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FE-LWS: Refined Image-Text Representations via Decoder Stacking and Fused Encodings for Remote Sensing Image Captioning

Remote sensing image captioning aims to generate descriptive text from remote sensing images, typically employing an encoder-decoder framework. In this setup, a convolutional neural network (CNN) extracts feature representations from the input image, which then guide the decoder in a sequence-to-sequence caption generation process. Although much research has focused on refining the decoder, the quality of image representations from the encoder remains crucial for accurate captioning. This paper introduces a novel approach that integrates features from two distinct CNN based encoders, capturing complementary information to enhance caption generation. Additionally, we propose a weighted averaging technique to combine the outputs of all GRUs in the stacked decoder. Furthermore, a comparison-based beam search strategy is incorporated to refine caption selection. The results demonstrate that our fusion-based approach, along with the enhanced stacked decoder, significantly outperforms both the transformer-based state-of-the-art model and other LSTM-based baselines.

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