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You searched for subject:(visual concealment). Showing records 1 – 2 of 2 total matches.

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University of Waterloo

1. Malcolmson, Kelly. Towards a Theory of Visual Concealment.

Degree: 2010, University of Waterloo

The goal of this dissertation is to take initial steps towards understanding concealment behaviour and ultimately developing a theory of visual concealment. Since there are relatively few studies of concealment in the literature and given the natural relationship between search and concealment, five strategies used in the development of traditional visual search theory and scene-based search theory were applied to the study of concealment. These strategies are: 1) establish a methodology, 2) identify dimensions, 3) categorize dimensions, 4) prioritize dimensions, and 5) integrate results into a theoretical framework that may involve inferences about the mechanisms involved. In Chapter 2, participants placed target objects within luggage in locations that were easy or hard to find (i.e., the placement task). Participants’ subjective reports of their thought processes and strategies were analyzed to identify dimensions that are important during concealment in real-world settings. Once a list of dimensions was generated, the dimensions were then categorized into three categories: Stimulus Properties dimensions such as visual similarity, Embodiment dimensions such as confrontation, and Higher Order dimensions such as schema. In Chapter 3, the dimensions uncovered in Chapter 2 were used in a forced-choice task, and participants’ choices were evaluated to determine whether the dimensions affected hiding behaviour. To further develop the methodological techniques available to study concealment behaviour and to examine the generalizability of previous findings, in Chapter 4, the placement task was used in another context – an office environment – and the locations chosen by participants to make objects easy or hard to find were coded on relevant dimensions. In Chapter 5, an initial attempt was made to prioritize the dimensions. The forced-choice task was used in a new way to explore the relative importance of the dimensions by examining which dimensions participants chose to use over other dimensions. Finally in the General Discussion in Chapter 6, an attempt was made to integrate available results and previous theories and to make inferences about the mechanisms involved in visual concealment. Methodological considerations and future directions for the study of visual concealment are also discussed.

Subjects/Keywords: visual concealment; hiding; visual search

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

APA (6th Edition):

Malcolmson, K. (2010). Towards a Theory of Visual Concealment. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/5394

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):

Malcolmson, Kelly. “Towards a Theory of Visual Concealment.” 2010. Thesis, University of Waterloo. Accessed November 12, 2019. http://hdl.handle.net/10012/5394.

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

MLA Handbook (7th Edition):

Malcolmson, Kelly. “Towards a Theory of Visual Concealment.” 2010. Web. 12 Nov 2019.

Vancouver:

Malcolmson K. Towards a Theory of Visual Concealment. [Internet] [Thesis]. University of Waterloo; 2010. [cited 2019 Nov 12]. Available from: http://hdl.handle.net/10012/5394.

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

Council of Science Editors:

Malcolmson K. Towards a Theory of Visual Concealment. [Thesis]. University of Waterloo; 2010. Available from: http://hdl.handle.net/10012/5394

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


Université de Grenoble

2. Ekobo Akoa, Brice. Détection et conciliation d'erreurs intégrées dans un décodeur vidéo : utilisation des techniques d'analyse statistique : Error detection and concealment integrated in a video decoder : using technics of statistical analysis.

Degree: Docteur es, Nanoélectronique et nanotechnologie, 2014, Université de Grenoble

Ce manuscrit présente les travaux de recherche réalisés au cours de ma thèse, dont le but est de développer des algorithmes de correction d'erreurs dans un décodage numérique d'images et d'assurer un haut niveau de la qualité visuelle des images décodées. Nous avons utilisé des techniques d'analyse statistique pour détecter et dissimuler les artefacts. Une boucle de contrôle de la qualité est implémentée afin de surveiller et de corriger la qualité visuelle de l'image. Le manuscrit comprend six chapitres. Le premier chapitre présente les principales méthodes d'évaluation de la qualité des images trouvées dans l'état de l'art et introduit notre proposition. Cette proposition est en fait un outil de mesure de la qualité des vidéos (OMQV) qui utilise le système visuel humain pour indiquer la qualité visuelle d'une vidéo (ou d'une image). Trois modèles d'OMQV sont conçus. Ils sont basés sur la classification, les réseaux de neurones artificiels et la régression non linéaire, et sont développés dans le deuxième, troisième et quatrième chapitre respectivement. Le cinquièmechapitre présente quelques techniques de dissimulation d'artefacts présents dans l'état de l'art. Le sixième et dernier chapitre utilise les résultats des quatre premiers chapitres pour mettre au point un algorithme de correction d'erreurs dans les images. La démonstration considère uniquement les artefacts flou et bruit et s'appuie sur le filtre de Wiener, optimisé sur le critère du minimum linéaire local de l'erreur quadratique moyenne. Les résultats sont présentés et discutés afin de montrer comment l'OMQV améliore les performances de l'algorithme mis en œuvre pour la dissimulation des artefacts.

This report presents the research conducted during my PhD, which aims to develop an efficient algorithm for correcting errors in a digital image decoding process and ensure a high level of visual quality of decoded images. Statistical analysis techniques are studied to detect and conceal the artefacts. A control loop is implemented for the monitoring of image visual quality. The manuscript consists in six chapters. The first chapter presents the principal state of art image quality assessment methods and introduces our proposal. This proposal consists in a video quality measurement tool (VQMT) using the Human Visual System to indicate the visual quality of a video (or an image). Three statistical learning models of VQMT are designed. They are based on classification, artificial neural networks and non-linear regression and are developed in the second, third and fourth chapter respectively. The fifth chapter presents the principal state of art image error concealment technics. The latter chapter uses the results of the four former chapters to design an algorithm for error concealment in images. The demonstration considers blur and noise artefacts and is based on the Wiener filter optimized on the criterion of local linear minimum mean square error. The results are presented and discussed to show how the VQMT improves the performances of the implemented…

Advisors/Committee Members: Simeu, Emmanuel (thesis director), Lebowsky, Fritz (thesis director).

Subjects/Keywords: Qualité visuelle; Décodeur numérique; Image; Intelligence artificielle; Correction d’erreurs; Artefact de flou; Artefact de bruit; Analyse statistique; Statistical analysis; Visual quality; Digital decoder; Image; Artificial Intelligence; Error concealment; Blur artifact; Artifact noise; 620

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

APA (6th Edition):

Ekobo Akoa, B. (2014). Détection et conciliation d'erreurs intégrées dans un décodeur vidéo : utilisation des techniques d'analyse statistique : Error detection and concealment integrated in a video decoder : using technics of statistical analysis. (Doctoral Dissertation). Université de Grenoble. Retrieved from http://www.theses.fr/2014GRENT069

Chicago Manual of Style (16th Edition):

Ekobo Akoa, Brice. “Détection et conciliation d'erreurs intégrées dans un décodeur vidéo : utilisation des techniques d'analyse statistique : Error detection and concealment integrated in a video decoder : using technics of statistical analysis.” 2014. Doctoral Dissertation, Université de Grenoble. Accessed November 12, 2019. http://www.theses.fr/2014GRENT069.

MLA Handbook (7th Edition):

Ekobo Akoa, Brice. “Détection et conciliation d'erreurs intégrées dans un décodeur vidéo : utilisation des techniques d'analyse statistique : Error detection and concealment integrated in a video decoder : using technics of statistical analysis.” 2014. Web. 12 Nov 2019.

Vancouver:

Ekobo Akoa B. Détection et conciliation d'erreurs intégrées dans un décodeur vidéo : utilisation des techniques d'analyse statistique : Error detection and concealment integrated in a video decoder : using technics of statistical analysis. [Internet] [Doctoral dissertation]. Université de Grenoble; 2014. [cited 2019 Nov 12]. Available from: http://www.theses.fr/2014GRENT069.

Council of Science Editors:

Ekobo Akoa B. Détection et conciliation d'erreurs intégrées dans un décodeur vidéo : utilisation des techniques d'analyse statistique : Error detection and concealment integrated in a video decoder : using technics of statistical analysis. [Doctoral Dissertation]. Université de Grenoble; 2014. Available from: http://www.theses.fr/2014GRENT069

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