Patent ID: 8472082

Claim:
An image processing device comprising: a storing unit that stores a dither matrix, the dither matrix having a plurality of dot regions and having a threshold value at each of the dot regions, the plurality of dot regions being divided into a plurality of sub-matrices arranged within the dither matrix; and a creating unit that is configured to create binary image data by comparing an input value to the threshold values, wherein the plurality of sub-matrices include a first sub-matrix and a second sub-matrix, the first sub-matrix having a first threshold value smallest among threshold values in the first sub-matrix, the second sub-matrix having a plurality of threshold values that are smaller than the first threshold value and are arranged adjacent to each other, each of all remaining sub-matrices having at least one threshold value smaller than the first threshold value, and wherein the plurality of sub-matrices include a third sub-matrix and a fourth sub-matrix, the third sub-matrix having a second threshold value largest among threshold values in the third sub-matrix, the fourth sub-matrix having a plurality of threshold values that are larger than the second threshold value and are arranged adjacent to each other, each of all remaining sub-matrices having at least one threshold value larger than the second threshold value.