Partially correlated minimum visibility halftone patterns for digital printers

Abstract

Abstract A method for halftoning a digital image having an x,y array of pixels each having an associated input pixel value, includes the steps of providing a memory containing a dither bitmap for each input pixel value of the digital image where the dither bitmaps are partially correlated; selecting a dither bitmap corresponding to the input pixel value for a pixel in said digital image; modularly addressing the selected dither bitmap with the location of said pixel to obtain an output halftone image value; and repeating steps for each pixel in the digital image. In one embodiment the partially correlated bitmaps are designed to minimise a visual cost function which comprises a combination of frequency components of a dither bitmap frequency spectrum where the frequency components have been weighted by a human visual system sensitivity function.

Inventors

• 👤 Kevin Edward Eastman Kodak Company Spaulding
• 👤 Rodney L. Eastman Kodak Company Miller

Bibliographic Details