| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce contouring artifacts in digital image processing. <P>SOLUTION: A method of enhancing the image quality of a quantized and decoded image includes steps of; changing a received image having a first bit depth to generate a first changed image having a second bit depth different from the first bit depth and attenuating a content of a higher frequency relatively to a low-frequency content of the changed image as a result; changing the image to form a second changed image on the basis of the first changed image so as to reduce a low-frequency content having the first bit depth; changing the second changed image so as to generate a third changed image in order to attenuate a low-amplitude content relatively to a high-amplitude content of the second changed image; changing the third changed image on the basis of the first changed image so as to increase the amount of a low-frequency content of the third changed image; and applying dither technologies to at least one of the image having the first bit depth, the first changed image, the second changed image, and the third changed image. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
