Enhancement halftoning

Details Enhancement halftoning Enhancement halftoning

H - Electricity

04

N

314/7, 178/3.1

H04N 1/00 (2006.01) H04N 1/40 (2006.01) H04N 1/405 (2006.01)

Patent

CA 1226527

ABSTRACT A method of determining image input contrast to dynamically adjust screen amplitude. The screen amplitude is controlled on a dot by dot basis to selectively enhance the original image. There is a higher amplitude when the input contrast is low and a lower amplitude when the input contrast is high. Thus, the partial dots more closely follow image detail at high contrast, while at low contrasts, noise is not enhanced. In a specific embodiment, depending upon the input contrast, a predetermined screen amplitude is used.

463337

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