Computer vision system for mechanical workpiece measurement based onrelative positioning

• Main Authors: Ming-Mao Hsu, 徐銘懋
• Other Authors: Hsien-Huang Wu
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/33696979432002611994

碩士 === 國立雲林科技大學 === 通訊工程研究所碩士班 === 97 === Automatic Optical Inspection (AOI) has become more and more important 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: (1) Defect Inspection and Optical Measurement. Defect inspection includes PBC, IC, SMD, and etc. (2) 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. . The goal of this research is developed a PC-based system for automatic measuring of the parameters of motion blocks and the motion block is one of the main structures of Linear Guideway . In order to achieve the goal of this research, we must combine the technologies of machinery, electronics, optics and image processing. In this paper, the data and measurement data with the manual measurement error must be allowed to less than 20μm.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. Earlier stage, because of iii manual methods and the automatic measurement mode are different ways, leading to the position of its base have errors. Therefore, according to the manually measurement to change the algorithm, making the automatic measurement and the manually measurement are the same way, and getting the relative positioning.