| Title |
An Effective Auto-Focusing Method for Curved Panel Inspection System |
| Authors |
이황주(Lee, Hwang-Ju) ; 박태형(Park, Tae-Hyoung) |
| DOI |
https://doi.org/10.5370/KIEE.2017.66.4.709 |
| Keywords |
Auto-focusing ; Curved panel ; Curve estimation ; Lagrange polynomial |
| Abstract |
The curved panel is widely used for display of TVs and smart phones. This paper proposes a new auto-focusing method for curved panel inspection system. Since the distance between the camera and the panel varies with the curve position, the camera should change its focus at every inspection time. In order to reduce the focusing time, we propose an effective focusing method that considers the mathematical model of panel curve. The Lagrange polynomial equation is applied to modeling the panel curve. The foci of initial three points are used to get the curve equation, and the other foci are calculated automatically from the curve equation. The experiment result shows that the proposed method can reduce the focusing time. |