We revisit the problem of visual depth estimation in the context of autonomous vehicles. Despite the progress on monocular depth estimation in recent years, we show that the gap between monocular and stereo depth accuracy remains large---a particularly relevant result due to the prevalent reliance upon monocular cameras by vehicles that are expected to be self-driving. We argue that the challenges of removing this gap are significant, owing to fundamental limitations of monocular vision. As a result, we focus our efforts on depth estimation by stereo. We propose a novel semi-supervised learning approach to training a deep stereo neural network, along with a novel architecture containing a machine-learned argmax layer and a custom runtime (that will be shared publicly) that enables a smaller version of our stereo DNN to run on an embedded GPU. Competitive results are shown on the KITTI 2015 stereo dataset. We also evaluate the recent progress of stereo algorithms by measuring the impact upon accuracy of various design criteria.

在自动驾驶车辆的背景下，本文重新审视视觉深度估计问题。我们提出了一种新颖的半监督学习方法来训练深度立体神经网络，并提出了一种包含机器学习的argmax层和定制运行时的体系结构，可在嵌入式GPU上运行一个较小版本的我们的Stereo DNN。在KITTI 2015立体数据集上展示了有竞争力的结果。

立体视觉在深度精确测量中的重要性：一种有效的半监督深度神经网络方法