Patent ID: 7170639
Filing Date: 2007-01-30
Classification: H04N

Abstract:
1. A printer system, comprising: a scanner for scanning an input image; a memory, coupled to the scanner, for storing a scanned image; a halftoning processor, coupled to the memory, for processing the scanned image in the memory according to a halftone threshold matrix, the halftoning processor deciding on a level for a pel depending upon the halftone threshold matrix and the scanned image and generating an output based upon the decision, the halftone threshold matrix comprising a supercell divided into a plurality of subcells, the plurality of subcells comprising at least a first group of N×M subcells having a first line frequency and a separate and distinct second group of A×B subcells having a second line frequency, wherein a size of the first and second group of subcells are not equal, and wherein more than one pixel in a first subcell is turned on before a next pixel in a second cell is turned on; and a printer for receiving the output of the halftone processor and generating a printout in response thereto.