| 摘要 |
<P>PROBLEM TO BE SOLVED: To make correctly determinable whether a texture has a flat pattern to not. <P>SOLUTION: An image is divided into small regions of a prescribed size in a step S3, and the texture feature quantity of image data corresponding to each small regions is calculated in a step S7. For example, the image data corresponding to the small region are converted into complex numbers by a two-dimensional DFT, and the absolute values of the complex numbers are distributed on a two-dimensional frequency flat plate. The center of gravity of the right half of the two-dimensional frequency flat plane is found based on the distribution, then a first feature quantity expressed by the distance between the origin and the center of gravity of the two-dimensional frequency flat plane is obtained. The smaller the first feature quantity is, it is judged to be a texture of clear pattern, and the larger the first feature quantity is, it is judged to be a texture of obscure (flat) pattern. <P>COPYRIGHT: (C)2003,JPO |
