A Spatial–Spectral Joint Attention Network for Change Detection in Multispectral Imagery

Abstract

Change detection determines and evaluates changes by comparing bi-temporal images, which is a challenging task in the remote-sensing field. To better exploit the high-level features, deep-learning-based change-detection methods have attracted researchers’ attention. Most deep-learning-based methods only explore the spatial–spectral features simultaneously. However, we assume the key spatial-change areas should be more important, and attention should be paid to the specific bands which can best reflect the changes. To achieve this goal, we propose the spatial–spectral joint attention network (SJAN). Compared with traditional methods, SJAN introduces the spatial–spectral attention mechanism to better explore the key changed areas and the key separable bands. To be more specific, a novel spatial-attention module is designed to extract the spatially key regions first. Secondly, the spectral-attention module is developed to adaptively focus on the separable bands of land-cover materials. Finally, a novel objective function is proposed to help the model to measure the similarity of learned spatial–spectral features from both spectrum amplitude and angle perspectives. The proposed SJAN is validated on three benchmark datasets. Comprehensive experiments have been conducted to demonstrate the effectiveness of the proposed SJAN.

RS-YOLOX: A High-Precision Detector for Object Detection in Satellite Remote Sensing Images

“…Li et al [51] combined the resnet-50 and the position attention module (PAM) to achieve high accuracy in the change detection of remote sensing images. Zhang et al [52] introduced a new spatial attention mechanism into the Siamese network, which also improved the accuracy of the model for detecting changes in multispectral images. Our research drew on these previous studies, and added the ECA attention mechanism after the backbone network of YOLOX, which improved the detection accuracy of the model.…”