研究目的
To address the limitations of existing deep neural network-based change detection methods that do not fully utilize spectral and spatial information and explore the underlying information of fused features, by proposing a Spectral-Spatial Joint Learning Network (SSJLN) for improved change detection in remote sensing.
研究成果
The proposed SSJLN effectively integrates spectral and spatial information and explores underlying fused features, achieving superior change detection performance on multiple datasets compared to state-of-the-art methods. Future work will focus on weighting central pixels in patches and addressing sample imbalance.
研究不足
The patch-based input assumes adjacent pixels belong to the same class, which may not always hold. The central pixel in the patch is not weighted more than surrounding pixels, potentially limiting feature extraction. Sample imbalance and generalization to long-term changes are noted as areas for future improvement.
1:Experimental Design and Method Selection:
The study proposes an end-to-end deep neural network called SSJLN, which includes spectral-spatial joint representation (similar to Siamese CNN), feature fusion using difference strategy, and discrimination learning with fully connected layers. A new loss function combining contrastive loss and cross-entropy loss is used.
2:Sample Selection and Data Sources:
Four real multispectral datasets are used: Taizhou and Kunshan from Landsat 7 ETM+ sensor, and Minfeng and Hongqi Canal from GF-1 satellite. Ground truth is obtained from references.
3:List of Experimental Equipment and Materials:
No specific equipment or materials are mentioned beyond the datasets and computational setup for deep learning.
4:Experimental Procedures and Operational Workflow:
Patches of size 5x5 are extracted from images, fed into SSJLN for training with supervised labels. Stochastic gradient descent is used for optimization. Testing involves feeding pairwise patches to the trained model for prediction.
5:Data Analysis Methods:
Performance is evaluated using overall accuracy (OA), Kappa coefficient (KC), and AUC values from ROC curves.
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