Cloud detection plays a crucial role in remote sensing applications. To alleviate the annotation burden in fully supervised methods, weakly supervised cloud detection has received extensive attention recently. One standard approach performs cloud detection in a pixel-wise classification paradigm, which inevitably faces category ambiguity when detecting semitransparent clouds. To tackle this problem, we propose a novel weakly supervised cloud detection framework based on the diffusion model, termed CLDiff.

Here is a short implementation since the paper is under review. Further comprehensive details will be made available upon formal acceptance of the research paper.

GF-1 Cloud and Cloud Shadow Cover Validation Data: link

Landsat-8 Cloud Cover Assessment Validation Data: link

Sentinel-2 Cloud Mask Catalogue Data: link

Please run ./scripts/main_train_CLDiff_GF1.py for model training.

Please run ./scripts/eval_CLDiff_DDIM_GF1.py.py to get model predictions. Then all patches are spliced to their original size for evaluation.

The overall architecture of the CLDiff. CLDiff first uses an encoder with multi-scale feature rectification to generate cloud activations. Subsequently, the diffusion decoder applies Gaussian modulation function to recalibrate ambiguous activations around semitransparent clouds. Finally, these modulated activations serve as semantic guidance to optimize denoising network and recall semitransparent clouds. Here, T steps represent the multi-times diffusion process in diffusion decoder.