Concrete defect

we introduce our Hard Defect Classification Dataset (HDCD), which is primarily constructed based on the Multi Classifier Data (MCD) [38], a multi-source dataset comprising self-collected image samples along with contributions from several Departments of transportation inspection databases. Initially, we integrated data from diverse sources based on the defect classification criteria of the MCD. Subsequently, we partitioned the dataset into a training set and a test set. To simulate real-world challenges, we specifically curated the test set to include hard samples