由一般光照条件下的图像生成实体形态的理论与方法研究

The shape measurement and geometric modeling are strongly connected. And with the development of reverse engineering, reconstruction CAD models from real parts has become an important geometric modeling method. Human and animal can judge the surrounding 3-D geometry relationship accurately according to the 2-D image on the retina, which implies that creating 3-D shape from its 2-D images under common light conditions is feasible. And this method differs from the traditional methods in that it need to prove up the correlation between the 3-D shape of object and the visual information such as contour, luminance and color etc. contained in the intensity image, and to realize the conversion algorithm for visual information and geometry dimension.In this project, research has been made mainly on two aspects: in the first aspect, the shape measurement based on intensity images under various conditions and geometric modeling methods have been researched; and in the second aspect, combined with engineering field, the systems to realize these methods have been researched.The contributions of this project in the first aspect are followed:1. Introduce a new measurement method combinng shape from shading (SFS) and point correspondences.2. Introduce a new way to solve SFS problem using B-spline variation algorithm.3. Introduce a new visual method for 3-D reconstruction of the textureless free-form urface.Intensive foundational studies have also been made on the mathematics models of aboving methods.And in the application aspect:1. Develop a 3D scanner system using a hand-held laser source, which combines the shape data collected from laser scan and camera and simplifies the measurement process. The precision of 3-D reconstruction surface is higher.2. For cars and ceramic products etc., develop a 3-D reconstruction system from 2-D image obtained by a digital video.This project is about to deepen in the theory research and application generalization on the basis of above results, to introduce numerical manifold method to improve the algorithm's efficiency, and combining with medical filed to cooperate with relevant hospitals to develop applicable medical system used for dental treatment etc.

复杂形体的几何造型与形式设计是困扰CAD界的一大难题。本项目研究一般光照条件下物体耐枷裥蛄卸晕锾寮负翁卣骷靶问缴杓铺卣鞯南拗疲捎弥鸫畏指睢⒂纱旨熬牟呗裕岢霾⑹迪忠恢中碌哪嫦蛟煨头椒ǎ凰唤瞿芑指慈堤宓募负涡畔ⅲ鼓芑指次锾灞砻娴纳省⑼及傅刃问缴杓菩畔ⅲ┐驝AD用互提供一种全面、快速的复杂形体设计手段。.