Abstract
The authors have developed systems that individually estimate the unpleasantness degree that is evoked when viewers watch images including one of shakiness, flicker or stripes. The systems, however, were not constructed to estimate the unpleasantness degree that is evoked when viewers watch images complexly including these unpleasantness factors. We derived a series of experiments in order to investigate the relationship between individual unpleasantness degree of images including each unpleasantness factor and total unpleasantness degree of images including plural unpleasantness factors, then, we found out the adequate nonlinear summation model to estimate the total unpleasantness degree.