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In recent years, there are signs and advertisements that use optical illusions. By using the optical illusion, it is easy to not only attract attention but also leave an impression. In addition, characters are always used in advertisements. The design of characters to be impressive is called lettering. Accordingly, we expect that adding an illusion to the lettering process can generate more impressive characters. However, it takes a lot of experience and time to take the illusion into account when lettering. In this paper, we add the illusion of impossible shapes to the lettering process to automatically generate more memorable characters. An impossible shape is a figure which can be recognized visually as a three-dimensional projection, but which cannot exist in reality. In this method, the strokes and contours are extracted from line-drawing characters. Then, the projected image is created by using them. Finally, impossible shape is generated by applying an optical illusion to the projected image.
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