Visual Appearance and Its Fidelity Evaluation of Computer-Displayed Still Images

Abstract

It seems that the visual appearance of a still image displayed in quasi-color is psychovisually different from that of in monochrome color. The visual impressions of computer-displayed images or reconstructed images are much affected by the various factors such as the size of image, pixel resolution, the number of gray level etc. It is pointed out that there is more or less a distinctive difference between the result of visual or subjective evaluations and the fidelity measure necessary for quantitatively estimating image quality. The purpose of this paper is to quantitatively evaluate the difference between two images by means of some fidelity measures in connection with the visual appearance of computer-displayed still images. Moreover, a difference image representation is extensively used in order to carry out the intuitive discrimination between an original image and a reconstructed image, on condition that the size of block pixel is specified as constant in advance.