| 摘要 |
PROBLEM TO BE SOLVED: To enable keystone correction to be properly performed when an image of a writing surface of a white board is taken by a digital camera.SOLUTION: Characteristically, a white board includes a writing surface, and a mark for correction, which is provided at only a corner of the writing surface. The mark for correction, which is characterized by including marks indicating an aspect ratio of the writing surface, use application, an installation position and the like, is used for correction of an image taken by a digital camera and image data management. |
