Patent ID: 7751088
Filing Date: 2010-07-06
Classification: H04N

Abstract:
1. A method for generating a dither matrix to print on a print medium, comprising: setting an evaluation function for calculating an evaluation value of the dither matrix; providing a dither matrix as an initial state which stores in respective elements each of a plurality of threshold values for deciding presence or absence of dot formation for each pixel according to an input tone value; fixing an element for storing a threshold value in an increasing order from a smaller threshold value while transposing at least one of the plurality of threshold values stored in a part of the elements and a threshold value stored in another part of the elements; and outputting a dither matrix in which elements for storing are fixed with regard to at least part of the plurality of threshold values, wherein the step of fixing an element for storing a threshold value comprises: wherein each operation of the method for generating the dither matrix is executed by a processor.