Patent ID: 9092720
Filing Date: 2015-07-28
Classification: B41J,G06K

Abstract:
1. A dither pattern generation method for generating plural dither patterns that include a first dither pattern and a second dither pattern in which threshold values 1 to MAX are arranged, comprising: an initial dot pattern generation process of generating an initial dot pattern in which 2×S×N (S and N are integers that satisfy 1≦S<MAX, and 1≦N) dots are arranged in a specified dither pattern area so as to have a blue noise characteristic; a distributing process of distributing the 2×S×N dots that are arranged in the initial dot pattern into a first dot pattern and a second dot pattern so that the first dot pattern and the second dot pattern both have a blue noise characteristic; a process of generating the first dither pattern by setting each of threshold values 1 to S for every N pixels that are correlated with the first dot pattern so that threshold values having a high value are set for positions having a high dot concentration ratio in the initial dot pattern and the first dot pattern; and a process of generating the second dither pattern by setting each of threshold values 1 to S for every N pixels that are correlated with the second dot pattern so that threshold values having a high value are set for positions having a high dot concentration ratio in the initial dot pattern and the second dot pattern.