| 摘要 |
PURPOSE:To prevent the moire with the low-priced constitution and in a short time by omitting the smoothing filter of an image processing part when a dot image, etc., are processed. CONSTITUTION:In a quantization matrix storage part 206, a quantization matrix which fine by quantizes the low order coefficients so as to be coincident with the visual sense characteristic of humans is installed. A quantization part 203 quantizes the DCT coefficient value transformed by a DCT transformation part 202 with the quantization matrix of the quantization matrix storing part 206. For the quantization matrix stored in a quantization matrix storing part 212, when the value of a high frequency component is set to '0', and the moire occurs at an output image like the case when the image is a dot, an inverse quantization part 209 carries out quantization by using the quantization matrix of the quantization matrix storage part 212. |
