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Etude du rôle de la couleur dans la perception visuelle des scènes naturelles

Abstract : Color is an essential part of our daily visual experience and abounds in our representation of our environment. However, the mechanisms that make this information available and its usefulness for visual perception remain largely misunderstood and several hypotheses have been put forward on these topics. Color vision has been extensively studied using simple and artificial stimuli, but these results cannot be trivially generalized to more complex scenes, which require specific investigations. It is the main issue that has guided our approach for this thesis work.We focused on studying the mechanisms underlying the processing of color (or chrominance) information and exploring its role in the perception of complex and ecologically relevant stimuli such as natural scenes. To this end, we propose a theoretical analysis to quantify the statistical redundancy of luminance and chrominance information in natural scenes. We then describe a series of psychophysical experiments we have conducted and provide an information encoding and decision-making model to test different mechanistic hypotheses regarding the processing of chrominance information by the visual system. Finally, we highlight the role of color in a specific task: the classification of edges.All of these studies partly shed light on the complex processes involved in the processing of colour information by the visual system and propose methodological, computational and experimental tools for the study of these perceptual phenomena in natural scenes.
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Camille Breuil. Etude du rôle de la couleur dans la perception visuelle des scènes naturelles. Neurosciences. Université Grenoble Alpes, 2018. Français. ⟨NNT : 2018GREAS046⟩. ⟨tel-02628559⟩

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