An image signal representing image information containing a periodic pattern is processed before it is broken up into halftone dots. First, the image information is averaged to generate an unsharpness signal, and then the unsharpness signal is processed for edge sharpness to generate a sharpness signal....http://www.google.fr/patents/US5065255?utm_source=gb-gplus-shareBrevet US5065255 - Method of and apparatus for smoothing an image having a periodic pattern
Method of and apparatus for smoothing an image having a periodic pattern
