We proposs a novel method for generating a periodical texture image (patchwork) by means of cutting out a patch in a natural texture image using dynamic programming (DP) and aligning the copys of the patch two dimensiona11y with no gap. On the patchwork generated by this method, the seams between neighboring patches are inconspicuous. As experimental results, the patches extracted from natural textures and the patchworks made of these patches aligned two dimensionally are shown. Finally, the availability of the method proposed here is discussed.

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In this paper we have defined the quantitative measurement for the evaluation of image quality in the discrete cosine transform domain. We have also obtained the algorithm which minimizes the amount of information, making this measurement of quality constant when coding the image. When coding the image the amount of information varies according to the image, but this does not present a problem because we store the images in memory. Furthermore, it is not a problem when we transfer the images if we use only the packet-switched networks. Using computer simulation we found the value of this quantative measurement of the quality of the image to be excellent because the differences between the original and the processed images were negligible.

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This paper presents the Selective Color Correction Method for full color hardcopy which contains two steps. The first one is to select the color (Y, M, C, R, G, B). In selecting the color, there are two choices. One is to select the color subspace that each pixel belongs to. The other is to select the primary color(Y, M, C), secondary color(YM, YC, MC) or tertiary color(YMC) that each pixel has. The second step is to change the value of Y, M.C corresponding to the selected color. We have simulated this method and confirmed its effectiveness.

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This paper proposes a novel method for acquiring super high definition pictures by processing stereoscopic images. Fundamental experiments have shown that high resolution signals can be reconstructed by the proposed method. This paper also presents a framework of super high definition television which is expected to integrate all visual information signals including data for printing as well as normal TV. Problems relating to super high definition images are discussed.

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Effects of toner surface-charge sensity (q/St) and toner particle size (d 50) on image qualities (i.e. image density in solid area, resolution of line images and reproduction of dot images) of the electrophotographic images have been examined by varying the toner surface-area median size (d 50) from 6.8 to 13.5 μm in the two-component development system employing the insulative carrier particles. It has been found that the development efficiency in the solid area is determined by the toner surface-charge density (q/St) independent of the toner size (d 50), not by the toner charge-to-mass ratio (q/m) as formulated by Schein and by the other workers, and that the width of a line image broadens by four toner particles (4 d 50), then the resolution of line images is determined by the reciprocal of the broadening.

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