| 摘要 |
The present invention relates to a device and a method to inspect an appearance of a transparent substrate; and the present invention accurately detects a crack of a correction blank. To solve this problem, the correction blank (1) is mounted on a glass plate (2); green light is radiated as transmitted light; and red light which is out of the transmitted light is radiated from a lower side of the glass plate (2) on the glass plate (2) and the correction blank (1). Red light is radiated as reflection light from an upper side of the glass plate (2). A diffusion penetration image (30a) by the red light, a regular penetration image (30b) by the green light, and a diffusion reflection image (30c) by the blue light are generated by a photographing image (20). An image processing device (30) obtains a composed image (30d) by composing the diffusion penetration image (30a), the regular penetration image (30b), and the diffusion reflection image (30c). A crack part (1a) of the correction blank (1) is detected by the composed image (30d). |
