| Title |
Development of Vision system for Back Light Unit of Defect |
| Authors |
한창호(Han, Chang-Ho) ; 오춘석(Oh, Choon-Suk) ; 유영기(Ryu, Young-Kee) ; 조상희(Cho, Sang-Hee) |
| Keywords |
Machine Vision ; Inspection ; Back Light Unit ; Image Processing |
| Abstract |
In this thesis we designed the vision system to inspect the defect of a back light unit of plat panel display device. The vision system is divided into hardware and inspection algorithm of defect. Hardware components consist of illumination part, robot-arm controller part and image-acquisition part. Illumination part is made of acrylic panel for light diffusion and five 36W FPL's(Fluorescent Parallel Lamp) and electronic ballast with low frequency harmonics. The CCD(Charge-Coupled Device) camera of image-acquisition part is able to acquire the bright image by the light coming from lamp. The image-acquisition part is composed of CCD camera and frame grabber. The robot-arm controller part has a role to let the CCD camera move to the desired position. To take inspections of surface images of a flat panel display it can be controlled and located every nook and comer. Images obtained by robot-arm and image-acquisition board are saved on the hard-disk through windows programming and are tested whether there are defects by using the image processing algorithms. |