文档介绍：基于机器视觉的几何量精密测量系统的研究 ii Abstract The precision measurement of geometrical parameters is widely demanded on the industrial production and scientific research. In the recent years, with the continuous development of science-technology, the higher requirement on geomet rical parameters measurement is put forward in some field. However, the traditional measuring instrument for geometrical parameters has some disadvantage in the practical operat ion, such plicated reading process, long measuring cycle and high subjective error, which results in that it is difficult to meet the need of geometrical parameters measurement for precision parts. Th e precision measurement system for geometrical parameters via machine vision technology was designed, and the key technique including grating signal processing, Single Chip puter (SCM) control and image processing are researched in this paper. The ma in achievements are as follows: 1. The mechanical structure of the precision measurement system for geometrical parameters was designed. The system was built on the mechanical platform of universal tool microscope, grating scales were installed respectively in vertical and horizontal guide plate, which were used as displacement measurement device, and optical imaging system based D was designed. 2. The grating signal processing based on FPGA and SCM was researched. The grating signal processing circuit and the logic circuit of FPGA was designed, and the control program relevant to SCM piled, as a result, the signal from the two grating scales in vertical and horizontal direction was processed. 3. The image processing methods on the workpi ece and millimeter reticle in glass linear scale were researched. By using sub-pixel localization algorithm, the edge-localization algorithm based on Sobel operator and the least square fit method, line-localization algorithm and millime