| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method and system for descreening a digitally scanned document. <P>SOLUTION: A method and system for descreening an image signal utilizing a bank of filters to provide several increasingly blurred versions of the original image signal is disclosed. At any given time, only two of these blurred versions are created, on a pixel-by-pixel basis. The outputs from the selected pair of blurred signals are then blended together to create a variable blending output that can vary smoothly from no blurring to maximum blurring in a smooth and continuous manner. In addition, the method provides the capability to enhance text and line art by using a variable unsharp masking mechanism with independent post-blur sharpening control, and the capability to detect and enhance neutral (no-color) output pixels. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
