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MuDeepNet: Unsupervised Learning of Dense Depth, Optical Flow and Camera Pose Using Multi-view Consistency Loss

Jun-Ning Zhang, Qun-Xing Su, Peng-Yuan Liu*, Hong-Yu Ge, and Ze-Feng Zhang
International Journal of Control, Automation, and Systems, vol. 17, no. 10, pp.2586-2596, 2019

Abstract : We take formulate structure from motion as a learning problem, and propose an end-to-end learning framework to calculate the image depth, optical flow, and the camera motion. This framework is composed of multiple encoder-ecoder networks. The key part of the network structure is the FlowNet, which can improve the accuracy of the estimated camera ego-motion and depth. As with recent studies, we use an end-to-end learning approach with multi-view synthesis as a variety of supervision, and proposes multi-view consistency losses to constrain both depth and camera ego-motion, requiring only monocular video sequences for training. Compared to the recently popular depth-estimation-networks using a single image, our network learns to use motion parallax correction depth. Although MuDeepNet training requires the use of two adjacent frames to obtain motion parallax, it is tested by using a single image. Thus, MuDeepNet is a monocular system. The experiments on KITTI dataset show our MuDeepNet outperforms other methods.

Keyword : Deep learning, depth consistency loss, depth estimation, optical flow, optical flow consistency loss, visual odometry (VO).

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