Local surface shape recognition algorithm

To improve the design automatism and make the design more independent of design specialist, it is necessary to develop the intelligent CAD systems based on CBR (Case-based Reasoning). In the case-based intelligent computer aided stamping processing design system, it needs retrieve the former useful case by the local shape of the automobile panel surface. So auto recognition of the local shape of the automobile panel surface is the key issue. To quickly recognize the surface local shape, an improved method based on spin-images is presented. Then, in order to recognize the local shape more accurately, an altitude-image method is proposed and introduced into independently developed intelligent die-face CAD system based on CBR. By these two methods, the local 3D surface shape would be recognized quickly and accurately. The results show that the algorithm is effectual.