Concrete materials and structures are extensively used in transformation infrastructure and they usually bear cracks during their long-term operation.Detecting cracks using deep-learning algorithms like YOLOv3 (You Only Look Once version 3) is a new trend to pursue intelligent detection of concrete surface cracks.YOLOv3 is a typical deep-learning algorithm used for object detection.Owing to its generality, YOLOv3 lacks specific efficiency and accuracy in identifying concrete surface cracks.An improved algorithm ba…