Patent ID: 7417771

Claim:
A method of selecting an intensity threshold in a halftoning system used to render respective pixels of an image on a display, said halftoning system providing respective accumulated errors, each based on at least one respective variance between a rendered intensity of a pixel and a quantized measured intensity of a corresponding pixel of a contone image to be displayed, each respective accumulated error subject to recalculation pixel-by-pixel, said method comprising the steps of: (a) selecting a first predetermined intensity threshold if either one of said accumulated errors of a current pixel and a neighboring pixel exceeds a first error threshold; (b) selecting a second predetermined intensity threshold if said accumulated error of a pixel remotely neighboring said current pixel exceeds a second error threshold and said first predetermined intensity threshold is not selected; (c) selecting a third predetermined intensity threshold if neither of said first and said second intensity thresholds are selected; and (d) rendering a pixel of said image on a display based upon said selected predetermined intensity threshold.