FIG. 9 is a diagram schematically illustrating an example where a current pixel is compared in intensity with neighboring pixels and the intensities are grouped into four categories. Referring to FIG. 9, FIGS. 9(a) to 9(d) illustrate distributions of a current pixel (C) and neighboring pixels for each category. The category illustrated in FIG. 9(a) indicates a case where intensities of two neighboring pixels are greater than that of the current pixel (C). The category illustrated in FIG. 9(b) indicates a case where the intensity of one pixel of two neighboring pixels of the current pixel is smaller than that of the current pixel. The category illustrated in FIG. 9(c) indicates a case where the intensity of one pixel of two neighboring pixels of the current pixel is greater than that of the current pixel. The category illustrated in FIG. 9(d) indicates a case where intensities of two neighboring pixels of the current pixel are greater than that of the current pixel.
For example, FIGS. 9(a) and 9(b) illustrate cases where the intensity of the current pixel is greater or smaller than those of the neighboring pixels. FIGS. 9(b) and 9(d) may appear when the current pixel is located at a boundary of a predetermined region.
Table 1 schematically shows four categories illustrated in FIG. 9.
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