After the Poggendorff Illusion was discovered, it has been the object of a great deal of research regarding condition of graph and the quantity of visual illusion. With the progress of technology, the quantity of visual illusion is measured by computers and recorded by pixels. The measurement of visual illusion thus been brought to a more accurate level. Covered colors (white, black, yellow, and blue) cause differences on visual illusions and the program designed by Akiyoshi Kitoaka was utilized. In the first experiment, we removed the left-side slash beside the four covered-color bars from top to bottom. In the second experiment, we removed the slash from bottom to top. In both experiments, one-way ANOVA tests indicated that the four covered colors caused different performances on visual illusion. In addition, the LSD post hoc further pointed out that the significant differences existed in four places. They were white vs. yellow, white vs. blue, black vs. yellow, and black vs. blue. Results demonstrated that the quantity of visual illusion of white and black are both higher than that of yellow and blue. Comparing the differences between white and black and between yellow and blue, we found that there are no significant differences. The overall quantity of visual illusion in the first experiment is 27.556 pixels, and that is higher than 11.196 pixels in the second experiment. The average is 19.376 pixels. The result of this study could be useful to visual perception researchers and designers.
After the Poggendorff Illusion was discovered, it has been the object of a great deal of research regarding condition of graph and the quantity of visual illusion. With the progress of technology, the quantity of visual illusion is measured by computers and recorded by pixels. The measurement of visual illusion thus been brought to a more accurate level. Covered colors (white, black, yellow, and blue) cause differences on visual illusions and the program designed by Akiyoshi Kitoaka was utilized. In the first experiment, we removed the left-side slash beside the four covered-color bars from top to bottom. In the second experiment, we removed the slash from bottom to top. In both experiments, one-way ANOVA tests indicated that the four covered colors caused different performances on visual illusion. In addition, the LSD post hoc further pointed out that the significant differences existed in four places. They were white vs. yellow, white vs. blue, black vs. yellow, and black vs. blue. Results demonstrated that the quantity of visual illusion of white and black are both higher than that of yellow and blue. Comparing the differences between white and black and between yellow and blue, we found that there are no significant differences. The overall quantity of visual illusion in the first experiment is 27.556 pixels, and that is higher than 11.196 pixels in the second experiment. The average is 19.376 pixels. The result of this study could be useful to visual perception researchers and designers.