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Artificial vision

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https://www.readbyqxmd.com/read/28803481/autonomous-collision-free-navigation-of-microvehicles-in-complex-and-dynamically-changing-environments
#1
Tianlong Li, Xiaocong Chang, Zhiguang Wu, Jinxing Li, Guangbin Shao, Xinghong Deng, Jianbin Qiu, Bin Guo, Guangyu Zhang, Qiang He, Longqiu Li, Joseph Wang
Self-propelled micro- and nanoscale robots represent a rapidly emerging and fascinating robotics research area. However, designing autonomous and adaptive control systems for operating micro-/nanorobotics in complex and dynamically-changing environments, which is a highly demanding feature, is still an unmet challenge. Here we describe a smart microvehicle for precise autonomous navigation in complicated environments and traffic scenarios. The fully autonomous navigation system of the smart microvehicle is composed of a microscope-coupled CCD camera, an artificial intelligence planner, and a magnetic field generator...
August 12, 2017: ACS Nano
https://www.readbyqxmd.com/read/28802684/-management-of-post-traumatic-aphakia-and-aniridia-retrospective-study-of-17-patients-undergoing-scleral-sutured-artificial-iris-intraocular-lens-implantation-management-of-aphakia-aniridia-with-scleral-sutured-artificial-iris-intraocular-lenses
#2
A-S Villemont, V Kocaba, H Janin-Manificat, L Abouaf, M Poli, A-S Marty, M Rabilloud, J Fleury, C Burillon
PURPOSE: To evaluate the long-term outcomes of artificial iris intraocular lenses sutured to the sclera for managing traumatic aphakia and aniridia. METHODS: All consecutive cases receiving a Morcher(®) combination implant from June 2008 to February 2016 in Edouard-Herriot Hospital (Lyon, France) were included in this single-center retrospective study. Visual acuity, subjective degree of glare, quality of life and surgical complications were evaluated. RESULTS: Seventeen eyes of 17 patients were included, among which 82% were male...
August 9, 2017: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/28782627/electrical-stimulation-of-different-retinal-components-and-the-effect-of-asymmetric-pulses
#3
Dorit Raz-Prag, Giora Beit-Yaakov, Yael Hanein
BACKGROUND: High resolution electrical stimulation of neural tissue is a fundamental challenge in applications such as deep brain stimulation and artificial vision. In artificial vision, achieving and validating local selective epi-retinal stimulation of different layers in the retina is particularly challenging owing to plurality of retinal cell types and delocalized wiring. RESULTS: Strong selectivity and non-localized responses to epi-retinal stimulation, over a wide range of realistic stimulation parameters, was achieved and validated using asymmetric pulses...
August 3, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28777356/health-effects-of-carotenoids-during-pregnancy-and-lactation
#4
REVIEW
Monika A Zielińska, Aleksandra Wesołowska, Beata Pawlus, Jadwiga Hamułka
Adequate nutrition is particularly important during pregnancy since it is needed not only for maintaining the health of the mother, but also determines the course of pregnancy and its outcome, fetus development as well as the child's health after birth and during the later period of life. Data coming from epidemiological and interventions studies support the observation that carotenoids intake provide positive health effects in adults and the elderly population. These health effects are the result of their antioxidant and anti-inflammatory properties...
August 4, 2017: Nutrients
https://www.readbyqxmd.com/read/28758207/the-potential-of-computer-vision-optical-backscattering-parameters-and-artificial-neural-network-modelling-in-monitoring-the-shrinkage-of-sweet-potato-ipomoea-batatas-l-during-drying
#5
Daniel I Onwude, Norhashila Hashim, Khalina Abdan, Rimfiel Janius, Guangnan Chen
BACKGROUND: Drying is a method used to preserve agricultural crops. During the drying of products with high moisture content, structural changes in shape, volume, area, density and porosity occur. This changes could affect the final quality of dried product and also the effective design of drying equipment. Therefore, this study investigated a novel approach in monitoring and predicting the shrinkage of sweet potato during drying. Drying experiments were conducted at temperatures of 50-70 °C and samples thicknesses of 2 - 6 mm...
July 30, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28746814/probabilistic-computations-for-attention-eye-movements-and-search
#6
Miguel P Eckstein
The term visual attention immediately evokes the idea of limited resources, serial processing, or a zoom metaphor. But evidence has slowly accumulated that computations that take into account probabilistic relationships among visual forms and the target contribute to optimizing decisions in biological and artificial organisms, even without considering these limited-capacity processes in covert attention or even foveation. The benefits from such computations can be formalized within the framework of an ideal Bayesian observer and can be related to the classic theory of sensory cue combination in vision science and context-driven approaches to object detection in computer vision...
July 26, 2017: Annual Review of Vision Science
https://www.readbyqxmd.com/read/28743725/altered-balance-of-receptive-field-excitation-and-suppression-in-visual-cortex-of-amblyopic-macaque-monkeys
#7
Luke E Hallum, Christopher Shooner, Romesh D Kumbhani, Jenna G Kelly, Virginia García-Marín, Najib J Majaj, J Anthony Movshon, Lynne Kiorpes
In amblyopia, a visual disorder caused by abnormal visual experience during development, the amblyopic eye loses visual sensitivity while the other (fellow) eye is largely unaffected. Binocular vision in amblyopes is often disrupted by interocular suppression. We used 96-electrode arrays to record neurons and neuronal groups in areas V1 and V2 of 6 female monkeys (Macaca nemestrina) made amblyopic by artificial strabismus or anisometropia in early life, as well as 2 visually normal female monkeys (Macaca nemestrina)...
July 25, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28732233/piecewise-convexity-of-artificial-neural-networks
#8
Blaine Rister, Daniel L Rubin
Although artificial neural networks have shown great promise in applications including computer vision and speech recognition, there remains considerable practical and theoretical difficulty in optimizing their parameters. The seemingly unreasonable success of gradient descent methods in minimizing these non-convex functions remains poorly understood. In this work we offer some theoretical guarantees for networks with piecewise affine activation functions, which have in recent years become the norm. We prove three main results...
July 3, 2017: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/28704206/an-autonomous-robot-inspired-by-insect-neurophysiology-pursues-moving-features-in-natural-environments
#9
Zahra M Bagheri, Benjamin S Cazzolato, Steven Grainger, David C O'Carroll, Steven D Wiederman
OBJECTIVE: Many computer vision and robotic applications require the implementation of robust and efficient target-tracking algorithms on a moving platform. However, deployment of a real-time system is challenging, even with the computational power of modern hardware. Lightweight and low-powered flying insects, such as dragonflies, track prey or conspecifics within cluttered natural environments, illustrating an efficient biological solution to the target-tracking problem. APPROACH: We used our recent recordings from 'small target motion detector' neurons in the dragonfly brain to inspire the development of a closed-loop target detection and tracking algorithm...
July 13, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28701559/optimal-background-matching-camouflage
#10
Constantine Michalis, Nicholas E Scott-Samuel, David P Gibson, Innes C Cuthill
Background matching is the most familiar and widespread camouflage strategy: avoiding detection by having a similar colour and pattern to the background. Optimizing background matching is straightforward in a homogeneous environment, or when the habitat has very distinct sub-types and there is divergent selection leading to polymorphism. However, most backgrounds have continuous variation in colour and texture, so what is the best solution? Not all samples of the background are likely to be equally inconspicuous, and laboratory experiments on birds and humans support this view...
July 12, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28689314/overview-of-deep-learning-in-medical-imaging
#11
REVIEW
Kenji Suzuki
The use of machine learning (ML) has been increasing rapidly in the medical imaging field, including computer-aided diagnosis (CAD), radiomics, and medical image analysis. Recently, an ML area called deep learning emerged in the computer vision field and became very popular in many fields. It started from an event in late 2012, when a deep-learning approach based on a convolutional neural network (CNN) won an overwhelming victory in the best-known worldwide computer vision competition, ImageNet Classification...
July 8, 2017: Radiological Physics and Technology
https://www.readbyqxmd.com/read/28664995/assessment-of-beer-quality-based-on-foamability-and-chemical-composition-using-computer-vision-algorithms-near-infrared-spectroscopy-and-artificial-neural-networks-modelling-techniques
#12
Claudia Gonzalez Viejo, Sigfredo Fuentes, Damir Torrico, Kate Howell, Frank R Dunshea
BACKGROUND: Beer quality is mainly defined by its color, foamability and foam stability, which are influenced by the chemical composition of the product such as proteins, carbohydrates, pH and alcohol. Traditional methods to assess specific chemical compounds are usually time-consuming and costly. This study used rapid methods to evaluate 15 foam and color-related parameters using a robotic pourer (RoboBEER) and chemical fingerprinting using near infrared spectrometry (NIR) from six replicates of 21 beers from three types of fermentation...
June 30, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28649802/punctal-occlusion-for-dry-eye-syndrome
#13
REVIEW
Ann-Margret Ervin, Andrew Law, Andrew D Pucker
BACKGROUND: Dry eye syndrome is a disorder of the tear film that is associated with symptoms of ocular discomfort. Punctal occlusion is a mechanical treatment that blocks the tear drainage system in order to aid in the preservation of natural tears on the ocular surface. OBJECTIVES: To assess the effects of punctal plugs versus no punctal plugs, different types of punctal plugs, and other interventions for managing dry eye. SEARCH METHODS: We searched the Cochrane Central Register of Controlled Trials (CENTRAL) (which contains the Cochrane Eyes and Vision Trials Register) (2016, Issue 11), MEDLINE Ovid (1946 to 8 December 2016), Embase...
June 26, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28624710/role-of-impaired-vision-during-dual-task-walking-in-young-and-older-adults
#14
Vennila Krishnan, Young-Hee Cho, Olfat Mohamed
While cognitive-motor interference in dual-task activities is well established, it is still unknown how such interference is influenced by concurrent visual challenges. Nineteen community-dwelling healthy, cognitively intact, older adults (Mean±SD=71.45±1.25years, 6 males) and nineteen young adults (Mean±SD=22.25±0.68years, 4 males) performed a cognitive-single-task (serial subtraction by 3), a walking-single-task and a cognitive-walking-dual-task under normal, blurred and peripheral-vision-loss conditions (artificially imposed using goggles)...
June 10, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28622318/characteristics-of-symptoms-experienced-by-persons-with-dry-eye-disease-while-driving-in-china
#15
Y Wang, H Lv, Y Liu, X Jiang, M Zhang, X Li, W Wang
PurposeTo assess the vision-related quality of life and self-reported driving performance of patients with dry eye disease (DED).Patients and methodsThe study was performed in the eye centre of Peking University Third Hospital, China. In total, 87 dry eye patients and 42 controls were enroled, including 49 patients without any treatment (group A), 38 patients treated with artificial tears (group B) and 42 controls without DED (group C). The participants had no eye disease other than DED. Scores of a vision-related quality-of-life questionnaire (Ocular Surface Disease Index (OSDI)), a daily life-related visual function questionnaire and a questionnaire about performance during driving were collected...
June 16, 2017: Eye
https://www.readbyqxmd.com/read/28617724/intracorneal-inlays-for-the-correction-of-presbyopia
#16
Perry S Binder
The current nonsurgical approaches for the correction of presbyopia are spectacles or contact lenses or the use of pharmaceuticals to create an artificial pupil and/or to stimulate residual accommodation. Refractive surgical procedures use a monovision approach and/or a multifocal corneal laser ablation with or without the induction of negative spherical aberration to improve near vision. More recently, new surgical approaches include intracorneal inlays. Inlay approaches include increasing corneal curvature alone, implanting a multifocal inlay, or by implanting a small aperture device that functions as a pinhole to restore unaided near and intermediate visual acuity...
June 14, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28612282/probing-of-peripheral-blood-mononuclear-cells-anchoring-on-tnf-alpha-challenged-vascular-endothelia-in-an-in-vitro-model-of-the-retinal-microvascular
#17
Yuan Li, Yao Lu, Qiong Chen, Yuejun Kang, Ling Yu
Retinopathy is a complication of diabetes that affects the eyes; it stems from damage to the microvasculature of the retina and eventually compromises vision. The diagnosis of retinopathy is difficult to make because there are no early symptoms or warning signs. Dysfunction of the retina's microvascular networks is believed to be associated with inflammatory cytokines and tumor necrosis factor alpha (TNF-α). To investigate the effect of these cytokines, such as TNF-α, a polydimethylsiloxane (PDMS)/glass hydride microfluidic device reflecting the physiological structure of the retina's microvasculature was developed...
September 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28611460/chlorophyll-derivatives-enhance-invertebrate-red-light-and-ultraviolet-phototaxis
#18
Andrea Degl'Innocenti, Leonardo Rossi, Alessandra Salvetti, Attilio Marino, Gabriella Meloni, Barbara Mazzolai, Gianni Ciofani
Chlorophyll derivatives are known to enhance vision in vertebrates. They are thought to bind visual pigments (i.e., opsins apoproteins bound to retinal chromophores) directly within the retina. Consistent with previous findings in vertebrates, here we show that chlorin e6 - a chlorophyll derivative - enhances photophobicity in a flatworm (Dugesia japonica), specifically when exposed to UV radiation (λ = 405 nm) or red light (λ = 660 nm). This is the first report of chlorophyll derivatives acting as modulators of invertebrate phototaxis, and in general the first account demonstrating that they can artificially alter animal response to light at a behavioral level...
June 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28602017/design-and-evaluation-of-artificial-cornea-with-core-skirt-design-using-polyhydroxyethyl-methacrylate-and-graphite
#19
Mukty Sinha, Tanvi Gupte
PURPOSE: Artificial cornea is the effective treatment option for corneal blindness. One of the challenges with the artificial cornea is limited, or no tissue integration necessitates reimplantation due to necrosis or corneal melting. We propose here a new formulation approach for core-skirt incorporating graphite in the outer skirt region to improve cell adhesion. METHODS: Hydroxyethyl methacrylate (HEMA) and ethylene glycol dimethacrylate were procured from Sigma-Aldrich...
June 10, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28591156/dark-eyes-in-female-sand-gobies-indicate-readiness-to-spawn
#20
Karin H Olsson, Sandra Johansson, Eva-Lotta Blom, Kai Lindström, Ola Svensson, Helen Nilsson Sköld, Charlotta Kvarnemo
In animals, colorful and conspicuous ornaments enhance individual attractiveness to potential mates, but are typically tempered by natural selection for crypsis and predator protection. In species where males compete for females, this can lead to highly ornamented males competing for mating opportunities with choosy females, and vice versa. However, even where males compete for mating opportunities, females may exhibit conspicuous displays. These female displays are often poorly understood and it may be unclear whether they declare mating intent, signal intrasexual aggression or form a target for male mate preference...
2017: PloS One
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