A partir d’une réflexion plastique, cette recherche vise à étudier les liens entre la répétition et l’art vidéo. La répétition, pensée en termes de processus, s’inscrit dans une double perspective. Elle est d’abord un principe de composition qui génère un certain nombre d’effets. Elle est ensuite un motif capable d’interroger une série de glissements perceptifs susceptibles d’interroger notre travail psychique actuel. Une première partie, consacrée à la mise en boucle de l’image et du son et à la boucle du direct, vise à étudier comment la diversité des processus de répétition à l’oeuvre dans l’art vidéo peut orchestrer de façon singulière la perception des objets temporels. Une seconde partie permettra d’étudier comment les processus de répétition opèrent lorsqu’ils prennent place dans des vidéos qui intègrent une dimension narrative. La circularité des récits, les jeux de dédoublements et de redoublements, les allers-retours entre textes et images agissent comme autant de ritournelles qui décousent l’unité des personnages et de leurs récits pour tenter de cerner un sujet aujourd’hui caractérisé par son indétermination. / Starting with a reflection based on plastic arts, this thesis aims at studying the links between repetition and video art. Repetition, considered as a process, is double. First, it is a composition principle which produces several effects. Secondly, it is a motif capable of interrogating a series of perception shifts likely to question our current psychic work. The aim of the first part, devoted to sound and image in a continuous loop and to feedback processes, is to study how the many processes of repetition at work in video art can orchestrate our perception of temporal objects. The second part will focus on the way these processes of repetition operate when they take place in videos with a narrative dimension. The narratives’ circularity, the processes of doubling and reduplication, the back and forth movement between texts and images act as ritournelles which undo the characters and their stories’ unity to try and comprehend a subject whose profound nature is today indeterminate.

The main purpose of thesis is creation and evaluation of models for change detection of arable land to grassland by Hybrid-based Change Detection method, which combined approaches based on the Vegetation Indices, Image Differencing and Principal Component Analysis. Six locations with different seasonal configuration of images with high resolution and one locality covered by image with very high resolution were used. The areas were spread across the foothill areas of the Czech Republic. The selection of predictors and the most suitable model was supported by statistical calculation. Application selected models were carried out using a multi-temporal object classification and their accuracy were verified using reference data. The benefit of this thesis is finding generally applicable model useful to investigate the land cover change and evaluation of the potentially most appropriate seasonal configuration of images. Valuable is also methodology in this thesis which focus on selection of predictors and calculation the order of the most appropriate models, which is unique in the available literature. The thesis provides useful findings fitting to insufficiently explored issue of Change Detection arable land to grassland. Powered by TCPDF (www.tcpdf.org)