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Theses

SLAM and data fusion for autonomous vehicles : from classical approaches to deep learning methods

Abstract : Self-driving cars have the potential to provoke a mobility transformation that will impact our everyday lives. They offer a novel mobility system that could provide more road safety, efficiency and accessibility to the users. In order to reach this goal, the vehicles need to perform autonomously three main tasks: perception, planning and control. When it comes to urban environments, perception becomes a challenging task that needs to be reliable for the safety of the driver and the others. It is extremely important to have a good understanding of the environment and its obstacles, along with a precise localization, so that the other tasks are well performed. This thesis explores from classical approaches to Deep Learning techniques to perform mapping and localization for autonomous vehicles in urban environments. We focus on vehicles equipped with low-cost sensors with the goal to maintain a reasonable price for the future autonomous vehicles. Considering this, we use in the proposed methods sensors such as 2D laser scanners, cameras and standard IMUs. In the first part, we introduce model-based methods using evidential occupancy grid maps. First, we present an approach to perform sensor fusion between a stereo camera and a 2D laser scanner to improve the perception of the environment. Moreover, we add an extra layer to the grid maps to set states to the detected obstacles. This state allows to track an obstacle overtime and to determine if it is static or dynamic. Sequentially, we propose a localization system that uses this new layer along with classic image registration techniques to localize the vehicle while simultaneously creating the map of the environment. In the second part, we focus on the use of Deep Learning techniques for the localization problem. First, we introduce a learning-based algorithm to provide odometry estimation using only 2D laser scanner data. This method shows the potential of neural networks to analyse this type of data for the estimation of the vehicle's displacement. Sequentially, we extend the previous method by fusing the 2D laser scanner with a camera in an end-to-end learning system. The addition of camera images increases the accuracy of the odometry estimation and proves that we can perform sensor fusion without any sensor modelling using neural networks. Finally, we present a new hybrid algorithm to perform the localization of a vehicle inside a previous mapped region. This algorithm takes the advantages of the use of evidential maps in dynamic environments along with the ability of neural networks to process images. The results obtained in this thesis allowed us to better understand the challenges of vehicles equipped with low-cost sensors in dynamic environments. By adapting our methods for these sensors and performing the fusion of their information, we improved the general perception of the environment along with the localization of the vehicle. Moreover, our approaches allowed a possible comparison between the advantages and disadvantages of learning-based techniques compared to model-based ones. Finally, we proposed a form of combining these two types of approaches in a hybrid system that led to a more robust solution.
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https://pastel.archives-ouvertes.fr/tel-03167034
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  • HAL Id : tel-03167034, version 1

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Michelle Andrade Valente da Silva. SLAM and data fusion for autonomous vehicles : from classical approaches to deep learning methods. Machine Learning [cs.LG]. Université Paris sciences et lettres, 2019. English. ⟨NNT : 2019PSLEM079⟩. ⟨tel-03167034⟩

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