Relevant bibliographies by topics / Indice visuel

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Indice visuel'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 February 2022

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Journal articles on the topic "Indice visuel"

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Giraud, J. M., J. R. Fenolland, F. May, O. Hammam, A. M. Sadat, A. Bey Boumezrag, and J. P. Renard. "Analyse d’un nouvel indice d’évaluation du champ visuel, le VFI, dans l’hypertonie oculaire et le glaucome." Journal Français d'Ophtalmologie 33, no. 1 (January 2010): 2–9. http://dx.doi.org/10.1016/j.jfo.2009.11.004.

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Giraud, J. M., K. Reda, F. May, J. R. Fenolland, R. Dariel, A. Nicaise, J. F. Maurin, and J. P. Renard. "475 Analyse d’un nouvel indice d’évaluation du champ visuel, le VFI, dans l’hypertonie oculaire et le glaucome." Journal Français d'Ophtalmologie 32 (April 2009): 1S147–1S148. http://dx.doi.org/10.1016/s0181-5512(09)73599-5.

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Heijl, Anders, Georg Lindgren, Jonny Olsson, and Peter �smanl. "On weighted visual field indices." Graefe's Archive for Clinical and Experimental Ophthalmology 230, no. 4 (1992): 397–98. http://dx.doi.org/10.1007/bf00165953.

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Hardage, Lani, and Robert L. Stamper. "Reliability Indices for Automated Visual Fields." Ophthalmology 96, no. 12 (December 1989): 1810. http://dx.doi.org/10.1016/s0161-6420(89)32969-1.

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Flammer, Josef. "The concept of visual field indices." Graefe's Archive for Clinical and Experimental Ophthalmology 224, no. 5 (September 1986): 389–92. http://dx.doi.org/10.1007/bf02173350.

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Valsecchi, Matteo, Elena Betta, and Massimo Turatto. "Visual oddballs induce prolonged microsaccadic inhibition." Experimental Brain Research 177, no. 2 (September 2, 2006): 196–208. http://dx.doi.org/10.1007/s00221-006-0665-6.

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Jamnik, Jure, and Gregor Zvelc. "The Embodiment of Power and Visual Dominance Behaviour." Interdisciplinary Description of Complex Systems 15, no. 4 (2017): 228–41. http://dx.doi.org/10.7906/indecs.15.4.1.

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Van der Burg, Erik, Mark R. Nieuwenstein, Jan Theeuwes, and Christian N. L. Olivers. "Irrelevant Auditory and Visual Events Induce a Visual Attentional Blink." Experimental Psychology 60, no. 2 (November 1, 2013): 80–89. http://dx.doi.org/10.1027/1618-3169/a000174.

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In the present study we investigated whether a task-irrelevant distractor can induce a visual attentional blink pattern. Participants were asked to detect only a visual target letter (A, B, or C) and to ignore the preceding auditory, visual, or audiovisual distractor. An attentional blink was observed regardless of the distractor modality. The magnitude of the attentional blink was greater when the target was preceded by a visual or an audiovisual distractor than when the target letter was preceded by an auditory distractor. The presence of a distractor-induced attentional blink regardless of the distractor modality suggests that the attentional blink phenomenon is at least partly due to an amodal processing limitation.
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Yamamoto, Sakae, and Takaaki Koyazu. "The effect of indices on visual search." Japanese journal of ergonomics 29, Supplement (1993): 464–65. http://dx.doi.org/10.5100/jje.29.supplement_464.

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SULLIVAN, MICHELE G. "Hypoglycemia Can Induce Visual Disturbances in Diabetes." Family Practice News 38, no. 18 (September 2008): 12. http://dx.doi.org/10.1016/s0300-7073(08)71168-x.

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Dissertations / Theses on the topic "Indice visuel"

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Jouvin-Marie, dit Dinard Fanny. "Stratégies d'exploration visuelle : processus de sélection des indices visuels pertinents pour l'action." Caen, 2007. http://www.theses.fr/2007CAEN1500.

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L'exploration visuelle peut être envisagée comme un bon modèle pour l'étude des relations perception action. Dans cette perspective, nous nous intéressons particulièrement aux processus de sélection des indices visuels. Afin de sélectionner l'information pertinente, l'individu met en place de véritables stratégies d'exploration visuelle pouvant être mises en évidence au moyen de patrons oculaires représentant la succession chronologique des mouvements des yeux. L'analyse des mouvements oculaires permet en partie de mettre en évidence les processus cognitifs sous-tendant les stratégies de recherche perceptive. Les facteurs déterminant les stratégies d'exploration visuelle, sont liés à la structure de la scène visuelle mais aussi à des caractéristiques propres à l'individu telles que ses représentations. Certaines, comme l'intention ou le but, sont primordiales dans l'élaboration des stratégies. Quatre expérimentations en laboratoire sont mises en place pour documenter l'effet de ces facteurs sur l'exploration visuelle. Nos résultats permettent d'avancer que les stratégies perceptivo-motrices sont chaque fois élaborées de manière cohérente avec le but poursuivi dans une situation donnée. Elles sont dépendantes de l'intention d'action, de la congruence et de la spécificité de l'action par rapport à l'environnement. De plus, un but implicite suffit à leur mise en place même si une assignation explicite de ce but les rend plus efficaces
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Bertrand, Raphaëlle. "Maintien à court terme de l'information chez l'enfant de 2 à 6 ans : oubli temporel et aide au maintien du but." Thesis, Dijon, 2014. http://www.theses.fr/2014DIJOL023/document.

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La mémoire de travail est un composant essentiel de la pensée qui est fortement impliquée dans les apprentissages et la réussite scolaires. Pourtant, elle est rarement étudiée chez l’enfant d’âge préscolaire, du fait notamment d’un manque de paradigmes adaptés. Cette thèse visait donc à étudier le fonctionnement de la mémoire de travail chez cette population, soit entre 2 et 6 ans. Pour cela, deux paradigmes originaux ont été utilisés. Ils ont été conçus pour être proches de situations de jeux, propices à aider le jeune enfant à focaliser son attention sur la tâche. Ainsi, il a tout d’abord été montré que les performances de rappel diminuaient au fil du temps, et ce, même en l’absence de tâche interférente. Les enfants de cette tranche d’âge opèrent donc un maintien passif de l’information, i.e. sans mise en œuvre spontanée de stratégie de maintien de l’information. De plus, le déclin de l’information était similaire au travers de l’âge. Pour la première fois, il a donc été mis en évidence que la vitesse d’oubli de l’information ne variait pas entre 2 et 6 ans. Finalement, aucun de ces deux facteurs, i.e. mise en œuvre de stratégie de maintien de l’information et modification de la vitesse d’oubli de l’information, ne peut être avancé pour expliquer l’augmentation des capacités mémorielles entre 2 et 6 ans. Ensuite, il a été montré que les caractéristiques intrinsèques de la tâche pouvaient conduire à une amélioration des performances de rappel, peut-être par la mise en œuvre d’une stratégie de maintien. Notamment, la réalisation d’une activité motrice, i.e. marche durant le délai de rétention, a permis à ces jeunes enfants de contrecarrer dans une certaine mesure l’oubli temporel de l’information. La mise en œuvre d’une activité motrice, en dirigeant l’attention du jeune enfant vers un indice visuel du but à atteindre, aiderait celui-ci à maintenir le but de la tâche en mémoire. Les ressources attentionnelles ainsi dégagées pourraient être mises au service d’une amélioration des performances de rappel, peut-être par la mise en œuvre d’une stratégie de maintien
Working memory is an essential component of thought that is highly involved in learning and academic achievement. However, it is rarely studied in preschoolers, mainly because of a lack of suitable paradigms. Therefore, this thesis investigated the functioning of working memory in children between 2 and 6 years. For this purpose, two original paradigms were used. They were designed to be close to game situations which should help young children to focus their attention on the task. Firstly it was shown that the recall performance decreased over time, even in the absence of an interfering task. Children of this age therefore use a passive maintenance, i.e. without spontaneously implementing any strategy of maintenance. Furthermore, the decline of the information was similar through age. For the first time, it has been demonstrated that the rate of information forgetting did not vary between 2 and 6. Finally, none of these two factors, i.e. implementation of a strategy of maintenance and change in the speed of forgetting can explain the increase in memory capacity between 2 and 6 years of age. Secondly, it has been shown that the intrinsic characteristics of the task could lead to improved recall performance, perhaps by inducing a strategy of maintenance. Particularly, the implementation of a motor activity, i.e. walking during the retention period, has enabled these young children to counteract to some extent the temporal decay of information. Then, the implementation of a motor activity, by directing the attention of young children to a visual cue related to the goal of the task, help them to maintain in memory the purpose of the task. Attentional resources could be harnessed to improve performance of recall, perhaps by implementing a retention strategy
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Nébouy, David. "Printing quality assessment by image processing and color prediction models." Thesis, Saint-Etienne, 2015. http://www.theses.fr/2015STET4018/document.

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L'impression, bien qu'étant une technique ancienne pour la coloration de surfaces, a connu un progrès considérable ces dernières années essentiellement grâce à la révolution du numérique. Les professionnels souhaitant remplir les exigences en termes de qualité du rendu visuel de leurs clients veulent donc savoir dans quelle mesure des observateurs humains sont sensibles à la dégradation d'une image. De telles questions concernant la qualité perçue d'une image reproduite peuvent être séparées en deux sujets différents: La qualité de l'impression, comme la capacité d'un système d'impression à reproduire fidèlement l'image d'origine, et la qualité d'une image imprimée, résultant à la fois de la qualité de reproduction, mais aussi de la qualité même de l'image numérique d'origine. Ce premier concept repose sur une analyse physique de la façon dont l'image d'origine est dégradée lors de son transfert sur un support, et nous proposons de la coupler avec une analyse sensorielle, visant à évaluer des attributs perceptuels et leur donner une valeur sur une certaine échelle, déterminée par des échantillons de référence classés par un ensemble d'observateurs. Le second concept inclut cette dégradation due à l’impression mais aussi la qualité perçu de l’image d’origine, qui ne fait pas parti de notre étude. Notre approche consiste d'abord à définir les différents indices de qualité, basés sur des critères mesurables en utilisant des outils d'évaluation basés sur des algorithmes "objectifs" de traitement d'image et des modèles optiques, sur une image imprimée-scannée. Thèse réalisée au Laboratoire Hubert Curien
Printing, though an old technique for surface coloration, considerably progressed these last decades especially thanks to the digital revolution. Professionals who want to meet the demands in terms of quality regarding the visual rendering of their clients thus want to know to which extent human observers are sensitive to the degradation of an image. Such questions regarding the perceived quality of a reproduced image can be split into two different topics: the printing quality as capacity of a printing system of accurately reproduce an original digital image, and the printed image quality which results from both the reproduction quality and the quality of the original image itself. The first concept relies on physical analysis of the way the original image is deteriorated when transferred onto the support, and we propose to couple it with a sensorial analysis, which aims at assessing perceptual attributes by giving them a value on a certain scale, determined with respect to reference samples classified by a set of observers. The second concept includes the degradation due to the printing plus the perceived quality of the original image, not in the scope of this work. In this report, we focus on the printing quality concept. Our approach first consists in the definition of several printing quality indices, based on measurable criteria using assessment tools based on “objective” image processing algorithms and optical models on a printed-then-scanned image. PhD work made in Hubert Curien Laboratory
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Lévesque, Daniel. "Indices visuels de profondeur liés à la diffusion de la lumière." Mémoire, Université de Sherbrooke, 2005. http://savoirs.usherbrooke.ca/handle/11143/4651.

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Le phénomène de la diffusion de la lumière par les particules du milieu dans lequel elle se propage révèle des indices visuels nous permettant de déduire certains renseignements relatifs à la scène observée. En se basant sur un modèle de diffusion simple de la lumière, ce mémoire explore les rares travaux qui ont déjà été accomplis dans ce domaine et propose une méthode novatrice permettant de déduire la structure tridimensionnelle d’une scène à partir de deux images captées dans des conditions de visibilité différentes. Nous présentons de plus, deux nouvelles méthodes servant à repérer les contours d’occultation à partir de ces mêmes images. L’originalité des méthodes proposées repose sur une approche basée sur l’étude des contrastes, en particulier comment ceux-ci sont affectés par un changement des conditions de visibilité, tandis que les méthodes existantes utilisent plutôt les intensités. À l’aide d’images de scènes synthétiques et de scènes réelles, nous produisons des résultats expérimentaux validant nos travaux. En outre, les conditions dans lesquelles les méthodes proposées s’appliquent sont balisées à l’aide d’études d’influence des paramètres et du bruit.
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Ebrahimi, Shahin. "Contribution to automatic adjustments of vertebrae landmarks on x-ray images for 3D reconstruction and quantification of clinical indices." Thesis, Paris, ENSAM, 2017. http://www.theses.fr/2017ENAM0050/document.

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L’exploitation de données radiographiques, en particulier pour la reconstruction 3D du rachis de patients scoliotiques, est un prérequis à la modélisation personnalisée. Les méthodes actuelles, bien qu’assez robustes pour la routine clinique, reposent sur des ajustements manuels fastidieux. Dans ce contexte, ce travail de thèse vise à la détection automatisée de points anatomiques spécifiques des vertèbres, permettant ainsi des ajustements automatisés. Nous avons développé premièrement une méthode originale de localisation de coins de vertèbres cervicales et lombaires sur les radiographies sagittales. L’évaluation rigoureuse de cette méthode suggère sa robustesse et sa précision. Nous avons ensuite développé un algorithme pour le problème pertinent cliniquement de localisation des pédicules sur les radiographies coronales. Cet algorithme se compare favorablement aux méthodes similaires dans la littérature, qui nécessitent une saisie manuelle. Enfin, nous avons soulevé les problèmes, relativement peu étudiés, de détection, identification et segmentation des apophyses épineuses du rachis cervical dans les radiographies sagittales. Toutes les tâches mentionnées ont été réalisées grâce à une combinaison originale de descripteurs visuels et une classification multi-classe par Random Forest, menant à une nouvelle et puissante approche de localisation et de segmentation. Les méthodes proposées dans cette thèse suggèrent un grand potentiel pour être intégré à la reconstruction 3D du rachis, utilisée quotidiennement en routine clinique
Exploitation of spine radiographs, in particular for 3D spine shape reconstruction of scoliotic patients, is a prerequisite for personalized modelling. Current methods, even though robust enough to be used in clinical routine, still rely on tedious manual adjustments. In this context, this PhD thesis aims toward automated detection of specific vertebrae landmarks in spine radiographs, enabling automated adjustments. In the first part, we developed an original Random Forest based framework for vertebrae corner localization that was applied on sagittal radiographs of both cervical and lumbar spine regions. A rigorous evaluation of the method confirms robustness and high accuracy of the proposed method. In the second part, we developed an algorithm for the clinically-important task of pedicle localization in the thoracolumbar region on frontal radiographs. The proposed algorithm compares favourably to similar methods from the literature while relying on less manual supervision. The last part of this PhD tackled the scarcely-studied task of joint detection, identification and segmentation of spinous processes of cervical vertebrae in sagittal radiographs, with again high precision performance. All three algorithmic solutions were designed around a generic framework exploiting dedicated visual feature descriptors and multi-class Random Forest classifiers, proposing a novel solution with computational and manual supervision burdens aiming for translation into clinical use. Overall, the presented frameworks suggest a great potential of being integrated in current spine 3D reconstruction frameworks that are used in daily clinical routine
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Folio, David. "Stratégies de commande référencées multi-capteurs et gestion de la perte du signal visuel pour la navigation d'un robot mobile." Phd thesis, Université Paul Sabatier - Toulouse III, 2007. http://tel.archives-ouvertes.fr/tel-00172507.

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La synthèse de lois de commande efficaces apparaît comme un enjeu important dans la réalisation autonome de tâches de navigation robotiques. Ce problème peut être abordé par différentes approches. L'une d'entre elles, la commande référencée capteur, permet de définir les boucles de commande directement à partir des mesures sensorielles au lieu de les exprimer en fonction de l'état du robot. Dans ce contexte, du fait de la richesse du signal vidéo, la vision apparaît comme un capteur privilégié pour la réalisation de tâches très variées de manière précise. Cependant, la commande référencée vision reposant sur la seule régulation des indices visuels dans l'image s'avère mal adaptée pour réaliser des tâches de navigation complexes dans des environnements encombrés d'obstacles. En effet, dans ce cas, il est nécessaire de garantir d'une part la sécurité du robot, et d'autre part la disponibilité permanente des indices visuels dans l'image. Ce sont précisément ces problèmes que nous avons voulu étudier dans le cadre de cette thèse. Notre contribution a consisté à définir des stratégies de commande référencées multi-capteurs pour un robot mobile réalisant une tâche référencée vision dans un environnement encombré d'obstacles susceptibles d'occulter le motif visuel. Nous avons tout d'abord proposé des lois de commandes permettant d'éviter à la fois les occultations et les collisions. Toutefois, les résultats obtenus ont montré que chercher à éviter simultanément ces deux phénomènes surcontraignait le mouvement du robot, limitant la gamme des missions réalisables. Nous avons alors développé une seconde approche consistant à tolérer temporairement la perte du signal visuel. Celle-ci repose sur l'exploitation de la réversibilité du lien vision/mouvement exprimé par le torseur d'interaction. Nous avons ainsi proposé dans un cadre général plusieurs méthodes (analytiques et numériques) de reconstruction du signal visuel lorsqu'il devient indisponible. Nous avons ensuite validé ch acune de ces méthodes dans le cas de la réalisation d'une tâche de navigation référencée vision dans un milieu encombré d'obstacles. Nous avons également montré l'intérêt de nos approches lorsque la caméra présente un défaut de fonctionnement pendant l'exécution d'une mission.
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Hussain, Sabit ul. "Machine Learning Methods for Visual Object Detection." Thesis, Grenoble, 2011. http://www.theses.fr/2011GRENM070/document.

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Le but de cette thèse est de développer des méthodes pratiques plus performantes pour la détection d'instances de classes d'objets de la vie quotidienne dans les images. Nous présentons une famille de détecteurs qui incorporent trois types d'indices visuelles performantes – histogrammes de gradients orientés (Histograms of Oriented Gradients, HOG), motifs locaux binaires (Local Binary Patterns, LBP) et motifs locaux ternaires (Local Ternary Patterns, LTP) – dans des méthodes de discrimination efficaces de type machine à vecteur de support latent (Latent SVM), sous deux régimes de réduction de dimension – moindres carrées partielles (Partial Least Squares, PLS) et sélection de variables par élagage de poids SVM (SVM Weight Truncation). Sur plusieurs jeux de données importantes, notamment ceux du PASCAL VOC2006 et VOC2007, INRIA Person et ETH Zurich, nous démontrons que nos méthodes améliorent l'état de l'art du domaine. Nos contributions principales sont : – Nous étudions l'indice visuelle LTP pour la détection d'objets. Nous démontrons que sa performance est globalement mieux que celle des indices bien établies HOG et LBP parce qu'elle permet d'encoder à la fois la texture locale de l'objet et sa forme globale, tout en étant résistante aux variations d'éclairage. Grâce à ces atouts, LTP fonctionne aussi bien pour les classes qui sont caractérisées principalement par leurs structures que pour celles qui sont caractérisées par leurs textures. En plus, nous démontrons que les indices HOG, LBP et LTP sont bien complémentaires, de sorte qu'un jeux d'indices étendu qui intègre tous les trois améliore encore la performance. – Les jeux d'indices visuelles performantes étant de dimension assez élevée, nous proposons deux méthodes de réduction de dimension afin d'améliorer leur vitesse et réduire leur utilisation de mémoire. La première, basée sur la projection moindres carrés partielles, diminue significativement le temps de formation des détecteurs linéaires, sans réduction de précision ni perte de vitesse d'exécution. La seconde, fondée sur la sélection de variables par l'élagage des poids du SVM, nous permet de réduire le nombre d'indices actives par un ordre de grandeur avec une réduction minime, voire même une petite augmentation, de la précision du détecteur. Malgré sa simplicité, cette méthode de sélection de variables surpasse toutes les autres approches que nous avons mis à l'essai. – Enfin, nous décrivons notre travail en cours sur une nouvelle variété d'indice visuelle – les « motifs locaux quantifiées » (Local Quantized Patterns, LQP). LQP généralise les indices existantes LBP / LTP en introduisant une étape de quantification vectorielle – ce qui permet une souplesse et une puissance analogue aux celles des approches de reconnaissance visuelle « sac de mots », qui sont basées sur la quantification des régions locales d'image considérablement plus grandes – sans perdre la simplicité et la rapidité qui caractérisent les approches motifs locales actuelles parce que les résultats de la quantification puissent être pré-compilés et stockés dans un tableau. LQP permet une augmentation considérable de la taille du support local de l'indice, et donc de sa puissance discriminatoire. Nos expériences indiquent qu'elle a la meilleure performance de toutes les indices visuelles testés, y compris HOG, LBP et LTP
The goal of this thesis is to develop better practical methods for detecting common object classes in real world images. We present a family of object detectors that combine Histogram of Oriented Gradient (HOG), Local Binary Pattern (LBP) and Local Ternary Pattern (LTP) features with efficient Latent SVM classifiers and effective dimensionality reduction and sparsification schemes to give state-of-the-art performance on several important datasets including PASCAL VOC2006 and VOC2007, INRIA Person and ETHZ. The three main contributions are as follows. Firstly, we pioneer the use of Local Ternary Pattern features for object detection, showing that LTP gives better overall performance than HOG and LBP, because it captures both rich local texture and object shape information while being resistant to variations in lighting conditions. It thus works well both for classes that are recognized mainly by their structure and ones that are recognized mainly by their textures. We also show that HOG, LBP and LTP complement one another, so that an extended feature set that incorporates all three of them gives further improvements in performance. Secondly, in order to tackle the speed and memory usage problems associated with high-dimensional modern feature sets, we propose two effective dimensionality reduction techniques. The first, feature projection using Partial Least Squares, allows detectors to be trained more rapidly with negligible loss of accuracy and no loss of run time speed for linear detectors. The second, feature selection using SVM weight truncation, allows active feature sets to be reduced in size by almost an order of magnitude with little or no loss, and often a small gain, in detector accuracy. Despite its simplicity, this feature selection scheme outperforms all of the other sparsity enforcing methods that we have tested. Lastly, we describe work in progress on Local Quantized Patterns (LQP), a generalized form of local pattern features that uses lookup table based vector quantization to provide local pattern style pixel neighbourhood codings that have the speed of LBP/LTP and some of the flexibility and power of traditional visual word representations. Our experiments show that LQP outperforms all of the other feature sets tested including HOG, LBP and LTP
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Ghazali, Naqibah Binti. "An investigation of visual field asymmetry indices for detecting early Primary Open Angle Glaucoma." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/an-investigation-of-visual-field-asymmetry-indices-for-detecting-early-primary-open-angle-glaucoma(728f2ecb-2476-4849-bce5-4d10e5848cdb).html.

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Glaucoma can be defined as group of optic neuropathies associated with structural changes to the optic nerve head and the presence of irreversible visual field loss that may derive from various pathological mechanisms. One of the commonest types of glaucoma is primary open angle glaucoma (POAG). Evaluation of the visual field is an essential component in the diagnosis and management of glaucoma. Visual field loss in POAG is often asymmetric both within and between eyes. This thesis extracts samples from a large database of visual field records collected at Manchester Royal Eye Hospital to measure the discriminatory power of various asymmetry indices in the detection of POAG.The first investigation describes and evaluates 3 new Sup/Inf hemifield asymmetry indices; hemifield mean difference, hemifield standard deviation and the number of asymmetric test pairs, for detecting POAG and compares the performance of these new indices with the well-established Glaucoma Hemifield Test (GHT). A good performance was observed for the new indices. GHT can fail to detect significant asymmetry, detected by hemifield standard deviation and number of asymmetric test pairs, when an early defect crosses the GHT sector boundaries. The second investigation looked at the performance of R/L asymmetry indices and whether these indices are superior to the previously investigated Sup/Inf hemifield indices. This study found that, the new R/L asymmetry indices did not perform better than worse eye uniocular hemifield asymmetry indices in differentiating between normal and POAG eyes. Their performance was similar to that of combined uniocular indices. The third investigation describes and measures the discriminatory power of 2 indices that quantify the clustering of Sup/Inf hemifield asymmetric test locations. The final experimental chapter determines the discriminatory power of a multi- factorial model that combines a range of asymmetry indices. In a sample selected to critically evaluate early functional loss the model correctly classified 89% of controls and 80% of POAG cases and performed better than GHT and single asymmetry analyses.
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Gothwal, Vijaya Kumari. "Functional vision performance in Indian school-going children with visual impairment." Queensland University of Technology, 2007. http://eprints.qut.edu.au/16659/.

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Functional vision refers to the use of vision to perform day-day tasks and is assessed by the ability to perform these tasks. Assessment of functional vision is an integral component of the management of children with visual impairment. The results of the assessment help in designing appropriate educational and rehabilitation intervention strategies. The L V Prasad-Functional Vision Questionnaire (LVP-FVQ) is a reliable and valid tool for assessing self-reported functional vision performance (FVP) in children. Self-reports are obviously the child's perception of his or her ability to perform certain tasks but they may not reflect actual performance. Various studies of FVP in adults have used actual performance measures of everyday tasks, but very few studies, even in adults with visual impairment, have compared self-reports and performance measures and none have included identical tasks on the 2 methods of assessment. To date, no study has assessed FVP using performance measures of daily tasks in the paediatric population. Therefore, the aims of the current study were: (1) To develop performance measures of FVP and compare them with self-reports of FVP from the LVP-FVQ in a prospective cohort of Indian school-going children with visual impairment. (2) To investigate the effect of a psychological attribute, self-concept, on self-reports, performance measures and the relationships between the 2 measures. (3) To investigate the relationship between clinical measures of vision and FVP. Performance measures of FVP for children with visual impairment were developed for 17 day to day tasks for comparison with self-reports of the same tasks for the LVP-FVQ. The LVP-FVQ was verbally administered by the researcher to 178 Indian school-going children aged between 8 and 17 years with visual impairment. Similarly, the performance of each of the tasks by these children was measured by the researcher. The performance measures for most of these tasks were recorded on continuous scales and later categorized to match the ordinal ratings from the LVP-FVQ. The self-report and performance measure ratings for the 17 tasks were then converted into the same metric using a Rasch model allowing an accurate picture of whether and how these two measures of FVP compared with each other. Rasch analysis was used to estimate the person ability and item difficulty for FVP from the 2 methods of assessment. Self-reports showed stronger correlations with performance measures of FVP than were hypothesized. Similar to some studies in adults, binocular high-contrast visual acuity was found to be the single most significant predictor of a child's functional vision performance. Contrary to expectations, self-concept did not have a significant effect on the relationship between the 2 measures. A few reasons for the stronger than expected relationship between the 2 methods of assessment of FVP in children with visual impairment are suggested. Firstly, the use of identical tasks for self-reports and performance measures of FVP is likely to improve the relationship. Secondly, the LVP-FVQ was developed using focus groups of children with visual impairment, their parents, low vision specialists and rehabilitation professionals leading to good content validity. Since children were included in the development of the LVP-FVQ, the tasks were representative of a child's typical daily life. Thus, the performance measures were also suited to the day-day tasks of school-going children but were not tapping any social and psychological issues relating to visual impairment. Thirdly, the use of Rasch analysis which addresses many of the issues of unequal measurement and defines a hierarchy of items for self-reports and performance measures could have led to higher correlations in the present study. Finally, the high reliability and validity of self-reports and performance measures of FVP in the present study may have contributed to the higher than expected correlations. None of the demographic variables or self-concept affected the relationship between self-reports and performance measures of FVP, but self-concept had a weak significant association with self-reports. This result is unique to this study and warrants further investigation. Binocular high-contrast visual acuity alone, the most common visual function measured in ophthalmic clinics, explained between one-third and two-thirds of the variance in functional vision performance. This confirms the expected trend that with worse visual impairment, FVP is lower. The addition of the variable, self-concept, resulted in a very small increase in the variability explained for self-reported FVP. Similarly, the addition of other clinical measures of vision such as binocular low contrast visual acuity and colour vision resulted in a small increase in the variability explained for performance measures of FVP. The correlation between binocular high-contrast visual acuity and performance measures of FVP was statistically significantly higher than that between binocular high-contrast visual acuity and self-reports of FVP. There are a few possible reasons for this higher correlation. Firstly, performance measures are considered to be a more "objective" form of assessment, while self-reports are a child's perception of his or her ability and therefore lack a context, which may result in either over-estimation or under-estimation of actual ability. Furthermore, performance measures include dimensions such as the time taken to perform a task or other criteria specific to a task, while self-reports do not use such qualifiers. Secondly, the higher correlation may be the result of the visual complexity of some of the tasks. While self-concepts of children with visual impairment played a small but significant role in the self-reported FVP, studies in adults with visual impairment have suggested that other psychological factors such as mood, anxiety, motivation etc. are associated with an individual's perception of visual performance. Future studies are required to explore the possible role of these and other factors in FVP in Indian school-going children with visual impairment. This thesis makes a significant contribution to the field of paediatric low vision rehabilitation by providing performance measures of FVP and relating them to self-reports in children with visual impairment and their relationship with common measures of visual function. With self-reports, the child is reporting his or her perception of ability to complete a task, where performance measures examine the child's ability to complete a task by observing his or her performance. Thus, although the two methods are comparable, it is because of the different yields from each of these measures that they are not considered interchangeable. A combination of the 2 measures where practical would perhaps provide a richer depiction of the FVP of children with visual impairment. As developing countries such as India have limited resources allocated for eye care services where less than seven percent of the gross national product is spent on health care, self-reports can be utilized together with clinical measures of vision (mainly visual acuity) to assess the FVP in children with visual impairment in a community setting. However, both methods of assessment of FVP together with clinical measures of vision are essential if a comprehensive assessment of FVP is to be carried out in children with visual impairment. Information from these assessments can help clinicians better understand the functioning of children with visual impairment and incorporate them in the management of low vision in school-going children with visual impairment in India.
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Sailoganathan, Ananth. "Design, construction & validation of new Indian language visual acuity charts." Thesis, Anglia Ruskin University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408883.

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Books on the topic "Indice visuel"

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In the forest: Visual and material worlds of Andamanese history (1858-2006). Lanham, Md: University Press of America, 2009.

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1940-, Singh Chandramani, and Javāhara Kalā Kendra, eds. Visual music: Ragamala paintings of Rajasthan. Jaipur: Jawahar Kala Kendra, 2005.

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Tantric visual culture: A cognitive approach. London: Routledge, Taylor & Francis Group, 2015.

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Articulations: Voices from contemporary Indian visual art. New Delhi: Rupa & Co., 2004.

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Sciannameo, Gianluca. Nelle Indie di quaggiù: Ernesto De Martino e il cinema etnografico. Bari: Palomar, 2006.

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Ribeiro, Berta G. Arte indígena, linguagem visual. Belo Horizonte: Editora Itatiaia, 1989.

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Ribeiro, Berta G. Arte indígena, linguagem visual. Belo Horizonte: Editora Itatiaia, 1989.

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Returning ...: An Indian odyssey. Varanasi: Pilgrims Pub., 2006.

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Ray, Pranabranjan. Freedom, what it means to me: An exhibition of visual objects. Kolkata: Aakriti Art Gallery, 2007.

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Canda, Debāśisa. Visual rhapsody: An international painting exhibition, Kolkata, New Delhi, Hong Kong, 2008. New Delhi: Aryan Art Gallery, 2008.

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Book chapters on the topic "Indice visuel"

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Sampaolesi, Roberto, Juan Roberto Sampaolesi, and Jorge Zárate. "Program for Glaucoma: G1 Visual Indices." In The Glaucomas, 561–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-35500-4_37.

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Maitra Bajpai, Lopamudra. "Visual Storytelling." In India, Sri Lanka and the SAARC Region, 110–13. 1 Edition. | New York : Taylor & Francis Group, 2020.: Routledge India, 2020. http://dx.doi.org/10.4324/9780429320514-23.

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Mikelberg, F. S., S. M. Drance, M. Schulzer, and K. Wijsman. "The effect of miosis on visual field indices." In Seventh International Visual Field Symposium, Amsterdam, September 1986, 645–49. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3325-5_84.

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Augustiny, Lotti, and Josef Flammer. "The Influence of Artificially Induced Visual Field Defects on the Visual Field Indices." In Documenta Ophthalmologica Proceedings Series, 55–67. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5512-7_8.

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Van Den Berg, T. J. T. P., and R. J. Nooteboom. "Behaviour of visual field indices with a gradient adaptive method." In Seventh International Visual Field Symposium, Amsterdam, September 1986, 201–6. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3325-5_27.

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Girdhar, Rohit, Jayaguru Panda, and C. V. Jawahar. "Mobile Visual Search for Digital Heritage Applications." In Digital Hampi: Preserving Indian Cultural Heritage, 317–36. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-5738-0_19.

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Reddy, Vanita. "Diasporic visual cultures of indian fashion and beauty." In Routledge Handbook of the Indian Diaspora, 183–99. Abingdon, Oxon; New York, NY: Routledge, 2018.: Routledge, 2017. http://dx.doi.org/10.4324/9781315672571-15.

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Mangun, George R. "Human Visual Evoked Potentials: Induced Rhythms or Separable Components?" In Induced Rhythms in the Brain, 217–31. Boston, MA: Birkhäuser Boston, 1992. http://dx.doi.org/10.1007/978-1-4757-1281-0_12.

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Albright, Thomas D. "Neuroscienze per l’architettura." In La mente in architettura, 193–211. Florence: Firenze University Press, 2021. http://dx.doi.org/10.36253/978-88-5518-286-7.12.

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Discusses the Indian design treatise the Vaastu Veda in relation to visual neuroscience. Relates visual perception in architecture to functional organisation of the brain. Relates Hubel and Weisel’s orientation sensitivity to the sense of order and pleasure imparted by the regularity of colonnades and cable stay bridges. Suggests aspects of perception facilitated by neuronal architecture and the dynamic between familiarity and novelty, plasticity and visual attunement.
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Lau, Lisa. "Positioning Indian Women’s Writing in English (IWWE)." In Indian Writing in English and Issues of Visual Representation, 27–53. London: Palgrave Macmillan UK, 2015. http://dx.doi.org/10.1057/9781137474223_2.

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Conference papers on the topic "Indice visuel"

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Basu, Abhishek, Tirtha Sankar Das, Subir Kumar Sarkar, Abhik Roy, and Nurul Islam. "FPGA prototype of visual information hiding." In 2010 Annual IEEE India Conference (INDICON). IEEE, 2010. http://dx.doi.org/10.1109/indcon.2010.5712592.

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Meghrajani, Yogesh K., and Himanshu S. Mazumdar. "Hiding secret message using visual cryptography in steganography." In 2015 Annual IEEE India Conference (INDICON). IEEE, 2015. http://dx.doi.org/10.1109/indicon.2015.7443677.

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Bhat, Nagaraj N. "Real time robust hand gesture recognition and visual servoing." In 2012 Annual IEEE India Conference (INDICON). IEEE, 2012. http://dx.doi.org/10.1109/indcon.2012.6420791.

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Mohith, S. Shiv, S. Vijay, Sanjana V, and Niranjana Krupa. "Visual World to an Audible Experience: Visual Assistance for the Blind And Visually Impaired." In 2020 IEEE 17th India Council International Conference (INDICON). IEEE, 2020. http://dx.doi.org/10.1109/indicon49873.2020.9342481.

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Tomar, Khushboo, Sunil Kumar, and Krippy Kakkar. "Receiving of string and hex data serially using Visual C#." In 2015 Annual IEEE India Conference (INDICON). IEEE, 2015. http://dx.doi.org/10.1109/indicon.2015.7443364.

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Haritosh, Ankur, Chetan Ralekar, Taranjit Kaur, and Tapan Kumar Gandhi. "Human Visual Learning Inspired Effective Training Methods." In 2019 IEEE 16th India Council International Conference (INDICON). IEEE, 2019. http://dx.doi.org/10.1109/indicon47234.2019.9029047.

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Pai, Anuradha V., Jayesh Bellare, and Tapan K. Gandhi. "Chemoretina: An alternate approach to retinal prosthesis: Visual stimulation strategy using chemicals." In 2016 IEEE Annual India Conference (INDICON). IEEE, 2016. http://dx.doi.org/10.1109/indicon.2016.7839036.

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VenkataSwamy, M., Hrushikesha Mohanty, and Srini Ramaswamy. "VSM: A visual tool for the design and deployment of security requirements." In 2011 Annual IEEE India Conference (INDICON). IEEE, 2011. http://dx.doi.org/10.1109/indcon.2011.6139347.

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Varpe, Amarsinh B., Prashant L. Borde, Ramesh R. Manza, and Pravin L. Yannawar. "Automatic isolation of region of interest for multi-pose Audio Visual Speech Recognition." In 2014 Annual IEEE India Conference (INDICON). IEEE, 2014. http://dx.doi.org/10.1109/indicon.2014.7030536.

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Ambati, Rahul, and Chakravardhan Reddy Dudyala. "A Sequence-to-Sequence Model Approach for ImageCLEF 2018 Medical Domain Visual Question Answering." In 2018 15th IEEE India Council International Conference (INDICON). IEEE, 2018. http://dx.doi.org/10.1109/indicon45594.2018.8987108.

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Reports on the topic "Indice visuel"

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Warner, Harold D. Flight Simulator-Induced Sickness and Visual Displays Evaluation. Fort Belvoir, VA: Defense Technical Information Center, May 1993. http://dx.doi.org/10.21236/ada267019.

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Shinohara, Kazumitsu, and Toshiaki Miura. Sustained Distraction Effect on Visual Search Task Induced by Task Switching. Warrendale, PA: SAE International, May 2005. http://dx.doi.org/10.4271/2005-08-0049.

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Russell, Sheldon M., Gregory J. Funke, John M. Flach, Scott N. Watamaniuk, Adam J. Strang, Brent T. Miller, Allen Dukes, Lauren Menke, and Rebecca Brown. Alternative Indices of Performance: An Exploration of Eye Gaze Metrics in a Visual Puzzle Task. Fort Belvoir, VA: Defense Technical Information Center, July 2014. http://dx.doi.org/10.21236/ada610325.

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Kardon, Randy. Treatment of Laser-Induced Retinal Injury and Visual Loss Using Sustained Release of Intra-Vitreal Neurotrophic Growth Factors. Addendum. Fort Belvoir, VA: Defense Technical Information Center, November 2011. http://dx.doi.org/10.21236/ada558524.

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Araujo, G. A., T. A. Quintero, Andrés Miguel Quintero Gutiérrez, and Medardo José Rodríguez Polo. Medición de la condición corporal del ganado Cebú. Universidad Nacional Abierta y a Distancia, December 2020. http://dx.doi.org/10.22490/ecapma.3672.

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Contextualización del Tema: Se define la condición corporal como la cantidad de grasa que cubre la vaca, que indica las reservas de energía útil que dispone para hacer frente a las altas demandas que impone la producción de leche y se puntualizan las ventajas que tiene este indicador sobre el peso vivo, el perímetro torácico y otros estimadores de las reservas corporales. Vacío de Investigación: En la ganadería de ganado Cebú del trópico colombiano especialmente en la región caribe, se ha arraigado la técnica de la observación visual, sin tener conocimiento de los indicadores de la condición corporal, y por lo tanto se requiere promover el uso de la calificación de la condición corporal como herramienta de campo en la toma de decisiones en el manejo nutricional de la vaca. Propósito de Working paper: Es socializar el conocimiento que viene realizando el semillero de investigación acordes con las salidas de campo, aludiendo al tipo de estrategias didácticas que implican la aplicación de conceptos, teorías y postulados para construcción de nuevo conocimiento. Metodología seguida en el estudio: Se brinda una metodología para ganado cebú con 5 categorías de puntaje, aplicando la guía para la evaluación de la condición corporal de vacas en sistemas doble propósito, con la siguiente escala: 1 muy pobre, 2 pobre, 3 regular, 4 buena, 5 muy buena y 6 obesa. Resultados Obtenidos Evidenciamos que la gran mayoría de la vacas presentan una condición corporal entre 3 y 4, la cual se puede considerar de regular a buena, reflejando que tienen poca producción de leche, presentan un gran número de días abiertos y una baja condición corporal al final de la lactancia. Conclusiones: Se evidencio la estrecha relación entre valores de la condición corporal con el plano nutricional, la incorporación a la producción, valores de condición corporal de 2.5 a 3.5 si se desean alcanzar niveles productivos y reproductivos adecuados.
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