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You searched for subject:(Fixation Disparity). Showing records 1 – 3 of 3 total matches.

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Universidade do Minho

1. Machado, Tiago Miguel Silva. A influência da iluminação colorida na visão binocular .

Degree: 2019, Universidade do Minho

A luz tem influência em vários pontos do nosso dia a dia. Cada vez mais estamos expostos a inúmeras variações de iluminação, tanto no ambiente que nos rodeia como durante utilização de dispositivos digitais. É sabido que esta provoca sintomatologia quando é inadequada para a tarefa que estamos a realizar. Assim sendo, este estudo tem como objetivo examinar se a cor da iluminação provoca ou não alterações a nível da visão binocular. Para tal, a recolha de dados consistiu em duas fases. Numa primeira fase, foi realizado um exame optométrico completo a 37 sujeitos, onde apenas foram incluídos aqueles com AVVL com correção ≥ 1,0, refração entre -2.00D e +2.00 D, sem astigmatismo, sem disfunções acomodativas e da visão binocular e visão das cores normal. Assim, selecionaram-se 24 sujeitos com idades entre os 19 e os 30 anos (22,3 ± 3,03 anos), onde 79,2% eram do sexo feminino. Realizou-se a medição de forias, reservas fusionais positivas e negativas, e disparidade de fixação com diferentes cores de iluminação de forma randomizada (branco, verde e vermelho). Verificou-se a existência de alterações significativas nos valores das forias e das reservas fusionais. Para os valores das forias foi detetado uma alteração de 2 Δ entre as iluminações verde e branca (p = 0,021) e entre as iluminações verde e vermelha (p = 0,007). Para as reservas fusionais foram detetadas alterações estatisticamente significativas para os valores das rotura e recuperação da reserva fusional negativa e para a recuperação da reserva fusional positiva. As diferenças encontradas para o valor da foria podem ser explicadas pela aberração cromática longitudinal, onde o valor da exoforia com a iluminação verde era maior. A baixa repetibilidade do método foi considerada como o principal fator para as diferenças encontradas para os valores das reservas fusionais. Já para a disparidade de fixação não se obteve qualquer diferença estatisticamente significativa. Advisors/Committee Members: Franco, Sandra (advisor), Linhares, João M. M (advisor).

Subjects/Keywords: Disparidade de fixação; Foria; Iluminação; Reservas fusionais; Visão binocular; Binocular vision; Fixation disparity; Fusional vergence; Illumination; Phoria

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Machado, T. M. S. (2019). A influência da iluminação colorida na visão binocular . (Masters Thesis). Universidade do Minho. Retrieved from http://hdl.handle.net/1822/66609

Chicago Manual of Style (16th Edition):

Machado, Tiago Miguel Silva. “A influência da iluminação colorida na visão binocular .” 2019. Masters Thesis, Universidade do Minho. Accessed April 14, 2021. http://hdl.handle.net/1822/66609.

MLA Handbook (7th Edition):

Machado, Tiago Miguel Silva. “A influência da iluminação colorida na visão binocular .” 2019. Web. 14 Apr 2021.

Vancouver:

Machado TMS. A influência da iluminação colorida na visão binocular . [Internet] [Masters thesis]. Universidade do Minho; 2019. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/1822/66609.

Council of Science Editors:

Machado TMS. A influência da iluminação colorida na visão binocular . [Masters Thesis]. Universidade do Minho; 2019. Available from: http://hdl.handle.net/1822/66609

2. Khaustova, Darya. Objective assessment of stereoscopic video quality of 3DTV : Évaluation objective de la qualité vidéo en TV 3D relief.

Degree: Docteur es, Informatique, 2015, Rennes 1

Le niveau d'exigence minimum pour tout système 3D (images stéréoscopiques) est de garantir le confort visuel des utilisateurs. Le confort visuel est un des trois axes perceptuels de la qualité d'expérience (QoE) 3D qui peut être directement lié aux paramètres techniques du système 3D. Par conséquent, le but de cette thèse est de caractériser objectivement l'impact de ces paramètres sur la perception humaine afin de contrôler la qualité stéréoscopique. La première partie de la thèse examine l'intérêt de prendre en compte l'attention visuelle des spectateurs dans la conception d'une mesure objective de qualité 3D. Premièrement, l'attention visuelle en 2D et 3D sont comparées en utilisant des stimuli simples. Les conclusions de cette première expérience sont validées en utilisant des scènes complexes avec des disparités croisées et décroisées. De plus, nous explorons l'impact de l'inconfort visuel causé par des disparités excessives sur l'attention visuelle. La seconde partie de la thèse est dédiée à la conception d'un modèle objectif de QoE pour des vidéos 3D, basé sur les seuils perceptuels humains et le niveau d'acceptabilité. De plus nous explorons la possibilité d'utiliser la modèle proposé comme une nouvelle échelle subjective. Pour la validation de ce modèle, des expériences subjectives sont conduites présentant aux sujets des images stéréoscopiques fixes et animées avec différents niveaux d'asymétrie. La performance est évaluée en comparant des prédictions objectives avec des notes subjectives pour différents niveaux d'asymétrie qui pourraient provoquer un inconfort visuel.

The minimum requirement for any 3D (stereoscopic images) system is to guarantee visual comfort of viewers. Visual comfort is one of the three primary perceptual attributes of 3D QoE, which can be linked directly with technical parameters of a 3D system. Therefore, the goal of this thesis is to characterize objectively the impact of these parameters on human perception for stereoscopic quality monitoring. The first part of the thesis investigates whether visual attention of the viewers should be considered when designing an objective 3D quality metrics. First, the visual attention in 2D and 3D is compared using simple test patterns. The conclusions of this first experiment are validated using complex stimuli with crossed and uncrossed disparities. In addition, we explore the impact of visual discomfort caused by excessive disparities on visual attention. The second part of the thesis is dedicated to the design of an objective model of 3D video QoE, which is based on human perceptual thresholds and acceptability level. Additionally we explore the possibility to use the proposed model as a new subjective scale. For the validation of proposed model, subjective experiments with fully controlled still and moving stereoscopic images with different types of view asymmetries are conducted. The performance is evaluated by comparing objective predictions with subjective scores for various levels of view discrepancies which might provoke visual…

Advisors/Committee Members: Guillemot, Christine (thesis director), Le Meur, Olivier (thesis director).

Subjects/Keywords: Vidéo 3D; Métrique objective; Échelle de couleur; Évaluation subjective; Acceptabilité; Gêne visuelle; Évaluation de la qualité vidéo; Asymétrie entre les vues; Confort visuel; Attention visuelle; Profondeur; Texture; Carte de saillance; Mouvement saccade; Temps de fixationdisparité; 3D video; Objective metric; Color scale; Subjective assessment; Acceptability; Visual annoyance; Views asymmetry; Visual comfort; Video quality assessment; Human factors; Visual attention; Depth; Texture; Saliency map; Depth map; Saccade length; Fixation duration; Disparity

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Khaustova, D. (2015). Objective assessment of stereoscopic video quality of 3DTV : Évaluation objective de la qualité vidéo en TV 3D relief. (Doctoral Dissertation). Rennes 1. Retrieved from http://www.theses.fr/2015REN1S021

Chicago Manual of Style (16th Edition):

Khaustova, Darya. “Objective assessment of stereoscopic video quality of 3DTV : Évaluation objective de la qualité vidéo en TV 3D relief.” 2015. Doctoral Dissertation, Rennes 1. Accessed April 14, 2021. http://www.theses.fr/2015REN1S021.

MLA Handbook (7th Edition):

Khaustova, Darya. “Objective assessment of stereoscopic video quality of 3DTV : Évaluation objective de la qualité vidéo en TV 3D relief.” 2015. Web. 14 Apr 2021.

Vancouver:

Khaustova D. Objective assessment of stereoscopic video quality of 3DTV : Évaluation objective de la qualité vidéo en TV 3D relief. [Internet] [Doctoral dissertation]. Rennes 1; 2015. [cited 2021 Apr 14]. Available from: http://www.theses.fr/2015REN1S021.

Council of Science Editors:

Khaustova D. Objective assessment of stereoscopic video quality of 3DTV : Évaluation objective de la qualité vidéo en TV 3D relief. [Doctoral Dissertation]. Rennes 1; 2015. Available from: http://www.theses.fr/2015REN1S021

3. Alhassan, Mosaad. MKH-Haase Charts of Binocular Vision Measurements: Repeatability and Validity of Associated Phoria and Stereotests.

Degree: 2014, University of Waterloo

Abstract Introduction: H.J.-Haase developed a systematic set of tests for evaluating binocular vision called the Pola Test. The Pola Test measures associated phoria and stereoacuity at distance and near using a variety of different targets for each. This testing method and interpretation is referred to as MKH-Haase (Measuring and Correcting Methodology after H.J.Haase –the MKH) method. The MKH method is more commonly used in Germany and other European countries than English speaking countries. The MKH-Haase method has been considered a reliable method for prescribing prisms to symptomatic binocular vision patients. Purpose: To investigate the test-retest reliability of binocular vision measurements using the MKH-Haase series of tests that comprise the Pola Test. In addition, I will compare the Pola results with other associated phoria and stereoacuity tests used in North America. Methods: Thirty-four symptomatic and 40 asymptomatic subjects (based on a symptoms questionnaire) participated in this study. Associated phoria and stereoacuity with different tests, including the Pola Test at distance and near, were measured for those subjects on two different sessions. Not all of subjects were tested with all tests. Only 30 subjects in each group completed all of tests. The Pola Test protocol requires the associated phoria and stereoacuity to be measured twice within a session; once with the Polariods oriented with their axes at 45o and 135o and again with the axes switched. Results: Within and between-sessions repeatability of MKH-Haase associated phoria and stereoacuity tests results revealed that most of MKH-Haase associated phoria and stereoacuity tests showed good repeatability within and between-sessions at both distance and near. However, there were a few exceptions to this general finding. Distance horizontal associated phoria values for the Cross Test and Pointer Test at the first session, and the distance Double Pointer Test values at the second session showed some differences between the two views. Between-sessions repeatability of the associated phoria tests did not show any significant differences. For the stereoacuity tests, the differences between the two disparities were statistically significant at the first session for the symptomatic group Line Test and asymptomatic group Step Test. For the second session at distance, the differences were significant with Step Test for both groups. The differences between sessions for both disparities were not significant for most of tests. The symptomatic group’s Step Test for crossed disparity and asymptomatic group's Step Test for uncrossed disparity were exceptions. A repeated measures ANOVA test was conducted to compare different associated phoria tests. Horizontal associated phoria tests without central fusion lock were significantly different from those with central fusion lock at distance and near. Comparison of different stereoacuity tests was conducted by comparing the number of subjects who could identify specific stereothreshold values.…

Subjects/Keywords: Pola Test; MKH-Haase Charts; Associated Phoria; Stereoacuity; Fixation Disparity; Stereo Balance Test; Stereo Triangle Test; Ocular Prevalence; Stereo Delay; Binocular Vision

…96 6.5 Within and between-session repeatability of Fixation Disparity Type II according to… …136 viii List of Figures Figure 1: Forced Vergence Fixation Disparity Curve… …7 Figure 2: Forced Fixation Disparity Curve Type 1… …9 Figure 3: Forced Fixation Disparity Curve Type 2… …9 Figure 4: Forced Fixation Disparity Curve Type 3… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Alhassan, M. (2014). MKH-Haase Charts of Binocular Vision Measurements: Repeatability and Validity of Associated Phoria and Stereotests. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/8238

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Alhassan, Mosaad. “MKH-Haase Charts of Binocular Vision Measurements: Repeatability and Validity of Associated Phoria and Stereotests.” 2014. Thesis, University of Waterloo. Accessed April 14, 2021. http://hdl.handle.net/10012/8238.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Alhassan, Mosaad. “MKH-Haase Charts of Binocular Vision Measurements: Repeatability and Validity of Associated Phoria and Stereotests.” 2014. Web. 14 Apr 2021.

Vancouver:

Alhassan M. MKH-Haase Charts of Binocular Vision Measurements: Repeatability and Validity of Associated Phoria and Stereotests. [Internet] [Thesis]. University of Waterloo; 2014. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/10012/8238.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Alhassan M. MKH-Haase Charts of Binocular Vision Measurements: Repeatability and Validity of Associated Phoria and Stereotests. [Thesis]. University of Waterloo; 2014. Available from: http://hdl.handle.net/10012/8238

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.