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https://www.readbyqxmd.com/read/28092548/linear-spectral-clustering-superpixel
#1
Jiansheng Chen, Zhengqin Li, Bo Huang
In this paper, we present a superpixel segmentation algorithm called linear spectral clustering (LSC), which is capable of producing superpixels with both high boundary adherence and visual compactness for natural images with low computational costs. In LSC, a normalized cuts based formulation of image segmentation is adopted using a distance metric that measures both the color similarity and the space proximity between image pixels. However, rather than directly using the traditional eigen-based algorithm, we approximate the similarity metric through a deliberately designed kernel function such that pixel values can be explicitly mapped to a high-dimensional feature space...
January 11, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28079755/macular-pigment-distribution-responses-to-high-dose-zeaxanthin-supplementation-in-patients-with-macular-telangiectasia-type-2
#2
Rene Y Choi, Aruna Gorusupudi, Kimberley Wegner, Mohsen Sharifzadeh, Werner Gellermann, Paul S Bernstein
PURPOSE: To analyze macular pigment (MP) amount and distribution in patients with macular telangiectasia Type 2 receiving oral zeaxanthin supplementation in a randomized, open-label, interventional trial. METHODS: Eight macular telangiectasia Type 2 patients were randomized to 10 mg or 20 mg of zeaxanthin per day. At each visit, best-corrected visual acuity, contrast sensitivity, fundus biomicroscopy, color fundus photography, autofluorescence imaging, optical coherence tomography, and serum carotenoid levels were tested...
January 10, 2017: Retina
https://www.readbyqxmd.com/read/28079243/serum-levels-of-vitamin-a-visual-function-and-ocular-surface-after-bariatric-surgery
#3
Luana Paula Nogueira de Araújo Brandão, Lucio Vilar, Bernardo Menelau Cavalcanti, Pedro Henrique Amorim Brandão, Tiago Eugênio Faria E Arantes, Josemberg Marins Campos
BACKGROUND: - Bariatric surgery is the most effective treatment for severe obesity, but the surgery increases the risk of developing nutritional deficiencies, such as vitamin A deficiency. In human metabolism, vitamin A plays a role in vision. OBJECTIVE: - To evaluate serum vitamin A, visual function and ocular surface of patients undergoing bariatric surgery. METHODS: - A cross-sectional and analytical study was conduced with 28 patients undergoing bariatric surgery for at least 6 months...
January 2017: Arquivos de Gastroenterologia
https://www.readbyqxmd.com/read/28076391/assessing-sexual-dicromatism-the-importance-of-proper-parameterization-in-tetrachromatic-visual-models
#4
Pierre-Paul Bitton, Kevyn Janisse, Stéphanie M Doucet
Perceptual models of animal vision have greatly contributed to our understanding of animal-animal and plant-animal communication. The receptor-noise model of color contrasts has been central to this research as it quantifies the difference between two colors for any visual system of interest. However, if the properties of the visual system are unknown, assumptions regarding parameter values must be made, generally with unknown consequences. In this study, we conduct a sensitivity analysis of the receptor-noise model using avian visual system parameters to systematically investigate the influence of variation in light environment, photoreceptor sensitivities, photoreceptor densities, and light transmission properties of the ocular media and the oil droplets...
2017: PloS One
https://www.readbyqxmd.com/read/28073247/tuning-for-visible-fluorescence-and-near-infrared-phosphorescence-on-a-unimolecular-mechanically-sensitive-platform-via-adjustable-ch-%C3%AF-interaction
#5
Hongwei Wu, Pei Zhao, Xin Li, Wenbo Chen, Hans Ågren, Qing Zhang, Liangliang Zhu
CH-π interaction assisted alignment of organic conjugated systems has played an important role to regulate molecular electronic and photophysical properties, whereas harnessing such a smart non-covalent interaction into the tuning of unimolecular complex emissive bands covering a wide spectral region remains a challenging research topic. Since the tuning for visible and near-infrared emissive properties in a single π-functional platform relates to its multi-color luminescent behaviors and potential superior application in analysis, imaging and sensing, we here report that a proportional control of the singlet and triplet emissions that cover visible and near-infrared spectral region, respectively, can be straightforwardly achieved by CH-π interaction assisted self-assembly at the unimolecular level...
January 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28054470/color-relationalism-and-relativism
#6
Alex Byrne, David R Hilbert
This paper critically examines color relationalism and color relativism, two theories of color that are allegedly supported by variation in normal human color vision. We mostly discuss color relationalism, defended at length in Jonathan Cohen's The Red and the Real, and argue that the theory has insuperable problems.
January 5, 2017: Topics in Cognitive Science
https://www.readbyqxmd.com/read/28054342/diversity-of-photoreceptor-arrangements-in-nocturnal-cathemeral-and-diurnal-malagasy-lemurs
#7
Leo Peichl, Alexander Kaiser, Felix Rakotondraparany, Richard R Dubielzig, Steven M Goodman, And Peter M Kappeler
The lemurs of Madagascar (Primates: Lemuriformes) are a monophyletic group that has lived in isolation from other primates for about 50 million years. Lemurs have diversified into species with diverse daily activity patterns and correspondingly different visual adaptations. We assessed the arrangements of retinal cone and rod photoreceptors in six nocturnal, three cathemeral and two diurnal lemur species and quantified different parameters in six of the species. The analysis revealed lower cone densities and higher rod densities in the nocturnal than in the cathemeral and diurnal species...
January 5, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28048975/head-mounted-display-technology-for-low-vision-rehabilitation-and-vision-enhancement
#8
Joshua R Ehrlich, Lauro V Ojeda, Donna Wicker, Sherry Day, Ashley Howson, Vasudevan Lakshminarayanan, Sayoko E Moroi
PURPOSE: To describe the various types of head-mounted display technology, their optical and human factors considerations, and their potential for use in low vision rehabilitation and vision enhancement. DESIGN: Expert perspective. METHODS: An overview of head-mounted display technology by an interdisciplinary team of experts drawing on key literature in the field. RESULTS: Head-mounted display technologies can be classified based on their display type and optical design...
December 31, 2016: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28048504/th-c-204-00-medical-physics-workshop-an-update-on-the-journal-s-improvement-activities-and-guidance-on-writing-and-reviewing-papers
#9
Jeffrey Williamson
In this presentation, the Editors will outline our vision for the future of Medical Physics and review recent work-in-progress initiatives to implement this vision. Finally, we will close with guidance to authors on how to write a good Medical Physics paper. A major focus will be the transition to a new publisher in 2017 following a more than 40-year association with American Institute of Physics Publishing (AIPP). Vision for Medical Physics and status of current initiatives: Jeff Williamson, Editor-in-Chief The broad vision of Medical Physics is "to continue the Journal's tradition of publishing the very best science that propels our discipline forward and improves our contribution to patient care...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048316/th-c-204-03-writing-good-scientific-papers-and-responding-to-critiques
#10
M Goodsitt
In this presentation, the Editors will outline our vision for the future of Medical Physics and review recent work-in-progress initiatives to implement this vision. Finally, we will close with guidance to authors on how to write a good Medical Physics paper. A major focus will be the transition to a new publisher in 2017 following a more than 40-year association with American Institute of Physics Publishing (AIPP). Vision for Medical Physics and status of current initiatives: Jeff Williamson, Editor-in-Chief The broad vision of Medical Physics is "to continue the Journal's tradition of publishing the very best science that propels our discipline forward and improves our contribution to patient care...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047330/tu-fg-206-01-standards-support-for-color-in-medical-imaging
#11
M Flynn
The field of imaging informatics is a subfield of biomedical informatics that combines medical physics with computer, clinical, and cognitive sciences. In this session jointly sponsored with the Society of Imaging Informatics in Medicine, we will provide an overview of the field starting with the highly applied role of information technology working with imaging modalities to research areas in computer vision, annotation markup, and semantic ontologies that can leverage machine encoded reasoning systems. We will highlight new technologies that are beneficial to medical physicists conducting research as well as translating research into clinical practice...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046896/th-c-204-01-vision-for-medical-physics-and-status-of-current-initiatives
#12
J Williamson
In this presentation, the Editors will outline our vision for the future of Medical Physics and review recent work-in-progress initiatives to implement this vision. Finally, we will close with guidance to authors on how to write a good Medical Physics paper. A major focus will be the transition to a new publisher in 2017 following a more than 40-year association with American Institute of Physics Publishing (AIPP). Vision for Medical Physics and status of current initiatives: Jeff Williamson, Editor-in-Chief The broad vision of Medical Physics is "to continue the Journal's tradition of publishing the very best science that propels our discipline forward and improves our contribution to patient care...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046238/th-c-204-02-improving-manuscript-quality-via-structured-reviews-enhanced-scientific-category-taxonomy-and-outreach
#13
S Das
In this presentation, the Editors will outline our vision for the future of Medical Physics and review recent work-in-progress initiatives to implement this vision. Finally, we will close with guidance to authors on how to write a good Medical Physics paper. A major focus will be the transition to a new publisher in 2017 following a more than 40-year association with American Institute of Physics Publishing (AIPP). Vision for Medical Physics and status of current initiatives: Jeff Williamson, Editor-in-Chief The broad vision of Medical Physics is "to continue the Journal's tradition of publishing the very best science that propels our discipline forward and improves our contribution to patient care...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28045251/a-g-protein-coupled-receptor-dimerization-interface-in-human-cone-opsins
#14
Beata Jastrzebska, William D Comar, Megan J Kaliszewski, Kevin C Skinner, Morgan H Torcasio, Anthony S Esway, Hui Jin, Krzysztof Palczewski, Adam W Smith
G protein-coupled receptors (GPCRs) detect a wide variety of physical and chemical signals and transmit that information across the cellular plasma membrane. Dimerization is a proposed modulator of GPCR signaling, but the structure and stability of class A GPCR dimerization have been difficult to establish. Here we investigated the dimerization affinity and binding interface of human cone opsins, which initiate and sustain daytime color vision. Using a time-resolved fluorescence approach, we found that human red cone opsin exhibits a strong propensity for dimerization, whereas the green and blue cone opsins do not...
November 29, 2016: Biochemistry
https://www.readbyqxmd.com/read/28042057/variations-in-normal-color-vision-vii-relationships-between-color-naming-and-hue-scaling
#15
Kara J Emery, Vicki J Volbrecht, David H Peterzell, Michael A Webster
A longstanding and unresolved question is how observers construct a discrete set of color categories to partition and label the continuous variations in light spectra, and how these categories might reflect the neural representation of color. We explored the properties of color naming and its relationship to color appearance by analyzing individual differences in color-naming and hue-scaling patterns, using factor analysis of individual differences to identify separate and shared processes underlying hue naming (labeling) and hue scaling (color appearance)...
January 5, 2017: Vision Research
https://www.readbyqxmd.com/read/28035885/differential-survival-between-visual-environments-supports-a-role-of-divergent-sensory-drive-in-cichlid-fish-speciation
#16
Martine E Maan, Ole Seehausen, Ton G G Groothuis
Identifying the selective forces that initiate ecological speciation is a major challenge in evolutionary biology. Sensory drive has been implicated in speciation in various taxa, largely based on phenotype-environment correlations and signatures of selection in sensory genes. Here, we present a reciprocal transplant experiment revealing species differences in performance in alternative visual environments, consistent with speciation by divergent sensory drive. The closely related cichlids Pundamilia pundamilia and Pundamilia nyererei inhabit different visual environments in Lake Victoria and show associated differences in visual system properties...
January 2017: American Naturalist
https://www.readbyqxmd.com/read/28027639/helical-self-assembly-induced-singlet-triplet-emissive-switching-in-a-mechanically-sensitive-system
#17
Hongwei Wu, Yunyun Zhou, Liyuan Yin, Cheng Hang, Xin Li, Hans Ågren, Tao Yi, Qing Zhang, Liangliang Zhu
In nanoscience, chirality has shown a significant ability to tune materials' electronic properties, whereas imposing macrochirality into the regulation of singlet-triplet features of organic optoelectronics remains a challenging research topic. Since the tuning for singlet and triplet excited-state properties in a single π-functional molecule connects to its multicolor luminescent application and potential improvement of internal quantum efficiency, we here report that supramolecular chirality can be employed to toggle the singlet and triplet emissions in a well-designed asterisk-shaped molecule...
January 10, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28026764/a-new-intrinsic-lighting-color-space-for-daytime-outdoor-images
#18
Zhi Han, Jiandong Tian, Liangqiong Qu, Yandong Tang
Extracting or separating intrinsic information and illumination from natural images is crucial for better solving computer vision tasks. In this paper, we present a new illumination-based color space, the IL (intrinsic information and lighting level) space. Its first two channels represent twodimensional intrinsic information, and the third channel is for lighting levels. The IL color space has a one-to-one correspondence with the RGB color space. One valuable benefit of the IL color space is that illumination-related processing can be realized by directly operating on the lighting channel...
December 21, 2016: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28025051/variations-in-normal-color-vision-vi-factors-underlying-individual-differences-in-hue-scaling-and-their-implications-for-models-of-color-appearance
#19
Kara J Emery, Vicki J Volbrecht, David H Peterzell, Michael A Webster
Observers with normal color vision vary widely in their judgments of color appearance, such as the specific spectral stimuli they perceive as pure or unique hues. We examined the basis of these individual differences by using factor analysis to examine the variations in hue-scaling functions from both new and previously published data. Observers reported the perceived proportion of red, green, blue or yellow in chromatic stimuli sampling angles at fixed intervals within the LM and S cone-opponent plane. These proportions were converted to hue angles in a perceptual-opponent space defined by red vs...
January 3, 2017: Vision Research
https://www.readbyqxmd.com/read/28008209/paradigm-shifts-in-ophthalmic-diagnostics
#20
J Sebag, Alfredo A Sadun, Eric A Pierce
PURPOSE: Future advances in ophthalmology will see a paradigm shift in diagnostics from a focus on dysfunction and disease to better measures of psychophysical function and health. Practical methods to define genotypes will be increasingly important and non-invasive nanotechnologies are needed to detect molecular changes that predate histopathology. METHODS: This is not a review nor meant to be comprehensive. Specific topics have been selected to illustrate the principles of important paradigm shifts that will influence the future of ophthalmic diagnostics...
August 2016: Transactions of the American Ophthalmological Society
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