| 摘要 |
An image signal processing apparatus 1 has at least an input terminal 11 , a DCT transformer 13 , a low-pass filter 14 , a DCT transformer 16 , a functional operation processor 17 , and an inverse DCT transformer 18 . With input of an image at the input terminal 11 , the DCT transformer 13 acquires frequency components of the input image. On the other hand, the low-pass filter 14 performs a filtering process on the input image from the input terminal 11 to generate a filtered image. The DCT transformer 16 acquires frequency components of this image. The functional operation processor 17 performs a functional operation between some of the frequency components of the images before and after the filtering to generate frequency components of a function-operated image. The inverse DCT transformer 18 transforms the frequency components into pixel values and outputs them. |
