Implementation of light spot positioning system using Lab-view based image module and its applications

• Main Authors: TSAI-CHAO MING, 蔡肇銘
• Other Authors: Wen-Kai Kuo
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/gv32dx

碩士 === 國立虎尾科技大學 === 光電與材料科技研究所 === 97 === This paper presents that the laser light position using computer calculation make mouse index move to laser light position and then achieve the interactions between humans and machines. The calculation is the eliminations of odd frame and even frame due to light and dark changes from illuminant of laser pen. The light position system operation and control axis are designed by a commercial software package, Lab-VIEW (Laboratory Virtual Instrument Engineering Workbench). According to the light and dark changes and bright spread from laser pen, web camera gets two continuous frames, odd frame with laser spots and even frame without laser spots, and then gets one laser spot image from the elimination of two frames. The lightest position on CMOS sensor X/Y coordinates in laser image is calculated by Lab-view. In order to get the opposite positions between projection screen effect area and the coordinates of computer screen, the projection screen and the web camera resolution are adjusted. As the lightest position of laser point in CMOS sensor is recognized, the mouse index can be moved to the opposite position of computer screen and achieve the interactions between humans and machines. Additionally, all calculations are through computer and simplify other external circuit, for example, to process images by FPGA or DSP (Digital signal processing). The processes are three steps. First, the computer call DLL to get image by connecting web camera. Second, the laser spot coordinate position on web camera could be got by image process identification. Finally, the mouse index is moved to laser point position for chasing the laser index.