| 摘要 |
PROBLEM TO BE SOLVED: To accurately determine whether each processing target pixel is positioned at an edge part in an input image containing noise.SOLUTION: An input image is subjected to detection (21) of a wide-range edge index using pixels in a wide range and detection (24) of a narrow-range edge index using pixels in a narrow range, and edge determination is performed (27) on the basis of the maximum value (AWmx) of the wide-range edge index, the maximum value (ANmx) of the narrow-range edge index, and a ratio (PR) of the maximum value of the wide-range edge index to an average value thereof. When it is determined that there is an edge, a direction in which the wide-range edge index is maximum is determined as an edge direction. |
