| 摘要 |
A measurement pattern having a predetermined shape and L-shaped black areas are superimposed and output to a liquid crystal panel, and a pattern is detected from a taken pattern image. Lines are detected based on an image of a screen frame in the pattern image, and coordinate conversion factors for conversion of camera coordinates in the taken image into panel coordinates are calculated based on panel coordinate values of the pattern and camera coordinate values of the pattern detected from the pattern image. Then, apexes of the screen frame in the panel coordinates are obtained based on the lines and the conversion coordinate factors detected with respect to each corner, correction values are calculated, and trapezoidal distortion correction is performed. |
