Abstract
The amount of visual illusion of the test pattern has been estimated by comparison between the test pattern width and control one, where the comparison pattern has constant figure. Various test patterns have been examined under the constant test condition. The results are as follows:
When a checkered pattern of the back ground is coarse, the amount of visual illusion is small. The amount of visual illusion is slightly larger when the back ground swings. The amount of visual illusion on the black back ground is slightly larger than that on the white back ground. There is no significant difference between narrow stripe and wide one. Black pattern is judged to be the most narrow of all, and then white pattern is judged to be slightly wider. The pattern with horizontal stripes was judged to be more narrow than one with vertical stripes. Long pattern is judged to be the widest of all.
Repeat of experiment, size of back ground and other experimental conditions have no influence on illusion.
