High precision measurements based on computer vision

• Main Authors: De-huei Wang, 王得輝
• Other Authors: Hsien-huang Wu
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/86305673696968847756

碩士 === 雲林科技大學 === 電機工程系碩士班 === 96 === Automatic Optical Inspection (AOI) has appeared more frequently in the industry of automatic manufacturing, especially in checking the quality of the products. AOI is good for inspect the flaw of products. There are many applications of AOI has been developed which can be divided into two categories: Defect Inspection and Optical Measurement. Defect inspection includes PBC, IC, SMD, and etc. Optical measurement contains electronic element, chip package, BAG etc. The advantages of automatic measurement are high stability, high efficiency, high trustiness, and it has become the trend in the manufacturing industry. Linear Guideways are mainly used in the rectilinear motion of machine. It is applied to machine for conveying objects, equipment for LCD making, tool machine, medical equipment, and equipments for automation. Motion Block is one of the main structures of Linear Guideway. The goal of this research is developed a PC-based system for automatic measuring of the parameters of motion block with a error value less than 20μm. In order to achieve the goal of this research, we must combine the technologies of machinery, electronics, optics and image processing. Before measuring the motion block, the block needs to be loaded manually and its type was selected to setup proper acquisition position based on the information in the database. And then the X-Y-Z table will move sequentially by following the data from the database. The position data will be used to take the camera to acquire the images of various parts of Motion Block. Based on the acquired images, the software will use efficient algorithm to estimate all the parameters need to be measured on the motion block and then store the results in the designated Excel file for later reference. Currently, measurement has been conducted successfully with HGH15 of Motion Block. However, problem of non-vertical surface layout has prevented us from obtaining correct measurement results for the Motion Block HGW25. This layout problem will be further investigated in the future study.