I'm a PhD student working at ONERA (FRANCE). I'm supervised by Michel CRUCIANU (CNAM), Nicolas THOME (CNAM) and Stéphane HERBIN (ONERA). I'm working on problems that combine computer vision and natural language processing in artificial intelligence. More specifically, my thesis focuses on the development of autonomous visual systems which are able to make decisions and give some explanations about their actions through a comprehensive dialog written in natural language. This dialog shall depict the interactions and the role of the modules that analyse a visual scene or, more generally, visual data. This approach aims at giving a better explanation of the processing pipeline to ensure good performances of the system and to analyse its functioning.