department of Biomedical Engineering, Boston University, 44 Cummington Mall, Boston, MA 02215, USA.

The inherent constraints on resolution, speed and field of view have hindered the development of high-speed, three-dimensional microscopy techniques over large scales. Here, we present a multiplane line-scan imaging strategy, which uses a series of axially distributed reflecting slits to probe different depths within a sample volume. Our technique enables the simultaneous imaging of an optically sectioned image stack with a single camera at frame rates of hundreds of hertz, without the need for axial scanning. Read More

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A 3D Computer Vision-Guided Robotic Companion for Non-Contact Human Assistance and Rehabilitation.

J Intell Robot Syst 2020 Dec 21;100(3-4):911-923. Epub 2020 Sep 21.

Department of Mechanical Engineering, The University of Alabama.

With the rapid aging of the U.S. population, the mobility impairment is becoming a more and more challenging issue that affects a large number of individuals. Read More

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December 2020

Simultaneous spatiotemporal super-resolution and multi-parametric fluorescence microscopy.

Nat Commun 2021 03 19;12(1):1748. Epub 2021 Mar 19.

Department of Biological Sciences and NUS Centre for Bio-Imaging Sciences, National University of Singapore, Singapore, Singapore.

Super-resolution microscopy and single molecule fluorescence spectroscopy require mutually exclusive experimental strategies optimizing either temporal or spatial resolution. To achieve both, we implement a GPU-supported, camera-based measurement strategy that highly resolves spatial structures (~100 nm), temporal dynamics (~2 ms), and molecular brightness from the exact same data set. Simultaneous super-resolution of spatial and temporal details leads to an improved precision in estimating the diffusion coefficient of the actin binding polypeptide Lifeact and corrects structural artefacts. Read More

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Enhancing Film Education Learning Outcomes With Virtual Experiences.

IEEE Comput Graph Appl 2021 Mar-Apr;41(2):99-105

This article details a system titled "Camera as Mediator" that was built to aid undergraduate Film Studies students study camera placement and shot composition techniques. Learning how camera placement impacts a film is a common educational outcome in undergraduate Film Studies classes. However, building a controlled set with proper lighting, actors, and props is a cost- and time-prohibitive task in a typical introductory course. Read More

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Depth-of-field engineering in coded aperture imaging.

Opt Express 2021 Jan;29(2):1634-1648

Extending the depth-of-field (DOF) of an optical imaging system without effecting the other imaging properties has been an important topic of research for a long time. In this work, we propose a new general technique of engineering the DOF of an imaging system beyond just a simple extension of the DOF. Engineering the DOF means in this study that the inherent DOF can be extended to one, or to several, separated different intervals of DOF, with controlled start and end points. Read More

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January 2021

The Advantages of Indocyanine Green Fluorescence Imaging in Detecting and Treating Pediatric Hepatoblastoma: A Preliminary Experience.

Front Pediatr 2021 26;9:635394. Epub 2021 Feb 26.

Department of Pediatric Surgery, Asan Medical Center Children's Hospital, University of Ulsan College of Medicine, Seoul, South Korea.

Currently, indocyanine green (ICG) fluorescence imaging enables radical surgical resection in hepatoblastoma (HB) and has beneficial uses; however, its usage in pediatric patients is still limited. From 2015 to 2019, 17 hepatoblastoma patients underwent 22 fluorescence-guided surgery using ICG. ICG (0. Read More

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February 2021