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https://www.readbyqxmd.com/read/28635629/light-emitting-marker-for-robust-vision-based-on-the-spot-bacterial-growth-detection
#1
Kyukwang Kim, Jieum Hyun, Jessie S Jeon
Simple methods using the striped pattern paper marker and FFT (fast Fourier transformation) have been proposed as alternatives to measuring the optical density for determining the level of bacterial growth. The marker-based method can be easily automated, but due to image-processing-base of the method, the presence of light or the color of the culture broth can disturb the detection process. This paper proposes a modified version of marker-FFT-based growth detection that uses a light emitting diode (LED) array as a marker...
June 21, 2017: Sensors
https://www.readbyqxmd.com/read/28625199/color-vision-test-to-differentiate-alzheimer-s-disease-from-vascular-dementia
#2
Tomoyuki Kawada
Arnaoutoglou et al. (2017) reported that "Ishihara Color Vision Test - 38 Plate" was useful for the differential diagnosis of dementia between Alzheimer's Disease (AD) and Vascular Dementia (VaD). The authors used sensitivity/specificity analysis, presenting 80.6% and 87.5% to discriminate AD and VaD patients when an optimal (32.5) cut-off value of performance was used. The authors cited a reference of the fact that AD patients suffered from a non-specific type of color blindness (Pache et al., 2003), and I have a query on their study with special reference to statistical method...
June 19, 2017: International Psychogeriatrics
https://www.readbyqxmd.com/read/28616959/smelling-seeing-tasting-old-senses-for-new-sensing
#3
Luca Guerrini, Eduardo Garcia-Rico, Nicolas Pazos-Perez, Ramon A Alvarez-Puebla
The senses are the physiological mechanisms of perception that enable an organism to interact with the surrounding media. For centuries, humans have utilized these senses in science; vision and olfaction have been used the most extensively in laboratories followed by gustation and somatosensation, whereas audition has only rarely been employed. Most of these applications of senses were developed spontaneously based on the natural behavior of the chemistry of the reactants producing changes in scent, taste, or color...
June 15, 2017: ACS Nano
https://www.readbyqxmd.com/read/28615496/experimental-evidence-that-primate-trichromacy-is-well-suited-for-detecting-primate-social-colour-signals
#4
Chihiro Hiramatsu, Amanda D Melin, William L Allen, Constance Dubuc, James P Higham
Primate trichromatic colour vision has been hypothesized to be well tuned for detecting variation in facial coloration, which could be due to selection on either signal wavelengths or the sensitivities of the photoreceptors themselves. We provide one of the first empirical tests of this idea by asking whether, when compared with other visual systems, the information obtained through primate trichromatic vision confers an improved ability to detect the changes in facial colour that female macaque monkeys exhibit when they are proceptive...
June 14, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28606265/-the-fundus-manifestations-and-sd-oct-findings-of-patients-with-acute-vogt-koyanagi-harada-disease
#5
B Li, J J Ye, M F Zhang, D H Li
Objective: To conclude the characteristics of fundus appearance and spectral domain optical coherence tomography(SD-OCT) findings of patients with acute Vogt-Koyanagi-Harada (VKH) disease. Methods: The clinical data of 17 patients (34 eyes) diagnosed of acute VKH in Peking Union Medical College Hospital from Jan. 2012 to Dec. 2014 were studied retrospectively.Examinations included visual acuity, slit lamp, fundus, color fundus pictures, FFA and SD-OCT. Results: Eight men and 9 women were enrolled with mean age of (40...
June 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28596918/physical-activity-and-quality-of-life-in-retinitis-pigmentosa
#6
Joshua D Levinson, Ethan Joseph, Laura A Ward, Joe R Nocera, Machelle T Pardue, Beau B Bruce, Jiong Yan
PURPOSE: Aerobic exercise has been found to be neuroprotective in animal models of retinal degeneration. This study aims to report physical activity levels in patients with RP and investigate the relationship between physical activity and vision-related quality-of-life (QOL). MATERIALS AND METHODS: A retrospective study of adult patients with RP examined in 2005-2014. Physical activity levels were assessed using the Godin Exercise Questionnaire. The NEI-Visual Function Questionaire-25 (VFQ-25), SF-36 General Health survey, and Pepper Assessment Tool for Disability (PAT-D) were administered...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28596720/aav-mediated-gene-supplementation-therapy-in-achromatopsia-type-2-preclinical-data-on-therapeutic-time-window-and-long-term-effects
#7
Regine Mühlfriedel, Naoyuki Tanimoto, Christian Schön, Vithiyanjali Sothilingam, Marina Garcia Garrido, Susanne C Beck, Gesine Huber, Martin Biel, Mathias W Seeliger, Stylianos Michalakis
Achromatopsia type 2 (ACHM2) is a severe, inherited eye disease caused by mutations in the CNGA3 gene encoding the α subunit of the cone photoreceptor cyclic nucleotide-gated (CNG) channel. Patients suffer from strongly impaired daylight vision, photophobia, nystagmus, and lack of color discrimination. We have previously shown in the Cnga3 knockout (KO) mouse model of ACHM2 that gene supplementation therapy is effective in rescuing cone function and morphology and delaying cone degeneration. In our preclinical approach, we use recombinant adeno-associated virus (AAV) vector-mediated gene transfer to express the murine Cnga3 gene under control of the mouse blue opsin promoter...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28591810/hessian-fly-diptera-cecidomyiidae-attraction-to-different-wavelengths-and-intensities-of-light-emitting-diodes-in-the-laboratory
#8
Ryan B Schmid, Darren Snyder, Lee W Cohnstaedt, Brian P McCornack
Monitoring of Hessian fly, Mayetiola destructor (Say) (Diptera: Cecidomyiidae), populations is important for targeted management methods. Also, effectiveness of monitoring efforts is critical to surveillance efforts in regions of the world without this pest. Current Hessian fly monitoring traps rely purely on a single attractant, the female sex pheromone, which is ineffective for monitoring females in the population. Our objective was to examine another attractant targeting vision of both males and females...
June 7, 2017: Environmental Entomology
https://www.readbyqxmd.com/read/28591156/dark-eyes-in-female-sand-gobies-indicate-readiness-to-spawn
#9
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
https://www.readbyqxmd.com/read/28587192/high-dynamic-range-spectral-imaging-pipeline-for-multispectral-filter-array-cameras
#10
Pierre-Jean Lapray, Jean-Baptiste Thomas, Pierre Gouton
Spectral filter arrays imaging exhibits a strong similarity with color filter arrays. This permits us to embed this technology in practical vision systems with little adaptation of the existing solutions. In this communication, we define an imaging pipeline that permits high dynamic range (HDR)-spectral imaging, which is extended from color filter arrays. We propose an implementation of this pipeline on a prototype sensor and evaluate the quality of our implementation results on real data with objective metrics and visual examples...
June 3, 2017: Sensors
https://www.readbyqxmd.com/read/28585431/sensory-quality-evaluation-for-appearance-of-needle-shaped-green-tea-based-on-computer-vision-and-nonlinear-tools
#11
Chun-Wang Dong, Hong-Kai Zhu, Jie-Wen Zhao, Yong-Wen Jiang, Hai-Bo Yuan, Quan-Sheng Chen
Tea is one of the three greatest beverages in the world. In China, green tea has the largest consumption, and needle-shaped green tea, such as Maofeng tea and Sparrow Tongue tea, accounts for more than 40% of green tea (Zhu et al., 2017). The appearance of green tea is one of the important indexes during the evaluation of green tea quality. Especially in market transactions, the price of tea is usually determined by its appearance (Zhou et al., 2012). Human sensory evaluation is usually conducted by experts, and is also easily affected by various factors such as light, experience, psychological and visual factors...
June 2017: Journal of Zhejiang University. Science. B
https://www.readbyqxmd.com/read/28584229/circadian-tunable-perovskite-quantum-dot-based-down-converted-multi-package-white-led-with-a-color-fidelity-index-over-90
#12
Hee Chang Yoon, Ji Hye Oh, Soyoung Lee, Jae Byung Park, Young Rag Do
New metrics of the color and circadian performances of down-converted white light-emitting diodes (DC-WLEDs) are rapidly becoming popular in smart lighting systems. This is due to the increased desire for accurate analytical methods to measure the effects of newly developed quantum dot (QD)-based lighting on the vision, color, and circadian sensors of retina cells in the human eye. In this regard, a two-measure system known as technical memorandum TM-30-2015 (Illuminating Engineering Society of North America), encompassing the color fidelity index (CFI, R f ) and the color gamut index (CGI, R g ), has been developed as a new metrics of color to replace the currently utilized color rendering index (CRI, R a )...
June 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28577364/factors-associated-with-impaired-color-vision-without-retinopathy-amongst-people-with-type-2-diabetes-mellitus-a-cross-sectional-study
#13
N C Tan, W F Yip, S Kallakuri, U Sankari, Y L E Koh
BACKGROUND: Patients with type 2 diabetes mellitus (T2DM) may develop color vision impairment. This study aimed to determine the prevalence and factors associated with impaired color vision in patients with T2DM but without diabetic retinopathy. METHODS: Enrolment criteria included multi-ethnic Asian participants, age 21 to 80 years, with known T2DM for a minimum of 2 years. Their diagnoses were affirmed from oral glucose tolerance test results and they were screened for impaired color vision using the Farnsworth D-15 instrument...
June 2, 2017: BMC Endocrine Disorders
https://www.readbyqxmd.com/read/28572101/effect-of-ph-test-strip-characteristics-on-accuracy-of-readings
#14
Norma A Metheny, Emily M Gunn, Cynthia S Rubbelke, Terrilynn Fox Quillen, Uthayashanker R Ezekiel, Kathleen L Meert
BACKGROUND: Little is known about characteristics of colorimetric pH test strips that are most likely to be associated with accurate interpretations in clinical situations. OBJECTIVES: To compare the accuracy of 4 pH test strips with varying characteristics (ie, multiple vs single colorimetric squares per calibration, and differing calibration units [1.0 vs 0.5]). METHODS: A convenience sample of 100 upper-level nursing students with normal color vision was recruited to evaluate the accuracy of the test strips...
June 2017: Critical Care Nurse
https://www.readbyqxmd.com/read/28558391/breaking-object-correspondence-across-saccades-impairs-object-recognition-the-role-of-color-and-luminance
#15
Christian H Poth, Werner X Schneider
Rapid saccadic eye movements bring the foveal region of the eye's retina onto objects for high-acuity vision. Saccades change the location and resolution of objects' retinal images. To perceive objects as visually stable across saccades, correspondence between the objects before and after the saccade must be established. We have previously shown that breaking object correspondence across the saccade causes a decrement in object recognition (Poth, Herwig, & Schneider, 2015). Color and luminance can establish object correspondence, but it is unknown how these surface features contribute to transsaccadic visual processing...
September 1, 2016: Journal of Vision
https://www.readbyqxmd.com/read/28552126/hue-texture-embedded-region-based-model-for-magnifying-endoscopy-with-narrow-band-imaging-image-segmentation-based-on-visual-features
#16
Xiaoqi Liu, Chengliang Wang, Jianying Bai, Guobin Liao, Yanjun Zhao
BACKGROUND AND OBJECTIVE: Magnification endoscopy with narrow-band imaging (ME-NBI) has become a feasible tool for detecting diseases within the human gastrointestinal tract, and is more applied by physicians to search for pathological abnormalities with gastric cancer such as precancerous lesions, early gastric cancer and advanced cancer. In order to improve the reliability of diseases detection, there is a need for applying or proposing computer-assisted methodologies to efficiently analyze and process ME-NBI images...
July 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28546509/behavioral-color-vision-in-a-cichlid-fish-metriaclima-benetos
#17
Daniel Escobar-Camacho, Justin Marshall, Karen L Carleton
Color vision is the capacity of discriminating color regardless of brightness. It is essential for many fish species as they rely on color discrimination for numerous ecological tasks. The study of color vision is important because it can unveil the mechanisms that shape coloration patterns, visual system sensitivities and hence, visual signals. In order to understand better the mechanisms underlying color vision an integrative approach is necessary. This usually requires combining behavioral, physiological, and genetic experiments with quantitative modeling, resulting in a distinctive characterization of the visual system...
May 25, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28545983/feedback-from-higher-to-lower-visual-areas-for-visual-recognition-may-be-weaker-in-the-periphery-glimpses-from-the-perception-of-brief-dichoptic-stimuli
#18
Li Zhaoping
Eye movements bring attended visual inputs to the center of vision for further processing. Thus, central and peripheral vision should have different functional roles. Here, we use observations of visual perception under dichoptic stimuli to infer that there is a difference in the top-down feedback from higher brain centers to primary visual cortex. Visual stimuli to the two eyes were designed such that the sum and difference of the binocular input from the two eyes have the form of two different gratings. These gratings differed in their motion direction, tilt direction, or color, and duly evoked ambiguous percepts for the corresponding feature...
June 6, 2017: Vision Research
https://www.readbyqxmd.com/read/28541233/quaternion-locality-constrained-coding-for-color-face-hallucination
#19
Licheng Liu, Shutao Li, C L Philip Chen
Recently, the locality linear coding (LLC) has attracted more and more attentions in the areas of image processing and computer vision. However, the conventional LLC with real setting is just designed for the grayscale image. For the color image, it usually treats each color channel individually or encodes the monochrome image by concatenating all the color channels, which ignores the correlations among different channels. In this paper, we propose a quaternion-based locality-constrained coding (QLC) model for color face hallucination in the quaternion space...
May 23, 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28540010/changes-in-choroidal-perfusion-after-orbital-decompression-surgery-for-graves-ophthalmopathy
#20
Narieman Nik, Amelia Fong, Marianna Derdzakyan, Chrysavgi Adamopoulou, Adam Sise, Aziz Khanifar, Reginald Sanders
PURPOSE: To assess choroidal perfusion before and after orbital decompression surgery in patients with Graves' ophthalmopathy. METHODS: In this interventional case series, surgical decompression for optic nerve compromise was performed on four eyes of three patients with Graves' disease. Complete ophthalmic examination including visual acuity, color vision, and intraocular pressure assessment were done pre- and postoperatively. High-speed indocyanine green angiography was performed prior to surgery and was repeated one year after surgery...
April 2017: Journal of Ophthalmic & Vision Research
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