US Patent 7262879 Method for screening of halftone images

A method of making second generation halftone images lacking visible interference, includes selecting an image which has been halftoned, and determining the number of tone levels required for each pixel of the halftoned image, A halftone cell size is identified, and a dot growth pattern is arranged to offset initial dot growth from the center of the halftone cell by defining sub-cells and growing the dot pattern relative to the sub-cell, A dot pattern in a second generation halftone of the selected image is grown.