Developing Novel Monocular-Vision-Based Standard Operational Procedures for Nondestructive Inspection on Constructed Concrete Cracks

To mitigate the limitations in traditional concrete crack-measuring methods such as low degree in automation and high cost, this study aims to develop a novel method with standard operational procedures (SOP) for nondestructive inspection and automeasure on bridge concrete cracks based on monocular vision and the Harris algorithm. Through experiments in four scenarios using commercially available software as the programming and imaging-processing interface, a novel method, named Mono-Harris, with high automation, high detection speed, and high precision for nondestructive inspection and automeasure of bridge concrete cracks based on monocular vision and the Harris algorithm was developed. There were three main criteria in the experiments, including the shooting angle (parallel and not parallel), shooting distance (far and near), and checkerboard target positioning. Results revealed positively that the combination of monocular vision and image processing technique could effectively measure bridge concrete cracks and the Mono-Harris method developed in this study was efficient and effective.