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https://www.readbyqxmd.com/read/29353330/leveraging-variable-sensor-spatial-acuity-with-a-homogeneous-multi-scale-place-recognition-framework
#1
Adam Jacobson, Zetao Chen, Michael Milford
Most robot navigation systems perform place recognition using a single-sensor modality and one, or at most two heterogeneous map scales. In contrast, mammals perform navigation by combining sensing from a wide variety of modalities including vision, auditory, olfactory and tactile senses with a multi-scale, homogeneous neural map of the environment. In this paper, we develop a multi-scale, multi-sensor system for mapping and place recognition that combines spatial localization hypotheses at different spatial scales from multiple different sensors to calculate an overall place recognition estimate...
January 20, 2018: Biological Cybernetics
https://www.readbyqxmd.com/read/29353091/adding-vibrotactile-feedback-to-a-myoelectric-controlled-hand-improves-performance-when-online-visual-feedback-is-disturbed
#2
Eitan Raveh, Sigal Portnoy, Jason Friedman
We investigated whether adding vibrotactile feedback to a myoelectric-controlled hand, when visual feedback is disturbed, can improve performance during a functional test. For this purpose, able-bodied subjects, activating a myoelectric-controlled hand attached to their right hand performed the modified Box & Blocks test, grasping and manipulating wooden blocks over a partition. This was performed in 3 conditions, using a repeated-measures design: in full light, in a dark room where visual feedback was disturbed and no auditory feedback - one time with the addition of tactile feedback provided during object grasping and manipulation, and one time without any tactile feedback...
January 17, 2018: Human Movement Science
https://www.readbyqxmd.com/read/29352136/gphenovision-a-ground-mobile-system-with-multi-modal-imaging-for-field-based-high-throughput-phenotyping-of-cotton
#3
Yu Jiang, Changying Li, Jon S Robertson, Shangpeng Sun, Rui Xu, Andrew H Paterson
Imaging sensors can extend phenotyping capability, but they require a system to handle high-volume data. The overall goal of this study was to develop and evaluate a field-based high throughput phenotyping system accommodating high-resolution imagers. The system consisted of a high-clearance tractor and sensing and electrical systems. The sensing system was based on a distributed structure, integrating environmental sensors, real-time kinematic GPS, and multiple imaging sensors including RGB-D, thermal, and hyperspectral cameras...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29351736/studying-medical-communication-with-video-vignettes-a-randomized-study-on-how-variations-in-video-vignette-introduction-format-and-camera-focus-influence-analogue-patients-engagement
#4
Leonie N C Visser, Nadine Bol, Marij A Hillen, Mathilde G E Verdam, Hanneke C J M de Haes, Julia C M van Weert, Ellen M A Smets
BACKGROUND: Video vignettes are used to test the effects of physicians' communication on patient outcomes. Methodological choices in video-vignette development may have far-stretching consequences for participants' engagement with the video, and thus the ecological validity of this design. To supplement the scant evidence in this field, this study tested how variations in video-vignette introduction format and camera focus influence participants' engagement with a video vignette showing a bad news consultation...
January 19, 2018: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/29351718/good-versus-good-enough-empirical-tests-of-methane-leak-detection-sensitivity-of-a-commercial-infrared-camera
#5
Arvind P Ravikumar, Jingfan Wang, Mike McGuire, Clay S Bell, Daniel Zimmerle, Adam R Brandt
Methane - a key component of natural gas - is a potent greenhouse gas. A key feature of recent methane mitigation policies is the use of periodic leak detection surveys, typically done with optical gas imaging (OGI) technologies. The most common OGI technology is an infrared camera. In this work, we experimentally develop detection probability curves for OGI-based methane leak detection under different environmental and imaging conditions. Controlled single blind leak detection tests show that the median detection limit (50% detection likelihood) for FLIR-camera based OGI technology is about 20 g CH4/h at an imaging distance of 6 m, an order of magnitude higher than previously reported estimates of 1...
January 19, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29351267/motorcycle-that-see-multifocal-stereo-vision-sensor-for-advanced-safety-systems-in-tilting-vehicles
#6
Gustavo Gil, Giovanni Savino, Simone Piantini, Marco Pierini
Advanced driver assistance systems, ADAS, have shown the possibility to anticipate crash accidents and effectively assist road users in critical traffic situations. This is not the case for motorcyclists, in fact ADAS for motorcycles are still barely developed. Our aim was to study a camera-based sensor for the application of preventive safety in tilting vehicles. We identified two road conflict situations for which automotive remote sensors installed in a tilting vehicle are likely to fail in the identification of critical obstacles...
January 19, 2018: Sensors
https://www.readbyqxmd.com/read/29351025/3d-assessment-of-nasolabial-appearance-in-patients-with-complete-unilateral-cleft-lip-and-palate
#7
Ieva Bagante, Inta Zepa, Ilze Akota
OBJECTIVE: Rhinoplasty in patients with complete unilateral cleft lip and palate (UCLP) is challenging, and the surgical outcome of the nose is complicated to evaluate. The aim of this study was to assess the nasolabial appearance of patients with UCLP compared with a control group. DESIGN: Cross-sectional study. SETTING: Riga Cleft Lip and Palate Centre, Latvia. PARTICIPANTS: All consecutive 35 patients born between 1994 and 2004 with nonsyndromic complete UCLP were included...
February 2018: Cleft Palate-craniofacial Journal
https://www.readbyqxmd.com/read/29350196/estimation-and-correction-of-produced-light-from-prompt-gamma-photons-on-luminescence-imaging-of-water-for-proton-therapy-dosimetry
#8
Takuya Yabe, Masataka Komori, Toshiyuki Toshito, Mitsutaka Yamaguchi, Naoki Kawachi, Seiichi Yamamoto
Although the luminescence images of water during proton-beam irradiation using a cooled charge-coupled device (CCD) camera showed almost the same ranges of proton beams as those measured by an ionization chamber, the depth profiles showed lower Bragg peak intensities than those measured by an ionization chamber. In addition, a broad optical baseline signal was observed in depths that exceed the depth of Bragg peak. We hypothesize that this broad baseline signal originates from interaction of proton-induced prompt gamma photons with water...
January 19, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29349543/saving-robots-improves-laparoscopic-performance-transfer-of-skills-from-a-serious-game-to-a-virtual-reality-simulator
#9
Wouter M IJgosse, Harry van Goor, Jan-Maarten Luursema
BACKGROUND: Residents find it hard to commit to structural laparoscopic skills training. Serious gaming has been proposed as a solution on the premise that it is effective and more motivating than traditional simulation. We establish construct validity for the laparoscopic serious game Underground by comparing laparoscopic simulator performance for a control group and an Underground training group. METHODS: A four-session laparoscopic basic skills course is part of the medical master students surgical internship at the Radboud University Medical Centre...
January 18, 2018: Surgical Endoscopy
https://www.readbyqxmd.com/read/29349425/assessment-of-lower-extremity-ischemia-using-smartphone-thermographic-imaging
#10
Peter H Lin, Marius Saines
Conventional diagnostic modalities for assessing arterial circulation or tissue perfusion include blood pressure measurement, ultrasound evaluation, and contrast-based angiographic assessment. An infrared thermal camera can detect infrared radiation energy from the human body, which generates a thermographic image to allow tissue perfusion analysis. We describe a smartphone-based miniature thermal imaging system that can be used as an adjunctive imaging modality to assess tissue perfusion. This smartphone-based camera device is noninvasive, simple to use, and cost-effective in assessing patients with lower extremity tissue perfusion...
December 2017: Journal of Vascular Surgery Cases and Innovative Techniques
https://www.readbyqxmd.com/read/29349358/95gtc-and-96gtc-as-alternatives-to-medical-radioisotope-99mtc
#11
Takehito Hayakawa, Yuichi Hatsukawa, Toru Tanimori
We studied 95gTc and 96gTc as alternatives to the medical radioisotope 99mTc. 96gTc (95gTc) can be produced by (p, n) reactions on an enriched 96Mo (95Mo) target with a proton beam provided by a compact accelerator such as a medical cyclotron that generate radioisotopes for positron emission tomography (PET). The γ-rays are measured with an electron-tracking Compton camera (ETCC). We calculated the relative intensities of the γ-rays from 95gTc and 96gTc. The calculated γ-ray intensity of a 96gTc (95gTc) nucleus is as high as 63% (70%) of that of a 99mTc nucleus...
January 2018: Heliyon
https://www.readbyqxmd.com/read/29348514/3d-imaging-through-scatterers-with-interferenceless-optical-system
#12
Saswata Mukherjee, A Vijayakumar, Manoj Kumar, Joseph Rosen
Imaging through a scattering medium is a challenging task. We propose and demonstrate an interferenceless incoherent opto-digital technique for 3D imaging through a scatterer with a single lens and a digital camera. The light diffracted from a point object is modulated by a scattering mask. The modulated wavefront is projected on an image sensor using a spherical lens and the impulse response is recorded. An object is placed at the same axial location as the point object and another intensity pattern is recorded with identical experimental conditions and with the same scattering mask...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29347630/temperature-measurement-of-hohlraum-radiation-for-energy-loss-experiments-in-indirectly-laser-heated-carbon-plasma
#13
D Schumacher, S Bedacht, A Blažević, S Busold, W Cayzac, A Frank, T Heßling, D Kraus, A Ortner, G Schaumann, M Roth
For ion energy loss measurements in plasmas with near solid densities, an indirect laser heating scheme for carbon foils has been developed at GSI Helmholtzzentrum für Schwerionenforschung GmbH (Darmstadt, Germany). To achieve an electron density of 10^{22}cm^{3} and an electron temperature of 10-30eV, two carbon foils with an areal density of 100μg/cm^{2} heated in a double-hohlraum configuration have been chosen. In this paper we present the results of temperature measurements of both primary and secondary hohlraums for two different hohlraum designs...
October 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347307/dynamics-of-nonspherical-microbubble-oscillations-above-instability-threshold
#14
Matthieu Guédra, Sarah Cleve, Cyril Mauger, Philippe Blanc-Benon, Claude Inserra
Time-resolved dynamics of nonspherical oscillations of micrometer-sized bubbles are captured and analyzed using high-speed imaging. The axisymmetry of the bubble shape is ensured with certainty for the first time from the recordings of two synchronous high-speed cameras located at 90^{∘}. The temporal dynamics of finite-amplitude nonspherical oscillations are then analyzed for various acoustic pressures above the instability threshold. The experimental results are compared with recent theories accounting for nonlinearities and mode coupling, highlighting particular effects inherent to these mechanisms (saturation of the instability, triggering of nonparametric shape modes)...
December 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347151/near-field-deformation-of-a-liquid-interface-by-atomic-force-microscopy
#15
C Mortagne, V Chireux, R Ledesma-Alonso, M Ogier, F Risso, T Ondarçuhu, D Legendre, Ph Tordjeman
We experiment the interaction between a liquid puddle and a spherical probe by Atomic Force Microscopy (AFM) for a probe radius R ranging from 10 nm to 30 μm. We have developed a new experimental setup by coupling an AFM with a high-speed camera and an inverted optical microscope. Interaction force-distance curves (in contact mode) and frequency shift-distance curves (in frequency modulation mode) are measured for different bulk model liquids for which the probe-liquid Hamaker constant H_{pl} is known. The experimental results, analyzed in the frame of the theoretical model developed in Phys...
July 2017: Physical Review. E
https://www.readbyqxmd.com/read/29346101/stacked-denoising-tensor-auto-encoder-for-action-recognition-with-spatiotemporal-corruptions
#16
Chengcheng Jia, Ming Shao, Sheng Li, Handong Zhao, Yun Fu
Spatially or temporally corrupted action videos are impractical for recognition via vision or learning models. It usually happens when streaming data are captured from unintended moving cameras, which bring occlusion or camera vibration and accordingly result in arbitrary loss of spatiotemporal information. In reality, it is intractable to deal with both spatial and temporal corruptions at the same time. In this paper, we propose a coupled stacked denoising tensor auto-encoder (CSDTAE) model, which approaches this corruption problem in a divide-and-conquer fashion by jointing both the spatial and temporal schemes together...
April 2018: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/29346091/plenoptic-image-motion-deblurring
#17
Paramanand Chandramouli, Meiguang Jin, Daniele Perrone, Paolo Favaro
We propose a method to remove motion blur in a single light field captured with a moving plenoptic camera. Since motion is unknown, we resort to a blind deconvolution formulation, where one aims to identify both the blur point spread function and the latent sharp image. Even in the absence of motion, light field images captured by a plenoptic camera are affected by a non-trivial combination of both aliasing and defocus, which depends on the 3D geometry of the scene. Therefore, motion deblurring algorithms designed for standard cameras are not directly applicable...
April 2018: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/29345327/basics-of-digital-microscopy
#18
Callen T Wallace, Morgan Jessup, Tytus Bernas, Karina A Peña, Michael J Calderon, Patricia A Loughran
Modern digital microscopy combines the equipment of classical light microscopy with a computerized imaging system. The technique comprises image formation by optics, image registration by a camera, and saving of image data in a computer file. This chapter describes limitations that are particular to each of these processes, including optical resolution, efficiency of image registration, characteristics of image file formats, and data management. Further suggestions are given which serve, in turn, to help construct a set of guidelines aimed at optimization of digital microscopic imaging...
January 18, 2018: Current Protocols in Cytometry
https://www.readbyqxmd.com/read/29344933/unexpected-terrestrial-hand-posture-diversity-in-wild-mountain-gorillas
#19
Nathan E Thompson, Kelly R Ostrofsky, Shannon C McFarlin, Martha M Robbins, Tara S Stoinski, Sergio Almécija
OBJECTIVES: Gorillas, along with chimpanzees and bonobos, are ubiquitously described as 'knuckle-walkers.' Consequently, knuckle-walking (KW) has been featured pre-eminently in hypotheses of the pre-bipedal locomotor behavior of hominins and in the evolution of locomotor behavior in apes. However, anecdotal and behavioral accounts suggest that mountain gorillas may utilize a more complex repertoire of hand postures, which could alter current interpretations of African ape locomotion and its role in the emergence of human bipedalism...
January 18, 2018: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/29344924/reliability-of-the-123i-mibg-heart-mediastinum-ratio-results-of-a-multicenter-test-retest-reproducibility-study
#20
Timothy M Bateman, Karthikeyan Ananthasubramaniam, Daniel S Berman, Myron Gerson, Robert Gropler, Milena Henzlova, Fernando Mendoza, Michael Miyamoto, Mahesh Shah, Frederick Weiland
A quantitative measurement, the Heart-to-Mediastinum (H/M) ratio of counts derived from a planar acquisition approximately 4 hours after injection of 123I-mIBG, is a strong predictor of outcomes in patients with stable class II-III heart failure and LVEF ≤ 35%. This study assessed the test-retest reproducibility of the H/M ratio in such patients. 47 subjects with class II-III systolic heart failure and LVEF ≤ 35% were tested at two time intervals separated by 5 to 14 days. Subjects were imaged twice on the same camera using the same radionuclide dose...
January 17, 2018: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
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