Knowledge Transfer for Label-Efficient Monocular Height Estimation
Zhitong Xiong, Xiao Xiang Zhu · IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium · 2022
Estimating height from monocular remote sensing images is one of the most efficient ways for building large-scale 3D city models. However, existing deep learning based methods usu-ally require a large amount of training data, which could be cost-consuming or even not possible to obtain. Towards a label-efficient deep learning model, we propose a new task and dataset for weak-shot monocular height estimation. In this task, only the relative height labels between pairs of a small portion of points are given, which is cheaper and more friendly for humans to annotate. In addition, to enhance the model performance under the sparse and weak-shot super-vision, we propose a Transformer-based network for trans-ferring the learned knowledge from a large-scale synthetic dataset to real-world data. Experimental results have shown the effectiveness of the proposed method on a public dataset under the sparse and weak supervision.