Research on Aircraft Skin Cracks Recognition Based on the Crack-Isolated Method

A crack-isolated method is proposed for the detection of aircraft skin crack defects. It takes the rivet detection based on the magneto-optic images as the clue to detect skin cracks. Firstly, the rivet sites are classified according to the circularity of candidate sites after images pre-processing. Secondly, a circle template is constructed by the rivet center and radius to cover rivet sites, and then the potential crack regions are isolated from the template region. Finally, cracks' existence and direction are determined according to isolated regions' area and shape. The experimental results prove the effectiveness of the crack-isolated method in segmenting crack regions and detecting multi-cracks.