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Feature Tracking

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https://www.readbyqxmd.com/read/28820891/scene-text-detection-via-extremal-region-based-double-threshold-convolutional-network-classification
#1
Wei Zhu, Jing Lou, Longtao Chen, Qingyuan Xia, Mingwu Ren
In this paper, we present a robust text detection approach in natural images which is based on region proposal mechanism. A powerful low-level detector named saliency enhanced-MSER extended from the widely-used MSER is proposed by incorporating saliency detection methods, which ensures a high recall rate. Given a natural image, character candidates are extracted from three channels in a perception-based illumination invariant color space by saliency-enhanced MSER algorithm. A discriminative convolutional neural network (CNN) is jointly trained with multi-level information including pixel-level and character-level information as character candidate classifier...
2017: PloS One
https://www.readbyqxmd.com/read/28820176/5-hydroxymethylcytosine-signatures-in-cell-free-dna-provide-information-about-tumor-types-and-stages
#2
Chun-Xiao Song, Senlin Yin, Li Ma, Amanda Wheeler, Yu Chen, Yan Zhang, Bin Liu, Junjie Xiong, Weihan Zhang, Jiankun Hu, Zongguang Zhou, Biao Dong, Zhiqi Tian, Stefanie S Jeffrey, Mei-Sze Chua, Samuel So, Weimin Li, Yuquan Wei, Jiajie Diao, Dan Xie, Stephen R Quake
5-Hydroxymethylcytosine (5hmC) is an important mammalian DNA epigenetic modification that has been linked to gene regulation and cancer pathogenesis. Here we explored the diagnostic potential of 5hmC in circulating cell-free DNA (cfDNA) using a sensitive chemical labeling-based low-input shotgun sequencing approach. We sequenced cell-free 5hmC from 49 patients of seven different cancer types and found distinct features that could be used to predict cancer types and stages with high accuracy. Specifically, we discovered that lung cancer leads to a progressive global loss of 5hmC in cfDNA, whereas hepatocellular carcinoma and pancreatic cancer lead to disease-specific changes in the cell-free hydroxymethylome...
August 18, 2017: Cell Research
https://www.readbyqxmd.com/read/28817694/a-new-holistic-3d-non-invasive-analysis-of-cellular-distribution-and-motility-on-fibroin-alginate-microcarriers-using-light-sheet-fluorescent-microscopy
#3
Serena Duchi, Filippo Piccinini, Michela Pierini, Alessandro Bevilacqua, Maria Luisa Torre, Enrico Lucarelli, Spartaco Santi
Cell interaction with biomaterials is one of the keystones to developing medical devices for tissue engineering applications. Biomaterials are the scaffolds that give three-dimensional support to the cells, and are vectors that deliver the cells to the injured tissue requiring repair. Features of biomaterials can influence the behaviour of the cells and consequently the efficacy of the tissue-engineered product. The adhesion, distribution and motility of the seeded cells onto the scaffold represent key aspects, and must be evaluated in vitro during the product development, especially when the efficacy of a specific tissue-engineered product depends on viable and functional cell loading...
2017: PloS One
https://www.readbyqxmd.com/read/28817430/beyond-citation-rates-a-real-time-impact-analysis-of-health-professions-education-research-using-altmetrics
#4
Lauren A Maggio, Holly S Meyer, Anthony R Artino
PURPOSE: To complement traditional citation-based metrics, which take years to accrue and indicate only academic attention, academia has begun considering altmetrics or alternative metrics, which provide timely feedback on an article's impact by tracking its dissemination via nontraditional outlets, such as blogs and social media, across audiences. This article describes altmetrics and examines altmetrics attention, outlets used, and top article characteristics for health professions education (HPE) research...
August 16, 2017: Academic Medicine: Journal of the Association of American Medical Colleges
https://www.readbyqxmd.com/read/28816662/distortion-aware-correlation-tracking
#5
Hanhui Li, Hefeng Wu, Huifang Zhang, Shujin Lin, Xiaonan Luo, Ruomei Wang
Recently, correlation filter (CF) based tracking methods have attracted considerable attention because of their high-speed performance. However, distortion, which refers to the phenomenon that the correlation outputs of CF based trackers are distorted, remains a major obstacle for these methods. In this paper, we propose a Distortion-Aware Correlation Filter (DACF) framework, which can detect distortions and recover from tracking failures. Our framework employs a simple yet effective feature termed normed correlation response to detect distortions...
August 14, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28816656/tracking-by-detection-of-3d-human-shapes-from-surfaces-to-volumes
#6
Chun-Hao Huang, Benjamin Allain, Edmond Boyer, Jean-Sebastien Franco, Federico Tombari, Nassir Navab, Slobodan Ilic
3D Human shape tracking consists in fitting a template model to temporal sequences of visual observations. It usually comprises an association step, that finds correspondences between the model and the input data, and a deformation step, that fits the model to the observations given correspondences. Most current approaches follow the Iterative-Closest-Point (ICP) paradigm, where the association step is carried out by searching for the nearest neighbors. It fails when large deformations occur and errors in the association tend to propagate over time...
August 15, 2017: IEEE Transactions on Pattern Analysis and Machine Intelligence
https://www.readbyqxmd.com/read/28814054/crux-a-compliant-robotic-upper-extremity-exosuit-for-lightweight-portable-multi-joint-muscular-augmentation
#7
Steven Lessard, Pattawong Pansodtee, Ash Robbins, Leya Breanna Baltaxe-Admony, James M Trombadore, Mircea Teodorescu, Adrian Agogino, Sri Kurniawan
Wearable robots can potentially offer their users enhanced stability and strength. These augmentations are ideally designed to actuate harmoniously with the user's movements and provide extra force as needed. The creation of such robots, however, is particularly challenging due to the underlying complexity of the human body. In this paper, we present a compliant, robotic exosuit for upper extremities called CRUX. This exosuit, inspired by tensegrity models of the human arm, features a lightweight (1.3 kg), flexible multi-joint design for portable augmentation...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813925/stereo-3d-tracking-of-infants-in-natural-play-conditions
#8
Shreyas S Shivakumar, Helen Loeb, Daniel K Bogen, Frances Shofer, Phillip Bryant, Laura Prosser, Michelle J Johnson
This paper describes the design and implementation of a multiple view stereoscopic 3D vision system and a supporting infant tracker pipeline to track limb movement in natural play environments and identify potential metrics to quantify movement behavior. So far, human pose estimation and tracking with 3D cameras has been focused primarily on adults and cannot be directly extended to infants because of differences in visual features such as shapes, sizes and appearance. With rehabilitation in mind, we propose a portable, compact, markerless, low cost and high resolution 3D vision system and a tracking algorithm that exploits infant appearance attributes and depth information...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813641/aim2-inflammasome-activation-and-regulation-a-structural-perspective
#9
Bing Wang, Qian Yin
Absent in melanoma 2 (AIM2) inflammasome is a multi-protein platform that recognizes aberrant cytoplasmic dsDNA and induces cytokine maturation, release and pyroptosis. It is composed of AIM2, apoptosis-associated speck-like protein containing a CARD (ASC), and caspase-1. Recent X-ray crystallographic and high resolution cryo-electron microscopic (cryo-EM) studies have revealed a series of structures in AIM2 inflammasome activation and regulation. One prominent feature common in multiple steps is the assembly of high-order structures, especially helical filaments nucleated by upstream molecules, rather than stoichiometric complexes...
August 13, 2017: Journal of Structural Biology
https://www.readbyqxmd.com/read/28813578/incomitance-and-eye-dominance-in-intermittent-exotropia
#10
Daniel L Adams, John R Economides, Jonathan C Horton
Purpose: To determine if the deviation angle changes in subjects with intermittent exotropia as they alternate fixation between the right and left eye in primary gaze. Methods: In this prospective observational cohort study, 37 subjects with intermittent exotropia were tested for evidence of incomitance. The position of each eye was recorded with a video tracker during fixation on a small central target. A cover-uncover test was performed by occluding one eye with a shutter that passed infrared light, allowing continuous tracking of both eyes...
August 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28813234/cardiac-mr-strain-a-noninvasive-biomarker-of-fibrofatty-remodeling-of-the-left-atrial-myocardium
#11
Adrian T Huber, Jérôme Lamy, Amer Rahhal, Morgane Evin, Fabrice Atassi, Carine Defrance, Guillaume Lebreton, Karine Clément, Myriam Berthet, Richard Isnard, Pascal Leprince, Philippe Cluzel, Stéphane N Hatem, Nadjia Kachenoura, Alban Redheuil
Purpose To determine whether left atrial (LA) strain quantification with cardiac magnetic resonance (MR) imaging feature tracking is associated with the severity of LA fibrofatty myocardial remodeling at histologic analysis. Materials and Methods This prospective case-control study was approved by the institutional review board. LA strain was evaluated with cardiac MR feature tracking between January 2014 and March 2015 in 13 consecutive patients (mean age, 61 years ± 19; nine male) with mitral regurgitation in the 24 hours before mitral valve surgery and 13 age- and sex-matched healthy control subjects...
August 16, 2017: Radiology
https://www.readbyqxmd.com/read/28812061/behavioral-comorbidities-and-drug-treatments-in-a-zebrafish-scn1lab-model-of-dravet-syndrome
#12
Brian P Grone, Tiange Qu, Scott C Baraban
Loss-of-function mutations in SCN1A cause Dravet syndrome (DS), a catastrophic childhood epilepsy in which patients experience comorbid behavioral conditions, including movement disorders, sleep abnormalities, anxiety, and intellectual disability. To study the functional consequences of voltage-gated sodium channel mutations, we use zebrafish with a loss-of-function mutation in scn1lab, a zebrafish homolog of human SCN1A. Homozygous scn1lab(s552/s552) mutants exhibit early-life seizures, metabolic deficits, and early death...
July 2017: ENeuro
https://www.readbyqxmd.com/read/28811461/sparse-orthogonal-population-representation-of-spatial-context-in-the-retrosplenial-cortex
#13
Dun Mao, Steffen Kandler, Bruce L McNaughton, Vincent Bonin
Sparse orthogonal coding is a key feature of hippocampal neural activity, which is believed to increase episodic memory capacity and to assist in navigation. Some retrosplenial cortex (RSC) neurons convey distributed spatial and navigational signals, but place-field representations such as observed in the hippocampus have not been reported. Combining cellular Ca(2+) imaging in RSC of mice with a head-fixed locomotion assay, we identified a population of RSC neurons, located predominantly in superficial layers, whose ensemble activity closely resembles that of hippocampal CA1 place cells during the same task...
August 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28810408/emotional-responses-to-disfigured-faces-and-disgust-sensitivity-an-eye-tracking-study
#14
Anna Stone, Anita Potton
Facial disfigurement attracts attention and evokes negative emotion, but evidence is lacking for a link between these two reactions. The present experiment ( n = 29) investigated emotional and attentional reactions to photographs of people with disfigured faces. An eye-tracker was used to measure fixation on internal expressive features and on the forehead. Disfigurement to the internal expressive features invoked a stronger emotional reaction than disfigurement to the forehead. Attention in the area of disfigurement was associated with negative emotion (embarrassment, sympathy, disgust, repulsion) as well as surprise...
January 1, 2017: Journal of Health Psychology
https://www.readbyqxmd.com/read/28809715/prescribed-performance-control-of-uncertain-euler-lagrange-systems-subject-to-full-state-constraints
#15
Kai Zhao, Yongduan Song, Tiedong Ma, Liu He
This paper studies the zero-error tracking control problem of Euler-Lagrange systems subject to full-state constraints and nonparametric uncertainties. By blending an error transformation with barrier Lyapunov function, a neural adaptive tracking control scheme is developed, resulting in a solution with several salient features: 1) the control action is continuous and C¹ smooth; 2) the full-state tracking error converges to a prescribed compact set around origin within a given finite time at a controllable rate of convergence that can be uniformly prespecified; 3) with Nussbaum gain in the loop, the tracking error further shrinks to zero as t→∞; and 4) the neural network (NN) unit can be safely included in the loop during the entire system operational envelope without the danger of violating the compact set precondition imposed on the NN training inputs...
August 11, 2017: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/28809698/deep-6-dof-tracking
#16
Mathieu Garon, Jean-Francois Lalonde
We present a temporal 6-DOF tracking method which leverages deep learning to achieve state-of-the-art performance on challenging datasets of real world capture. Our method is both more accurate and more robust to occlusions than the existing best performing approaches while maintaining real-time performance. To assess its efficacy, we evaluate our approach on several challenging RGBD sequences of real objects in a variety of conditions. Notably, we systematically evaluate robustness to occlusions through a series of sequences where the object to be tracked is increasingly occluded...
August 10, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28809094/an-automated-skills-assessment-framework-for-laparoscopic-training-tasks
#17
Nicholas P Sgouros, Constantinos Loukas, Vassiliki Koufi, Theodore G Troupis, Evangelos Georgiou
BACKGROUND: Various sensors and methods are used for evaluating trainees' skills in laparoscopic procedures. These methods are usually task-specific and involve high costs or advanced setups. METHODS: In this paper, we propose a novel manoeuver representation feature space (MRFS) constructed by tracking the vanishing points of the edges of the graspers on the video sequence frames, acquired by the standard box trainer camera. This study aims to provide task-agnostic classification of trainees in experts and novices using a single MRFS over two basic laparoscopic tasks...
August 15, 2017: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/28808900/varying-ultrasound-power-level-to-distinguish-surgical-instruments-and-tissue
#18
Hongliang Ren, Banani Anuraj, Pierre E Dupont
We investigate a new framework of surgical instrument detection based on power-varying ultrasound images with simple and efficient pixel-wise intensity processing. Without using complicated feature extraction methods, we identified the instrument with an estimated optimal power level and by comparing pixel values of varying transducer power level images. The proposed framework exploits the physics of ultrasound imaging system by varying the transducer power level to effectively distinguish metallic surgical instruments from tissue...
August 15, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28808772/longitudinal-strain-assessed-by-cardiac-magnetic-resonance-correlates-to-hemodynamic-findings-in-patients-with-severe-aortic-stenosis-and-predicts-positive-remodeling-after-transcatheter-aortic-valve-replacement
#19
Dominik Buckert, Maciej Cieslik, Raid Tibi, Michael Radermacher, Volker Rasche, Peter Bernhardt, Vinzenz Hombach, Wolfgang Rottbauer, Jochen Wöhrle
AIMS: To assess left-ventricular strain parameters before and after transcatheter aortic valve replacement (TAVR) by feature tracking cardiac magnetic resonance imaging (FT CMR) and to correlate the findings to hemodynamic state and left-ventricular remodeling. METHODS AND RESULTS: Patients with symptomatic AS underwent FT CMR before and after TAVR. Patients were carefully evaluated by a comprehensive work-up including CMR, echocardiography and left and right heart catheterization...
August 14, 2017: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
https://www.readbyqxmd.com/read/28807362/leg-movement-tracking-in-automatic-video-based-one-leg-stance-evaluation
#20
Jacek Kawa, Paula Stępień, Wojciech Kapko, Aleksandra Niedziela, Jarosław Derejczyk
Falls are a major risk in elder population. Early diagnosis is therefore an important step towards increasing the safety of elders. One of the common diagnostic tests is the Berg Balance Scale (BBS), consisting of 14 exercises arranged from the easiest (sitting-to-standing) to the most demanding (one-leg stance). In this study a novel approach to the automatic assessment of the time in which the patient can remain in the one-leg stance position without loosing balance is introduced. The data is collected using a regular video camera...
August 3, 2017: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
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