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https://www.readbyqxmd.com/read/29048021/3d-pose-estimation-of-large-and-complicated-workpieces-based-on-binocular-stereo-vision
#1
Zhifeng Luo, Ke Zhang, Zhigang Wang, Jian Zheng, Yixin Chen
A binocular stereo vision method is proposed for automatically locating the position and posture of workpieces, which is especially important when processing large, complicated structures, for example, the laser hardening and laser cladding of automotive die. First, a binocular stereo vision positioning system was designed and modeled, from which a method of background subtraction was proposed to extract the edge line of the foreground area. Furthermore, the intersection point of the workpiece contour line was taken as the characteristic point of the workpiece, and an algorithm that combines epipolar constraint with gray value similarity was proposed to quickly and accurately realize the feature points matching...
August 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047884/optimization-based-non-cooperative-spacecraft-pose-estimation-using-stereo-cameras-during-proximity-operations
#2
Limin Zhang, Feng Zhu, Yingming Hao, Wang Pan
Pose estimation for spacecraft is widely recognized as an important technology for space applications. Many space missions require accurate relative pose between the chaser and the target spacecraft. Stereo-vision is a usual mean to estimate the pose of non-cooperative targets during proximity operations. However, the uncertainty of stereo-vision measurement is still an outstanding issue that needs to be solved. With binocular structure and the geometric structure of the object, we present a robust pose estimation method for non-cooperative spacecraft...
May 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047696/full-reference-quality-assessment-of-stereoscopic-images-by-learning-binocular-visual-properties
#3
Jian Ma, Ping An, Liquan Shen, Kai Li
Stereoscopic imaging technology has been growingly prevalent driven by both the entertainment industry and scientific applications in today's world. But objective quality assessment of stereoscopic images is a challenging task. In this paper, we propose a novel stereoscopic image quality assessment (SIQA) method by jointly considering monocular perception and binocular interaction. As the most significant contribution of this study, binocular perceptual properties of simple and complex cells are considered for full-reference (FR) SIQA...
October 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29046833/optical-techniques-for-cervical-neoplasia-detection
#4
REVIEW
Tatiana Novikova
This paper provides an overview of the current research in the field of optical techniques for cervical neoplasia detection and covers a wide range of the existing and emerging technologies. Using colposcopy, a visual inspection of the uterine cervix with a colposcope (a binocular microscope with 3- to 15-fold magnification), has proven to be an efficient approach for the detection of invasive cancer. Nevertheless, the development of a reliable and cost-effective technique for the identification of precancerous lesions, confined to the epithelium (cervical intraepithelial neoplasia) still remains a challenging problem...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29033538/comparison-of-a-hydrogel-corneal-inlay-and-monovision-laser-in-situ-keratomileusis-in-presbyopic-patients-focus-on-visual-performance-and-optical-quality
#5
Cornelis Verdoorn
PURPOSE: To compare the visual performance and optical quality after Raindrop Near Vision Inlay implantation or monovision LASIK for the correction of presbyopia. MATERIALS AND METHODS: In this retrospective case-series study, patients previously treated in the nondominant eye with monovision LASIK were compared with patients previously implanted with Raindrop Near Vision Inlay. The study enrolled 16 inlay and 15 monovision LASIK patients. Uncorrected near visual acuity, uncorrected distance visual acuity, binocular stereopsis, patient satisfaction, and patient task performance were assessed...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/29033061/predicting-vision-related-disability-in-glaucoma
#6
Ricardo Y Abe, Alberto Diniz-Filho, Vital P Costa, Zhichao Wu, Felipe A Medeiros
PURPOSE: To present a new methodology for investigating predictive factors associated with development of vision-related disability in glaucoma. DESIGN: Prospective, observational cohort study. PARTICIPANTS: Two hundred thirty-six patients with glaucoma followed up for an average of 4.3±1.5 years. METHODS: Vision-related disability was assessed by the 25-item National Eye Institute Visual Function Questionnaire (NEI VFQ-25) at baseline and at the end of follow-up...
October 12, 2017: Ophthalmology
https://www.readbyqxmd.com/read/29025170/-the-motor-development-of-children-with-infantile-esotropia
#7
Julia Dillmann, Claudia Freitag, Kerstin Holve, Silke Schweinfurth, Birgit Lorenz, Gudrun Schwarzer
Background Until now, many studies have investigated the link between motor development and visual-spatial abilities in infancy and childhood. Most of these studies found evidence that there is such a link in typically developing children or children with locomotor delay. Only a few studies have tested the consequences of this link in children with abnormal visual development because of infantile esotropia. Moreover, little is known about the effects of late surgery on motor development. Patients and Methods We assessed the motor abilities of 3- to 7-year old children with severe deficits in stereopsis due to infantile esotropia (angle ≥ 12°) and typically developing children prior to and 12 to 16 months after surgery...
October 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/29025168/-a-model-explaining-infantile-esotropia-dissociated-strabismus-as-a-result-of-sensory-interhemispheric-dissociation-and-crossed-dominance-in-the-brainstem
#8
Marcel Paulus Ten Tusscher
Over 150 million years, modern reptiles, birds and mammals evolved. Predatory birds and mammals have eyes on the front of their heads. In these animals, binocular correspondence, voluntary eye movements, eye-hand coordination, partial decussation at the optic chiasm and cortical interhemispheric pathways could develop at the cost of a smaller visual field. The subsequent enlargement of the cerebral neocortex and the hemispheric pathways are of central importance in binocular vision, sensory fusion and infantile strabismus...
October 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/29024763/slow-reading-in-children-with-anisometropic-amblyopia-is-associated-with-fixation-instability-and-increased-saccades
#9
Krista R Kelly, Reed M Jost, Angie De La Cruz, Lori Dao, Cynthia L Beauchamp, David Stager, Eileen E Birch
BACKGROUND: Previous studies show slow reading in strabismic amblyopia. We recently identified amblyopia, not strabismus, as the key factor in slow reading in children. No studies have focused on reading in amblyopic children without strabismus. We examined reading in anisometropic children and evaluated whether slow reading was associated with ocular motor dysfunction in children with amblyopia. METHODS: Anisometropic children (7-12 years) with or without amblyopia were compared to age-similar normal controls...
October 9, 2017: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
https://www.readbyqxmd.com/read/29023717/recovery-from-the-anatomical-effects-of-long-term-monocular-deprivation-in-cat-lateral-geniculate-nucleus
#10
Kevin R Duffy, Ming-Fai Fong, Donald E Mitchell, Mark F Bear
Monocular deprivation (MD) imposed early in postnatal life elicits profound structural and functional abnormalities throughout the primary visual pathway. The ability of MD to modify neurons within the visual system is restricted to a so-called critical period that, for cats, peaks at about one postnatal month and declines thereafter so that by about 3 months of age MD has little effect. Recovery from the consequences of MD likewise adheres to a critical period that ends by about 3 months of age, after which the effects of deprivation are thought to be permanent and without capacity for reversal...
October 11, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/29023501/cognitive-processing-of-orientation-discrimination-in-anisometropic-amblyopia
#11
Jianglan Wang, Jiao Zhao, Shoujing Wang, Rui Gong, Zhong Zheng, Longqian Liu
Cognition is very important in our daily life. However, amblyopia has abnormal visual cognition. Physiological changes of the brain during processes of cognition could be reflected with ERPs. So the purpose of this study was to investigate the speed and the capacity of resource allocation in visual cognitive processing in orientation discrimination task during monocular and binocular viewing conditions of amblyopia and normal control as well as the corresponding eyes of the two groups with ERPs. We also sought to investigate whether the speed and the capacity of resource allocation in visual cognitive processing vary with target stimuli at different spatial frequencies (3, 6 and 9 cpd) in amblyopia and normal control as well as between the corresponding eyes of the two groups...
2017: PloS One
https://www.readbyqxmd.com/read/29018158/suppression-and-contrast-normalization-in-motion-processing
#12
Christian Quaia, Lance M Optican, Bruce G Cumming
Sensory neurons are activated by a range of stimuli, to which they are said to be tuned. Usually, they are also suppressed by another set of stimuli, which have little effect when presented in isolation. The interactions between preferred and suppressive stimuli are often quite complex, and vary across neurons, even within a single area, making it difficult to infer their collective effect on behavioral responses mediated by activity across populations of neurons. Here we investigated this issue by measuring, in human subjects (three males), the suppressive effect of static masks on the ocular following responses induced by moving stimuli...
October 10, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28993094/characterization-of-diplopia-in-non-demented-patients-with-parkinson-s-disease
#13
Katharina A Schindlbeck, Shideh Schönfeld, Wanda Naumann, David J Friedrich, André Maier, Charlotte Rewitzer, Fabian Klostermann, Frank Marzinzik
INTRODUCTION: Although diplopia is considered a frequent symptom of Parkinson's disease (PD), little is known about its clinical manifestation, associated mechanisms and treatment. Here we characterized binocular diplopia in non-demented PD patients in an interdisciplinary setting. METHODS: PD patients were prospectively screened for diplopia, visual hallucinations, problems with spatial perception, contrast sensitivity, presence of blurred vision, and history of ophthalmological comorbidities via interview...
September 29, 2017: Parkinsonism & related Disorders
https://www.readbyqxmd.com/read/28991350/neuroanatomical-structures-in-human-extraocular-muscles-and-their-potential-implication-in-the-development-of-oculomotor-disorders
#14
Ala Paduca, Jan Richard Bruenech
The potential role of sensory feedback from human extraocular muscles has been subjected to considerable speculation in the ophthalmic literature. Extraocular muscles pull against a fairly even load and do not initiate a stretch reflex, even when the eyes are directed toward the boundaries of their respective field of action. These unique working conditions and physiological properties have led to the notion that the sensory signal arising from receptors in extraocular muscles differs from the conventional proprioceptive signal arising from their somatic counterparts...
October 9, 2017: Journal of Pediatric Ophthalmology and Strabismus
https://www.readbyqxmd.com/read/28991332/visual-performance-with-bifocal-and-trifocal-diffractive-intraocular-lenses-a-prospective-three-armed-randomized-multicenter-clinical-trial
#15
Hakan Kaymak, Detlev Breyer, Jorge L Alió, Beatrice Cochener
PURPOSE: To evaluate and compare quality of vision and reading performance outcomes after implantation of bifocal refractive-diffractive, bifocal apodized diffractive, or trifocal diffractive-refractive intraocular lenses (IOLs). METHODS: This randomized, prospective, three-armed multicenter (Spain, Germany, and France) trial included 104 eyes of 52 patients (mean age: 63.2 ± 7.7 years). Patients underwent cataract surgery with bilateral implantation of either AT LISA 809M (Carl Zeiss Meditec, Jena, Germany: AT LISA group, 38 eyes), AT LISA tri 839MP (Carl Zeiss Meditec: AT LISA tri group, 32 eyes), or ReSTOR SN6AD1 (Alcon Laboratories, Inc...
October 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28988650/learning-curve-of-endoscopic-pituitary-surgery-experience-of-a-neurosurgery-ent-collaboration
#16
Giorgio Lofrese, Vera Vigo, Mario Rigante, Domenico Luca Grieco, Maddalena Maresca, Carmelo Anile, Annunziato Mangiola, Pasquale De Bonis
For neurosurgeons, who are accustomed to the binocular microscope, there is a new learning curve that must be overcome for monocular endoscopic pituitary surgery. Different studies describe a learning curve between 15 and 200 procedures, after which both operative time and complications stabilize. In this retrospective study, we evaluate the endoscopic learning curve of our group, already trained in microsurgical transsphenoidal surgery, with the assistance of ear, nose, and throat (ENT) surgeons. From 2010 to 2015, a total of 95 patients with pituitary adenomas were treated with a purely endoscopic approach...
October 5, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28986596/palisade-endings-of-extraocular-muscles-develop-postnatally-following-different-time-courses
#17
COMPARATIVE STUDY
Roland Blumer, Johannes Streicher, María A Davis-López de Carrizosa, Rosa R de la Cruz, Angel M Pastor
Purpose: To analyze in a frontal-eyed mammal (cat) the postnatal development of palisade endings in extraocular muscles (EOMs) and to compare the spatiotemporal and quantitative patterns of palisade endings among individual rectus muscles. Methods: Cats of different ages ranging from birth to adult stage were studied. EOM whole-mount preparations were fluorescently labeled using six combinations of triple staining and analyzed in the confocal laser scanning microscope...
October 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28985799/teaching-binocular-indirect-ophthalmoscopy-to-novice-residents-using-an-augmented-reality-simulator
#18
Amandeep S Rai, Amrit S Rai, Emmanouil Mavrikakis, Wai Ching Lam
OBJECTIVE: To compare the traditional teaching approach of binocular indirect ophthalmoscopy (BIO) to the EyeSI augmented reality (AR) BIO simulator. DESIGN: Prospective randomized control trial. PARTICIPANTS: 28 post-graduate year one (PGY1) ophthalmology residents. METHODS: Residents were recruited at the 2012 Toronto Ophthalmology Residents Introductory Course (TORIC). 15 were randomized to conventional teaching (Group 1), and 13 to augmented reality simulator training (Group 2)...
October 2017: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
https://www.readbyqxmd.com/read/28980564/-%C3%B0-comparative-analysis-of-the-magnitude-of-the-distance-and-lens-induced-objective-accommodative-response-in-patients-with-different-refraction
#19
E P Tarutta, N A Tarasova, S G Аrutyunyan, M V Maksimova
AIM: To study the magnitude of objective accommodative response (OAR) with account to the method of image defocusing. The latter can be realized by bringing the object nearer to the eye or by adding a minus lens in front of the viewer. MATERIAL AND METHODS: We examined 63 patients (126 eyes) with different refraction aged from 7 to 31 years. All patients underwent a series of OAR measurements on WR-5100K Grand Seiko Binocular Open-Field Autorefkeratometer under different conditions, including negative spherical lenses of -3...
2017: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/28980562/-structural-retinal-and-optic-nerve-changes-in-patients-with-post-geniculate-visual-pathway-damage
#20
N M Eliseeva, N K Serova, V P Erichev, L A Panyushkina
AIM: To establish the possibility of retrograde trans-synaptic neural degeneration following acquired post-geniculate visual pathway damage. MATERIAL AND METHODS: Twenty-two patients with homonymous hemianopia caused by acquired post-geniculate visual pathway damage were examined. Peripapillary retinal nerve fiber layer (RNFL) thickness and ganglion cell complex (GCC) measurements were assessed with RTVue-100 Fourier-domain optical coherence tomography (OCT). RESULTS: In 12 out of 22 patients we detected binocular GCC thinning that was ipsilateral to post-geniculate involvement...
2017: Vestnik Oftalmologii
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