Patent ID: 7295346

Claim:
In a system for processing document images, a method for antialiasing at least one input image to provide an antialiased image, comprising: receiving the input image; processing said received input image by operation of an antialiasing filter to create an antialiased image, the antialiasing filter operation including: (1) determining one or more regions within the received image, (2) detecting that at least one of the one or more determined regions contains pixels having pixel values of a background image level that adjoin pixels of an unsaturated image object having unsaturated pixel values in a range other than a predetermined range of limit values, thereby identifying an edge of the unsaturated image object, and (3) setting pixel values of edge pixels of the edge of the unsaturated image object to obtain a desired uniformity of edge pixel values for the unsaturated image object in the at least one detected region; and outputting the antialiased image.