| 摘要 |
A method of prefiltering is applied before data compression of scanned image data to better preserve important information. Before prefiltering, the image is segmented and tagged as belonging in a first region, such as a Lineart region, in which edges are the most important information, or a second region, such as a Contone or Halftone Region, in which pixel level is the most important information. For prefiltering, dynamic filters condition the image data passing into the two compressors. Each filter attempts to suppress noise associated with its particular channel by applying a smoothing filter, no filter or a sharpening filter based on segmentation tags and other characteristics of the data. |
