THRESHOLD EFFECT IN VISUAL-PERCEPTION OF GEOMETRICAL FIGURES

Filtering of the input image has been shown to play a central role in several aspects of visual perception. In our experiments in visual per ception of the area of geometrical figures the orientation in random d ot patterns, and some visual illusions, we have shown that a threshold effect inferred from the filtering of the input image produces a perc eptual error. This error has been explained by using the concept of Im age Function. The present paper is a brief review of our experimental results and of the models we have proposed.