This Ph.D. thesis is the result of my research work in the machine learning (particularly in Deep Learning), image processing and intelligent transportation fields for solving the problem of multi-task pedestrian protection system (PPS) including not only pedestrian classification, detection and tracking, but also pedestrian action-unit classification and prediction, and finally pedestrian risk estimation.The goal of our research work is to develop an intelligent pedestrian protection component based only on single stereo vision system using an optimal cross-modality deep learning architecture in order to to classify the current pedestrian action, predict their next actions and finally to estimate the pedestrian risk by the time to cross f...