Our earlier study demonstrated that the subjective sharpness of blurred images is improved by superimposing granular noise on it. We proposed that we have memory of textures of certain familiar objects encountered in daily life, similar to memory color. As de- scribed herein, for five objects, we used sample images of six kinds: the original image, a white-noise-added original image, a 1/ f-noise-added original image, a blurred original image, a white-noise-added blurred image, and a 1/f-noise-added blurred image. First, observers were asked to recall an object’s texture without seeing the real object and to sort the images in descending order, starting with the one closest to the recalled texture. While viewing the actual object, observers were asked to rearrange the images in descending order, starting with the one closest to the actual texture. Finally, observers were asked to rearrange the images in descend- ing order of subjective sharpness. Correlation analysis, partial analysis, and path analysis were conducted for this reported ordering. Correlation was found between the memory texture and subjective sharpness. Results demonstrate that subjective sharpness im- proved when the texture of the objects in images came to approximate the remembered texture.
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