Research on the 3D Reconstruction for Ultrasonic Image and Quantitative Identification for Lacuna

Based on reverse engineering (RE) techniques, the 3D model of actual parts is reconstruction. And then, the semitrailer 3D image about the position of lacuna is revealed in the model. According to comparability and incontinuity, the lacuna region on ultrasonic scanning image is plot out, and consequently the characteristics of lacuna are selected according to class. In finally, the rank identification method is adapted to recognize lacuna simply. By the application in real checking and measuring system, which has been developed by us, it is proved that aforementioned method is available and feasible.