In this work we address the problem of finding reliable pixel-level
correspondences under difficult imaging conditions. We propose an approach
where a single convolutional neural network plays a dual role: It is
simultaneously a dense feature descriptor and a feature detector. By postponing
the detection to a later stage, the obtained keypoints are more stable than
their traditional counterparts based on early detection of low-level
structures. We show that this model can be trained using pixel correspondences
extracted from readily available large-scale SfM reconstructions, without any
further annotations. The proposed method obtains state-of-the-art performance
on both the difficult Aachen Day-Night localization dataset and the InLoc
indoor localization benchmark, as well as competitive performance on other
benchmarks for image matching and 3D reconstruction.

本文提出了一种使用卷积神经网络在像素级别取得可靠对应的方法，该模型可以同时作为密集特征描述符和特征检测器，并且在后期检测可以获得比传统低级结构的更稳定的关键点，从而实现了在无法获取更多注释信息的情况下训练该模型，该方法可以在难以定位的数据集（Aachen Day-Night localization dataset）和室内定位测试基准（InLoc indoor localization benchmark）中获得最先进的表现，同时在其他图像匹配和 3D 重建基准测试中也有竞争力。