扇の歪みを評価するアプリの開発

抄録

A two-dimensional fan painting may be a perfect circle, but if a bone is inserted into the painting and it is made into a fan, it will become an oval; the fan will be distorted. The way in which it distorts also depends on the length of the bone. By utilizing this distortion, it is possible to express a story with the fan, for example by changing the emotions of the characters or the behavior of the characters depending on the viewing angle. However, as mentioned above, each side distorts differently, making composition difficult. The authors have clarified the mathematics behind how the distortion occurs, and show that it is now possible to recreate the original charm of the fan, such as a collaboration between the fan and tanka, where the upper verse and the scenery can be seen when viewed from the left, and the lower verse and the scenery when viewed from the right.