抄録
We previously developed and presented a theory and experimental results for the layered model of vision consisting of the external world, retina and brain. This model was shown to be very effective in evaluating image quality, and provides a means for comparative evaluations of various modulation methods. We have also proposed the equivalence approximation method, by which computation is made easier than the original model. The purpose of this paper is to propose the fixed equivalence approximation method. In this new method the window size is fixed, so there is no need to optimize the window size. This is a practical improvement, as the optimal window size are sometimes another size and may pose difficulty. We performed experiments using five kinds of modulation methods and three kinds of images. The results indicate that the proposed method gives an appropriate measure of objective evaluation that coincides with subjective evaluation, and can, therefore, be an alternative to the original model or equivalence approximation method. Moreover, the present method has an advantage of considerable time saving.
