Patent ID: 6118935
Filing Date: 2000-09-12
Classification: H04N

Abstract:
A method of digital halftone imaging for generating an improved digital image output from a gray tone image received from an image source, comprising the steps of:generating a first image component from the gray scale image received, by using a first dispersed dot screening pattern, said first image component being a first halftone component screen with superior optical quality in a first lower gray scale range;generating a second image component from the same gray scale image received, by using a second cluster dot screening pattern, said second image component being a second halftone component screen with superior optical quality in a second higher gray scale range;limiting said first and second image components from respective gray scale values of unacceptable optical quality; andcombining said first and second image components to produce an output image over the entire gray scale, where the value of each component at each gray level is compensated thereby limiting the composite combination to the original gray tone value received at each point.