Change Captioning in Remote Sensing: Evolution to SAT-Cap -- A Single-Stage Transformer Approach

Yuduo Wang; Weikang Yu; Pedram Ghamisi

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arXiv · 2501.08114

Change Captioning in Remote Sensing: Evolution to SAT-Cap -- A Single-Stage Transformer Approach

Yuduo Wang·Weikang Yu·Pedram Ghamisi

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Abstract

Change captioning has become essential for accurately describing changes in multi-temporal remote sensing data, providing an intuitive way to monitor Earth's dynamics through natural language. However, existing change captioning methods face two key challenges: high computational demands due to multistage fusion strategy, and insufficient detail in object descriptions due to limited semantic extraction from individual images. To solve these challenges, we propose SAT-Cap based on the transformers model with a single-stage feature fusion for remote sensing change captioning. In particular, SAT-Cap integrates a Spatial-Channel Attention Encoder, a Difference-Guided Fusion module, and a Caption Decoder. Compared to typical models that require multi-stage fusion in transformer encoder and fusion module, SAT-Cap uses only a simple cosine similarity-based fusion module for information integration, reducing the complexity of the model architecture. By jointly modeling spatial and channel information in Spatial-Channel Attention Encoder, our approach significantly enhances the model's ability to extract semantic information from objects in multi-temporal remote sensing images. Extensive experiments validate the effectiveness of SAT-Cap, achieving CIDEr scores of 140.23% on the LEVIR-CC dataset and 97.74% on the DUBAI-CC dataset, surpassing current state-of-the-art methods. The code and pre-trained models will be available online.

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Yuduo Wang, Weikang Yu, Pedram Ghamisi. 2025-01-14. Change Captioning in Remote Sensing: Evolution to SAT-Cap -- A Single-Stage Transformer Approach. https://arxiv.org/abs/2501.08114

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