| 摘要 |
<p>PROBLEM TO BE SOLVED: To allow the interpolation arithmetic unit to interpolate an image edge smoothly and sharply and to adjust sharpness of internally structured data. SOLUTION: Based on primary image data (original image data) Sorg stored in a storage means 10, an edge presence discrimination means 31 discriminates whether or not an interpolated point belongs to an edge part and selects either of two interpolation arithmetic means (1st, 2nd) 40, 50 adopting different interpolation methods from each other depending on the presence of the edge and selects either of two arithmetic means (1st, 2nd) 45, 46 adopting different interpolation methods from each other depending on the edge extension direction. When it is discriminated that the edge is extended in an oblique direction, an area division means 43 and an area selection means 44 divide unit grating of the original image into two with a diagonal line along the edge extension direction and use primary image data Sorg at three grating points forming an area including the interpolation point to calculate secondary image data.</p> |
