We present a Visual Place Recognition system that follows the two-stage format common to image retrieval pipelines. The system encodes images of places by employing the activations of different layers of a pre-trained, off-the-shelf, VGG16 Convolutional Neural Network (CNN) architecture. In the first stage of our method and given a query image of a place, a number of top candidate images is retrieved from a previously stored database of places. In the second stage, we propose an exhaustive comparison of the query image against these candidates by encoding semantic and spatial information in the form of CNN features. Results from our approach outperform by a large margin state-of-the-art visual place recognition methods on five of the most commonly used benchmark datasets. The performance gain is especially remarkable on the most challenging datasets, with more than a twofold recognition improvement with respect to the latest published work.

该研究提出了一种采用卷积神经网络（VGG16）的激活层对地点图像进行编码的视觉地点识别系统。该系统采用了类似于图像检索流程的两阶段方法，并在第二阶段使用CNN特征来编码语义和空间信息，其效果在常见基准数据集上明显优于其他方法。

基于 Spatio-Semantic ConvNet 的视觉地点识别