Prior to printing on a digital printer a halftone reproduction of a continuous one original image, digital image signals are corrected for the effects of printed dot overlap generated by a particular chosen digital printer. The dot overlap correction is based upon superimposing a virtual screen on the...http://www.google.com.tw/patents/US5469267?utm_source=gb-gplus-share專利 US5469267 - Halftone correction system
