| 摘要 |
Methods and apparatus for producing an enhanced raster image from an original raster image are described. A set of initial sharpness values (28) are derived from the initial intensity values (26) of the pixels of the image. The initial sharpness values (28) are mapped to a set of corresponding enhanced sharpness values (30), and a set of enhanced intensity values (34) are derived from the enhanced sharpness values (30) to produce the enhanced raster image. As a result of the mapping, one or more of the enhanced sharpness values (30) are greater than the corresponding initial sharpness values (28) and one or more of the enhanced sharpness values (30) are less than the corresponding initial sharpness values (28). In another aspect, a background intensity value (42) is determined for each pixel of the raster image based upon the initial intensity values (40) for a plurality of pixels of the raster image, and the set of initial sharpness values (44) is derived from the background intensity values (42) and the initial intensity values (40). In another aspect, a graphical representation (46) of the mapping between initial sharpness values (44) and a set of enhanced sharpness values (48) is produced. The initial sharpness values (44) are mapped to a different set of enhanced sharpness values (48) in response to user actions (45) upon the graphical representation (46). |
