| 摘要 |
The present invention detects the display unevenness of a display device with high accuracy. The output image data of the display image of a liquid crystal panel display (3), which is obtained from a CCD camera (5), is addressed and the pixel value of each pixel of the liquid crystal panel display (3) is acquired. Then, the differential pixel value of each pixel is acquired in order to detect the display unevenness of the liquid crystal panel display (3). When doing so, an integral pixel value is acquired by averaging the pixel value of each pixel with the pixel values of peripheral pixels, the integral pixel value is subtracted from the original pixel value of the corresponding pixel, and the value thus obtained is acquired as the differential pixel value for each pixel. It is possible to remove the low-frequency components such as offsets from the pixel value distribution of the adjacent pixels and to retain the high-frequency components that are the same as the display unevenness by acquiring the differential pixel value by means of integration and differentiation. As a consequence, it is possible to detect the display unevenness of a liquid crystal panel display (3) with a higher accuracy than when the differential pixel value of each pixel is acquired by means of the difference between the output image data and the input image data. |
