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https://www.readbyqxmd.com/read/29140783/blending-face-details-synthesizing-a-face-using-multiscale-face-models
#1
Seung-Hyun Yoon, John Lewis, Taehyun Rhee
Creating realistic 3D face models is a challenging problem in computer graphics because humans are so sensitive to facial abnormalities. The authors propose a method to synthesize a 3D face model using weighted blending of multiscale details from different face models. Using multiscale continuous displacement maps (CDMs), they achieve full correspondences across multiple scales in the parameter space. Their results demonstrate detail transfer across faces with highly different proportions, such as between humans and nonhuman creatures...
November 2017: IEEE Computer Graphics and Applications
https://www.readbyqxmd.com/read/29131188/laser-display-system-for-multi-depth-screen-projection-scenarios
#2
J Pablo La Torre, Nathan Mayes, Nabeel A Riza
Proposed is a laser projection display system that uses an electronically controlled variable focus lens (ECVFL) to achieve sharp and in-focus image projection over multi-distance three-dimensional (3D) conformal screens. The system also functions as an embedded distance sensor that enables 3D mapping of the multi-level screen platform before the desired laser scanned beam focused/defocused projected spot sizes are matched to the different localized screen distances on the 3D screen. Compared to conventional laser scanning and spatial light modulator (SLM) based projection systems, the proposed design offers in-focus non-distorted projection over a multi-distance screen zone with varying depths...
November 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29127653/development-of-a-3d-workspace-shoulder-assessment-tool-incorporating-electromyography-and-an-inertial-measurement-unit-a-preliminary-study
#3
Navid Aslani, Siamak Noroozi, Philip Davenport, Richard Hartley, Mihai Dupac, Philip Sewell
Traditional shoulder range of movement (ROM) measurement tools suffer from inaccuracy or from long experimental setup times. Recently, it has been demonstrated that relatively low-cost wearable inertial measurement unit (IMU) sensors can overcome many of the limitations of traditional motion tracking systems. The aim of this study is to develop and evaluate a single IMU combined with an electromyography (EMG) sensor to monitor the 3D reachable workspace with simultaneous measurement of deltoid muscle activity across the shoulder ROM...
November 11, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29094238/computational-wear-assessment-of-hard-on-hard-hip-implants-subject-to-physically-demanding-tasks
#4
R Nithyaprakash, S Shankar, M S Uddin
Hip implants subject to gait loading due to occupational activities are potentially prone to failures such as osteolysis and aseptic loosening, causing painful revision surgeries. Highly risky gait activities such as carrying a load, stairs up or down and ladder up or down may cause excessive loading at the hip joint, resulting in generation of wear and related debris. Estimation of wear under the above gait activities is thus crucial to design and develop a new and improved implant component. With this motivation, this paper presents an assessment of wear generation of PCD-on-PCD (poly crystalline diamond) hip implants using finite element (FE) analysis...
November 2, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29093757/movement-coordination-patterns-between-the-foot-joints-during-walking
#5
John B Arnold, Paolo Caravaggi, François Fraysse, Dominic Thewlis, Alberto Leardini
Background: In 3D gait analysis, kinematics of the foot joints are usually reported via isolated time histories of joint rotations and no information is provided on the relationship between rotations at different joints. The aim of this study was to identify movement coordination patterns in the foot during walking by expanding an existing vector coding technique according to an established multi-segment foot and ankle model. A graphical representation is also described to summarise the coordination patterns of joint rotations across multiple patients...
2017: Journal of Foot and Ankle Research
https://www.readbyqxmd.com/read/29076105/gaze3dfix-detecting-3d-fixations-with-an-ellipsoidal-bounding-volume
#6
Sascha Weber, Rebekka S Schubert, Stefan Vogt, Boris M Velichkovsky, Sebastian Pannasch
Nowadays, the use of eyetracking to determine 2-D gaze positions is common practice, and several approaches to the detection of 2-D fixations exist, but ready-to-use algorithms to determine eye movements in three dimensions are still missing. Here we present a dispersion-based algorithm with an ellipsoidal bounding volume that estimates 3D fixations. Therefore, 3D gaze points are obtained using a vector-based approach and are further processed with our algorithm. To evaluate the accuracy of our method, we performed experimental studies with real and virtual stimuli...
October 26, 2017: Behavior Research Methods
https://www.readbyqxmd.com/read/29075647/systematic-standardized-and-individualized-assessment-of-masticatory-cycles-using-electromagnetic-3d-articulography-and-computer-scripts
#7
Ramón Fuentes, Alain Arias, María Florencia Lezcano, Diego Saravia, Gisaku Kuramochi, Fernando José Dias
Masticatory movements are studied for decades in odontology; a better understanding of them could improve dental treatments. The aim of this study was to describe an innovative, accurate, and systematic method of analyzing masticatory cycles, generating comparable quantitative data. The masticatory cycles of 5 volunteers (Class I, 19 ± 1.7 years) without articular or dental occlusion problems were evaluated using 3D electromagnetic articulography supported by MATLAB software. The method allows the trajectory morphology of the set of chewing cycles to be analyzed from different views and angles...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29068678/efficient-and-accurate-born-oppenheimer-molecular-dynamics-for-large-molecular-systems
#8
Laurens D M Peters, Jörg Kussmann, Christian Ochsenfeld
An efficient scheme for the calculation of Born-Oppenheimer molecular dynamics (BOMD) simulations is introduced. It combines the corrected small basis set Hartree-Fock (HF-3c) method by Sure and Grimme [J. Comput. Chem. 2013, 43, 1672], extended Lagrangian BOMD (XL-BOMD) by Niklasson et al. [J. Chem. Phys. 2009, 130, 214109], and the calculation of the two electron integrals on graphics processing units (GPUs) [J. Chem. Phys. 2013, 138, 134114; J. Chem. Theory Comput. 2015, 11, 918]. To explore the parallel performance of our strong scaling implementation of the method, we present timings and extract, as its validation and first illustrative application, high-quality vibrational spectra from simulated trajectories of β-carotene, paclitaxel, and liquid water (up to 500 atoms)...
October 25, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/29060763/graph-theoretical-analysis-of-eeg-functional-network-during-multi-workload-flight-simulation-experiment-in-virtual-reality-environment
#9
Shengqian Zhang, Yuan Zhang, Yu Sun, Nitish Thakor, Anastasios Bezerianos
The research field of mental workload has attracted abundant researchers as mental workload plays a crucial role in real-life performance and safety. While previous studies have examined the neural correlates of mental workload in 2D scenarios (i.e., presenting stimuli on a computer screen (CS) environment using univariate methods (e.g., EEG channel power), it is still unclear of the findings of one that uses multivariate approach using graphical theory and the effects of a 3D environment (i.e., presenting stimuli on a Virtual Reality (VR))...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060702/gpu-based-volume-reconstruction-for-freehand-3d-ultrasound-imaging
#10
Tiexiang Wen, Rong Liu, Lei Liu, Wenjian Qin, Ling Li, Jia Gu
Volume reconstruction plays an important role in improving image quality for freehand three-dimensional (3D) ultrasound imaging. The kernel regression provides an effective method for volume reconstruction in 3D ultrasound imaging, but it requires heavily computational time-cost. In this paper, a programmable graphic-processor-unit-(GPU) based fast kernel regression method is proposed for freehand 3D ultrasound volume reconstruction. The most significant aspect of our method is the adopting of powerful data-parallel computing capability of GPU to improve the overall efficiency...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29054263/nmsbuilder-freeware-to-create-subject-specific-musculoskeletal-models-for-opensim
#11
Giordano Valente, Gianluigi Crimi, Nicola Vanella, Enrico Schileo, Fulvia Taddei
BACKGROUND AND OBJECTIVE: Musculoskeletal modeling and simulations of movement have been increasingly used in orthopedic and neurological scenarios, with increased attention to subject-specific applications. In general, musculoskeletal modeling applications have been facilitated by the development of dedicated software tools; however, subject-specific studies have been limited also by time-consuming modeling workflows and high skilled expertise required. In addition, no reference tools exist to standardize the process of musculoskeletal model creation and make it more efficient...
December 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/29044753/development-of-a-quantitative-intracranial-vascular-features-extraction-tool-on-3d-mra-using-semiautomated-open-curve-active-contour-vessel-tracing
#12
Li Chen, Mahmud Mossa-Basha, Niranjan Balu, Gador Canton, Jie Sun, Kristi Pimentel, Thomas S Hatsukami, Jenq-Neng Hwang, Chun Yuan
PURPOSE: To develop a quantitative intracranial artery measurement technique to extract comprehensive artery features from time-of-flight MR angiography (MRA). METHODS: By semiautomatically tracing arteries based on an open-curve active contour model in a graphical user interface, 12 basic morphometric features and 16 basic intensity features for each artery were identified. Arteries were then classified as one of 24 types using prediction from a probability model...
October 17, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29035226/evaluating-approaches-to-rendering-braille-text-on-a-high-density-pin-display
#13
Valerie S Morash, Alexander Russomanno, R Brent Gillespie, Sile OModhrain
Refreshable displays for tactile graphics are typically composed of pins that have smaller diameters and spacing than standard braille dots. We investigated configurations of high-density pins to form braille text on such displays using non-refreshable stimuli produced with a 3D printer. Normal dot braille (diameter 1.5 mm) was compared to high-density dot braille (diameter 0.75 mm) wherein each normal dot was rendered by high-density simulated pins alone or in a cluster of pins configured in a diamond, X, or square; and to "blobs" that could result from covering normal braille and high-density multi-pin configurations with a thin membrane...
October 13, 2017: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/29033190/3d-modelling-of-radical-prostatectomy-specimens-developing-a-method-to-quantify-tumor-morphometry-for-prostate-cancer-risk-prediction
#14
Marcus C Hovens, Kevin Lo, Michael Kerger, John Pedersen, Timothy Nottle, Natalie Kurganovs, Andrew Ryan, Justin S Peters, Daniel Moon, Anthony J Costello, Niall M Corcoran, Matthew K H Hong
Prostate cancer displays a wide spectrum of clinical behaviour from biological indolence to rapidly lethal disease, but we remain unable to accurately predict an individual tumor's future clinical course at an early curable stage. Beyond basic dimensions and volume calculations, tumor morphometry is an area that has received little attention, as it requires the analysis of the prostate gland and tumor foci in three-dimensions. Previous efforts to generate three-dimensional prostate models have required specialised graphics units and focused on the spatial distribution of tumors for optimisation of biopsy strategies rather than to generate novel morphometric variables such as tumor surface area...
September 27, 2017: Pathology, Research and Practice
https://www.readbyqxmd.com/read/29028201/summed-area-technique-for-cube-maps
#15
Yi Xiao, Tze-Yui Ho, Chi-Sing Leung
The original Summed Area Table (SAT) structure is designed for handling 2D rectangular data. Due to the nature of spherical functions, the SAT structure cannot handle cube maps directly. This paper proposes a new SAT structure for cube maps and develops the corresponding lookup algorithm. Our formulation starts by considering a cube map as part of an auxiliary 3D function defined in a 3D rectangular space. We interpret the 2D integration process over the cube map surface as a 3D integration over the auxiliary 3D function...
October 11, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28980447/rjsplot-interactive-graphs-with-r
#16
David Barrios, Carlos Prieto
Data visualization techniques provide new methods for the generation of interactive graphs. These graphs allow a better exploration and interpretation of data but their creation requires advanced knowledge of graphical libraries. Recent packages have enabled the integration of interactive graphs in R. However, R provides limited graphical packages that allow the generation of interactive graphs for computational biology applications. The present project has joined the analytical power of R with the interactive graphical features of JavaScript in a new R package (RJSplot)...
October 5, 2017: Molecular Informatics
https://www.readbyqxmd.com/read/28967402/a-hemispherical-contact-model-for-simplifying-3d-occlusal-surfaces
#17
Miguel Castro-Garcia, Pedro Ángel Moreno-Cabello, Miguel Ángel Rubio-Paramio, Pilar Carranza-Cañadas, Geoffrey A Thompson
STATEMENT OF PROBLEM: Currently, dental articulators can recreate mandibular movements and occlusal contacts. However, whether virtual articulators can also provide information about occluding dental surfaces, functional movements, and the mandibular condyles is unclear. PURPOSE: The purpose of this in vitro study was to evaluate the occluding surfaces on dental casts obtained from a patient and approximate them to a hemispherical contact model. Both models were tested by digitizing the Dentatus ARL dental articulator...
September 27, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28966836/three-dimensional-imaging-and-scanning-current-and-future-applications-for-pathology
#18
Navid Farahani, Alex Braun, Dylan Jutt, Todd Huffman, Nick Reder, Zheng Liu, Yukako Yagi, Liron Pantanowitz
Imaging is vital for the assessment of physiologic and phenotypic details. In the past, biomedical imaging was heavily reliant on analog, low-throughput methods, which would produce two-dimensional images. However, newer, digital, and high-throughput three-dimensional (3D) imaging methods, which rely on computer vision and computer graphics, are transforming the way biomedical professionals practice. 3D imaging has been useful in diagnostic, prognostic, and therapeutic decision-making for the medical and biomedical professions...
2017: Journal of Pathology Informatics
https://www.readbyqxmd.com/read/28965124/a-novel-bioluminescent-nanoluc-yeast-estrogen-screen-biosensor-nanoyes-with-a-compact-wireless-camera-for-effect-based-detection-of-endocrine-disrupting-chemicals
#19
Luca Cevenini, Antonia Lopreside, Maria Maddalena Calabretta, Marcello D'Elia, Patrizia Simoni, Elisa Michelini, Aldo Roda
The presence of chemicals with estrogenic activity in surface, groundwater, and drinking water poses serious concerns for potential threats to human health and aquatic life. At present, no sensitive portable devices are available for the rapid monitoring of such contamination. Here, we propose a cell-based mobile platform that exploits a newly developed bioluminescent yeast-estrogen screen (nanoYES) and a low-cost compact camera as light detector. Saccharomyces cerevisiae cells were genetically engineered with a yeast codon-optimized variant of NanoLuc luciferase (yNLucP) under the regulation of human estrogen receptor α activation...
September 30, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28963961/integrating-geometric-configuration-and-appearance-information-into-a-unified-framework-for-anatomical-landmark-localization
#20
Martin Urschler, Thomas Ebner, Darko Štern
In approaches for automatic localization of multiple anatomical landmarks, disambiguation of locally similar structures as obtained by locally accurate candidate generation is often performed by solely including high level knowledge about geometric landmark configuration. In our novel localization approach, we propose to combine both image appearance information and geometric landmark configuration into a unified random forest framework integrated into an optimization procedure that iteratively refines joint landmark predictions by using the coordinate descent algorithm...
September 21, 2017: Medical Image Analysis
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