A study on the pedestrian and cyclist recognition based on the backpropagation(BP) neural network is presented in this paper.The binary image of moving object contour is processed by the method presented here.The method first draws four features from the binary image and forms the feature vector as the input of BP neural network.The output of BP neural network is the recognition of pedestrians and cyclists.Secondly,the structure of BP neural network is designed.In order to obtain the reasonable number of th...