| 摘要 |
PROBLEM TO BE SOLVED: To automatically process the perspective using gradation with high efficiency by changing the cut frequency of a digital LPF into the value that is accordant with the distance of a processing object. SOLUTION: When an image is displayed on a display screen, the number of dots of the image analog signal varies on the image which represents the minimum size of an object that can be identified by the corresponding human eyes between the waves of long and short cycles. In other words, the out-of focus effect is represented by operating the highest frequency included in the image data of sampling frequency. The highest frequency component included in the original image data is equal to fs /2 (fs : sampling frequency). When fs =kfm (0<k<1) is satisfied against the highest frequency fm and the cut frequency fd of an LPF, (k) is changed into the value that is accordant with the distance of the processing object. As a result, the image data can be freely produced in response to the perspective. |
