Patent ID: 6943808
Filing Date: 2005-09-13
Classification: G06T,H04N

Abstract:
1. A method of reducing aliasing in a digital image, comprising: providing a digital image; for each separation, selecting a halftone screen for halftoning the digital image, wherein the halftone screen has a directional component associated with it; filtering the digital image with an antialiasing filter, the antialiasing filter having been designed to have a directional frequency response that is optimized for the directional component of the selected halftone screen, such that the antialiasing filter would aggressively blur the image detail that would have interacted with the halftone screen, while minimally blurring the image detail that would not have interacted, wherein when the image is blurred in one direction for one separation, the apparent visual sharpness may be carried by the less-disturbed detail in one of the other separations; and halftoning the filtered digital image.