Read by QxMD icon Read

Computer vision

Higinio Mora, Jerónimo M Mora-Pascual, Alberto García-García, Pablo Martínez-González
The Iterative Closest Point (ICP) algorithm is currently one of the most popular methods for rigid registration so that it has become the standard in the Robotics and Computer Vision communities. Many applications take advantage of it to align 2D/3D surfaces due to its popularity and simplicity. Nevertheless, some of its phases present a high computational cost thus rendering impossible some of its applications. In this work, it is proposed an efficient approach for the matching phase of the Iterative Closest Point algorithm...
2016: PloS One
Radu Danescu, Razvan Itu, Andra Petrovai
The driving environment is complex and dynamic, and the attention of the driver is continuously challenged, therefore computer based assistance achieved by processing image and sensor data may increase traffic safety. While active sensors and stereovision have the advantage of obtaining 3D data directly, monocular vision is easy to set up, and can benefit from the increasing computational power of smart mobile devices, and from the fact that almost all of them come with an embedded camera. Several driving assistance application are available for mobile devices, but they are mostly targeted for simple scenarios and a limited range of obstacle shapes and poses...
October 17, 2016: Sensors
Cindy X Guo, Raiju J Babu, Joanna M Black, William R Bobier, Carly S Y Lam, Shuan Dai, Tina Y Gao, Robert F Hess, Michelle Jenkins, Yannan Jiang, Lionel Kowal, Varsha Parag, Jayshree South, Sandra Elfride Staffieri, Natalie Walker, Angela Wadham, Benjamin Thompson
BACKGROUND: Amblyopia is a common neurodevelopmental disorder of vision that is characterised by visual impairment in one eye and compromised binocular visual function. Existing evidence-based treatments for children include patching the nonamblyopic eye to encourage use of the amblyopic eye. Currently there are no widely accepted treatments available for adults with amblyopia. The aim of this trial is to assess the efficacy of a new binocular, videogame-based treatment for amblyopia in older children and adults...
October 18, 2016: Trials
Hiroki Sugita, Hideyuki Kuroki, Takahiko Akiyama, Nobuya Daitoku, Rumi Tashima, Hiroshi Tanaka, Shinobu Honda, Masahiko Hirota
INTRODUCTION: In a distal pancreatectomy combined with a distal gastrectomy, the splenic artery and vein must be conserved. However, it is not easy in pure laparoscopic surgery. We performed a hand-assisted laparoscopic spleen-preserving distal pancreatectomy (HALS-SPDP) combined with a laparoscopic distal gastrectomy (LDG) for the treatment of a pancreatic neuroendocrine tumor (NET) with early gastric cancer. PRESENTATION OF CASE: A 67-year-old male was hospitalized with no complaint...
October 8, 2016: International Journal of Surgery Case Reports
Youngsun Kim, Dong-Hwan Hwang
In order to improve the performance of an inertial navigation system, many aiding sensors can be used. Among these aiding sensors, a vision sensor is of particular note due to its benefits in terms of weight, cost, and power consumption. This paper proposes an inertial and vision integrated navigation method for poor vision navigation environments. The proposed method uses focal plane measurements of landmarks in order to provide position, velocity and attitude outputs even when the number of landmarks on the focal plane is not enough for navigation...
October 12, 2016: Sensors
Zhen Zeng, Tijiang Zhang, Yihua Zhou, Xiaoxi Chen
Meningiomas are the most common primary nonneuroglial extra-axial neoplasms, which commonly present as spherical or oval masses with a dural attachment. Meningiomas without dural attachment are rare and, according to their locations, are classified into 5 varieties, including intraventricular, deep Sylvain fissure, pineal region, intraparenchymal, or subcortical meningiomas. To the best of our knowledge, intraparenchymal meningioma with cerebriform pattern has never been reported. In this paper, we report a 34-year-old Chinese male patient who presented with paroxysmal headaches and progressive loss of vision for 10 months and blindness for 2 weeks...
2016: Case Reports in Radiology
Md Habibur Rahman, Md Abdul Qader, Syed Saimul Haque, Md Abdullah Al Mamun, Golam Muin Uddin
Posterior reversible encephalopathy syndrome (PRES) is a rare clinical and radiological phenomenon is encountered in children compared to adults. In our center, a 5-yearold boy with steroid-dependent nephrotic syndrome (SDNS) presented with headache and blurring of vision during relapse after a long course of immunosuppressive therapy. Evaluation by computed tomography scan of the brain showed that the child had hypodense areas throughout the occipital region of the brain. All signs of PRES, except papilledema, resolved after seven days of supportive treatment evidenced by subsequent radiological evaluation...
September 2016: Saudi Journal of Kidney Diseases and Transplantation
Feyi Kunle-Hassan, Minaxi Dattani, Martin Snead, Mala Subash
PURPOSE: To report a case of bilateral intraocular hemorrhage secondary to cerebral venous sinus thrombosis with no associated intracranial hemorrhage. METHODS: Case report. RESULTS: A 32-year-old Asian gentleman presented with left reduced vision as a result of a left subhyaloid macular hemorrhage associated with severe headache. Right retinal hemorrhages were also present. Magnetic resonance imaging and computed tomography brain imaging demonstrated cerebral transverse venous sinus thrombosis...
October 5, 2016: Retinal Cases & Brief Reports
Marc A Bouffard, Wayne T Cornblath, Joseph F Rizzo, Michael S Lee, Lindsey B DeLott, Eric R Eggenberger, Nurhan Torun
BACKGROUND: Transient monocular vision loss (TMVL) is an alarming symptom owing to potentially serious etiologies such as thromboembolism or giant cell arteritis. Our objective is to describe the phenomenon of TMVL present on awakening, which may represent a distinct and benign entity. METHODS: We performed a retrospective observational case series of 29 patients who experienced TMVL on awakening. Patients who described monocular dimming or blackout of vision were included, and those with blurred vision, concurrent eye pain, and binocular vision loss were excluded...
September 29, 2016: Journal of Neuro-ophthalmology: the Official Journal of the North American Neuro-Ophthalmology Society
Navid Elmi Sadr, Bijan Samavat, Payam Mehrian, Alireza Hedayatfar
Introduction. Terson syndrome is described as intraocular hemorrhage in association with any type of intracranial hemorrhage and is associated with higher mortality rate and vision loss. Intraocular hemorrhage in Terson syndrome may be diagnosed using computed tomography but there are false positive results. Silicone oil which is widely used for internal tamponade of complicated retinal detachments has high attenuation on computed tomography and hyperintensity on T1-weighted magnetic resonance imaging that can mimic intraocular hemorrhage...
2016: Case Reports in Ophthalmological Medicine
Kevin Patrick, Eric B Hekler, Deborah Estrin, David C Mohr, Heleen Riper, David Crane, Job Godino, William T Riley
This paper addresses the rapid pace of change in the technologies that support digital interventions; the complexity of the health problems they aim to address; and the adaptation of scientific methods to accommodate the volume, velocity, and variety of data and interventions possible from these technologies. Information, communication, and computing technologies are now part of every societal domain and support essentially every facet of human activity. Ubiquitous computing, a vision articulated fewer than 30 years ago, has now arrived...
November 2016: American Journal of Preventive Medicine
David Bouget, Max Allan, Danail Stoyanov, Pierre Jannin
In recent years, tremendous progress has been made in surgical practice for example with Minimally Invasive Surgery (MIS). To overcome challenges coming from deported eye-to-hand manipulation, robotic and computer-assisted systems have been developed. Having real-time knowledge of the pose of surgical tools with respect to the surgical camera and underlying anatomy is a key ingredient for such systems. In this paper, we present a review of the literature dealing with vision-based and marker-less surgical tool detection...
September 13, 2016: Medical Image Analysis
Jiangbo Lu, Yu Li, Hongsheng Yang, Dongbo Min, Weiyong Eng, Minh Do
Though many tasks in computer vision can be formulated elegantly as pixel-labeling problems, a typical challenge discouraging such a discrete formulation is often due to computational efficiency. Recent studies on fast cost volume filtering based on efficient edge-aware filters provide a fast alternative to solve discrete labeling problems, with the complexity independent of the support window size. However, these methods still have to step through the entire cost volume exhaustively, which makes the solution speed scale linearly with the label space size...
October 11, 2016: IEEE Transactions on Pattern Analysis and Machine Intelligence
Rolfe M Radcliffe, Yasmine Messiaen, Nita L Irby, Thomas J Divers, Curtis W Dewey, Katharyn J Mitchell, Lauren V Schnabel, Abraham J Bezuidenhout, Peter V Scrivani, Norm G Ducharme
OBJECTIVE: To report a transnasal, endoscopically guided ventral surgical approach for accessing the cranial and caudal segments of the sphenopalatine sinus for mass removal in a horse. STUDY DESIGN: Case report. ANIMAL: Adult horse with acute onset blindness referable to a soft tissue mass within the sphenopalatine sinus. CLINICAL REPORT: A 7-year-old Warmblood gelding presented with a history of running into a fence and falling...
October 12, 2016: Veterinary Surgery: VS
Alvin Rajkomar, Sneha Lingam, Andrew G Taylor, Michael Blum, John Mongan
The study aimed to determine if computer vision techniques rooted in deep learning can use a small set of radiographs to perform clinically relevant image classification with high fidelity. One thousand eight hundred eighty-five chest radiographs on 909 patients obtained between January 2013 and July 2015 at our institution were retrieved and anonymized. The source images were manually annotated as frontal or lateral and randomly divided into training, validation, and test sets. Training and validation sets were augmented to over 150,000 images using standard image manipulations...
October 11, 2016: Journal of Digital Imaging: the Official Journal of the Society for Computer Applications in Radiology
Yi C Zhang, Alexander C Kagen
TensorFlow is a second-generation open-source machine learning software library with a built-in framework for implementing neural networks in wide variety of perceptual tasks. Although TensorFlow usage is well established with computer vision datasets, the TensorFlow interface with DICOM formats for medical imaging remains to be established. Our goal is to extend the TensorFlow API to accept raw DICOM images as input; 1513 DaTscan DICOM images were obtained from the Parkinson's Progression Markers Initiative (PPMI) database...
October 11, 2016: Journal of Digital Imaging: the Official Journal of the Society for Computer Applications in Radiology
Dongdong Bai, Chaoqun Wang, Bo Zhang, Xiaodong Yi, Yuhua Tang
The loop closure detection (LCD) is an essential part of visual simultaneous localization and mapping systems (SLAM). LCD is capable of identifying and compensating the accumulation drift of localization algorithms to produce an consistent map if the loops are checked correctly. Deep convolutional neural networks (CNNs) have outperformed state-of-the-art solutions that use traditional hand-crafted features in many computer vision and pattern recognition applications. After the great success of CNNs, there has been much interest in applying CNNs features to robotic fields such as visual LCD...
2016: Robotics and Biomimetics
Peter B M Thomas, Tadas Baltrušaitis, Peter Robinson, Anthony J Vivian
PURPOSE: We validate a video-based method of head posture measurement. METHODS: The Cambridge Face Tracker uses neural networks (constrained local neural fields) to recognize facial features in video. The relative position of these facial features is used to calculate head posture. First, we assess the accuracy of this approach against videos in three research databases where each frame is tagged with a precisely measured head posture. Second, we compare our method to a commercially available mechanical device, the Cervical Range of Motion device: four subjects each adopted 43 distinct head postures that were measured using both methods...
September 2016: Translational Vision Science & Technology
Dierck Hillmann, Hendrik Spahr, Clara Pfäffle, Helge Sudkamp, Gesa Franke, Gereon Hüttmann
Noninvasive functional imaging of molecular and cellular processes of vision may have immense impact on research and clinical diagnostics. Although suitable intrinsic optical signals (IOSs) have been observed ex vivo and in immobilized animals in vivo, detecting IOSs of photoreceptor activity in living humans was cumbersome and time consuming. Here, we observed clear spatially and temporally resolved changes in the optical path length of the photoreceptor outer segment as a response to an optical stimulus in the living human eye...
October 11, 2016: Proceedings of the National Academy of Sciences of the United States of America
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"