Research Of Segment Fitting Method For High Resolution Measurement Of 3d Profile And Its Display Technology

With the development of modern industrial, the 3-D measurement technology appears and become the key point in the research area. With the projector technology, computer technology, image processing and high-tech development, optical non-contact measurement technique is widely used, especially the three-dimensional profile measurement technology base on structure light has regarded as the most promising of three-dimensional topography measurement method. On the vase of the analysis of the 3-D optical measurement system, this thesis researched the measurement resolution in the detail an this research has more extensive and obvious practical significance, academic significance and social values.This thesis finished some works as follow: First, it introduced the fundamental about 3-D profile measurement and its development in domestic and abroad. In chapter two, it introduces the basic principle of three-dimensional profile measurement based on grating projection. The basic theory of three-dimensional profile measurement based on phase shifting and the phase unwrapping method are discussed, where phase measuring profilometry and the principle of phase unwrapping are especially analyzed. Chapter three makes a computer simulated experiment and real practice, the hardware system and software system for 3-D profile measurement was design. The analysis of the calculating precise and measure errors was analyzed in chapter four, and proposed a new section fit filtering method for improving the measurement accuracy of 3-D profile measurement with the structure light. Chapter five introduces the rendering 3-D graphics and 3-D graphics rendering software is developed with VC++.This paper mainly has the following innovations:1. A simple and inexpensive hardware system was constructed, the system required only digital projector, CCD camera, computer and the corresponding dock system, the hardware system is simple, easy, and inexpensive and higher reliability.2. A program which use phase measuring profilometry to make 3-D shape measurement is done with visual VC++. This program operates easily, achieves the desired design purpose and laid a foundation for the effective use of instruments.3. A new section fit filtering method was given, and it can effectively filter out noise and improve the system accuracy.4. The show section is finished with OpenGL graphics interface technique, which makes observation more visual.