Study on Crack Detection System of PC Beam Surface

The surface of PC beam has been covered with cracks and flaws, it causes deficiencies to the safety of system. The inspection system includes inspection equipment and data off-line management. First discuss the theory of data acquisition. Then discuss the data off-line management, which include denoising, enhancement and segmentation. The denoising is based on anisotropic diffusion, which can preserve edge region of higher gradient, and smooth region of lower gradient. The enhancement is according to the characteristics of NSCT different domain, different operators are used in different subbands. The crack segmentation is based on Otsu method, which is according the convexity and concavity of histogram of detected image. The result shows that they can get good performance.