Basic Relationship between Physical Cognition Degree of Shakiness and Unpleasantness

Abstract

The author has developed methods to estimate the unpleasantness degree of shaking images which should cause a certain harmful influence on viewers’ body. However, it was found that the estimation error of the unpleasantness degree could not be reduced to a level low enough when the unpleasantness would be directly estimated with the physical characteristics of the shaking images. Therefore in order to precisely estimate the unpleasantness degree, a new psychological index named “cognition degree of shakiness”, which occurs previous to the unpleasantness, was introduced. A series of evaluation experiments were carried, and the differences between the cognition degree of shakiness and the unpleasantness degree were found out to be caused by the influence of “shaking frequency”, “shaking duration”, “shape of shaking area”, and “viewing area size”.