| 摘要 |
PROBLEM TO BE SOLVED: To provide a predictor capable of executing prediction adapted to an edge direction even when an edge in an optional direction is present. SOLUTION: The weighted average of pixel pairs adjacent in horizontal, vertical, 45°diagonal and -45°diagonal directions to the respective pixels of a prediction reference region is defined as a gradient in each direction. The weighted average of the pixel values of at least two pixels among four adjacent pixels adjacent in the respective horizontal, vertical, 45°diagonal and -45°diagonal directions to an object pixel is computed and the weighted average is outputted as the predicted value of the pixel value of the object pixel. At the time, in the weighted average, the weight of the pixel value of each pixel is made proportional to the inverse number of the gradient in the adjacent direction of the pixel. COPYRIGHT: (C)2008,JPO&INPIT
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