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Theses

Génération de séquences composées d'images de synthèse et d'images vidéo

Abstract : The visual impact assessment of architectural projects in urban environments is usually based on manual drawings, paintings on photographs, scale models or computer-generated images. These techniques are either too expensive or not realistic enough. Strictly using computer images means requiring an accurate 3D model of the environment. Computing such a model takes a long time and the results lack of visual accuracy. Our technique of overlaying computer generated images onto photographs of the environment is considerably more effective and reliable. This method is a promising solution regarding computation time (no accurate 3D model of the environment) as weIl as visual realism (provided by the photograph itself). Such a solution requires nevertheless to solve lots of problems in order to get geometrical and photometrical coherence in the resulting image. To this end, image analysis and image synthesis methods have to be designed and developed. The method is generalized to produce an animated film, and can furthermore greatly increase the realism of the simulation. My Ph.D. work was to test and integrate various image analysis and synthesis techniques for the composition of computer generated images with pictures or video film. This report explains the steps required for a realistic encrustation. For each of these steps, various techniques were tested in order to be able to choose the most suitable solutions according to the state of the most recent researches and to the applications we were dealing with (architectural and urban projects). The application of this work was the simulation of the Paris Bridges illumination projects. Concurrently to this work, I present a new method for the interpolation of computer images for the generation of a sequence of images. This method requires no approximation of the camera motion. Since video images are interlaced, sequences of computer images need to be interleaved too. The interpolation technique we propose is capable of doing this.
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Theses
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http://docnum.univ-lorraine.fr/prive/SCD_T_1996_0121_CHEVRIER.pdf
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https://hal.univ-lorraine.fr/tel-01747251
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Submitted on : Thursday, March 29, 2018 - 10:55:45 AM
Last modification on : Friday, February 26, 2021 - 3:26:01 PM

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  • HAL Id : tel-01747251, version 1

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Christine Chevrier. Génération de séquences composées d'images de synthèse et d'images vidéo. Autre [cs.OH]. Université Henri Poincaré - Nancy 1, 1996. Français. ⟨NNT : 1996NAN10121⟩. ⟨tel-01747251⟩

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