| 摘要 |
In the case where a gray-scale difference Delta1 between a pixel 110a and a pixel 110b, a gray-scale difference Delta2 between the pixel 110b and a pixel 110c are each larger than a threshold value, and Delta1>Delta2, gray-scale values of the pixels 110a, 110b and 110c are corrected into the gray-scale value of the pixel 110b+Delta1×(1-alpha), the gray-scale value of the pixel 110c+Delta2×(1-alpha), and the gray-scale value of the pixel 110c+Delta2×beta, respectively (0@alpha, beta@0.5). After the correction, a gray-scale different Delta1a between the pixels 110a and 110b, and a gray-scale different 42a between the pixels 110b and 110c satisfy the following formulas: Delta1a>Delta1, and Delta2a>Delta2, respectively.
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