Update README.md

README.md

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 Checkpoint of CrackNex: a Few-shot Low-light Crack Segmentation Model Based on Retinex Theory for UAV Inspections (https://huggingface.co/papers/2403.03063).
 
 ## Model Description
-This CrackNex checkpoint is for low-light crack segmentation utilizing few-shot. All model details can be found in the paper.
+These CrackNex checkpoints are for low-light crack segmentation utilizing few-shot. All model details can be found in the paper.
 
 ## Notes
-We also provide processed dataset as LCSD.zip file in this repo.
+We also provide processed dataset as LCSD.zip file and pretrained backbone (ResNet) in this repo.