Patent ID: 8368961
Filing Date: 2013-02-05
Classification: H04N

Abstract:
1. An image processing device comprising: a storing unit that stores a single set of line dither matrices, the single set of line dither matrices including a first line dither matrix for first color, a second line dither matrix for second color, and a third line dither matrix for third color, each of the first line dither matrix, the second line dither matrix, and the third line dither matrix including threshold values that are arranged to make halftone dots grow linearly and including a plurality of n×n sub-matrices, n being set to an integer greater than 1, the first dither matrix having a first screen angle, the second dither matrix having a second screen angle that is different from the first screen angle, the third dither matrix having a third screen angle that is different from the first screen angle and the second screen angle; and a controller configured to operate as: a creating unit that is configured to create binary image data based on input image data using the single set of line dither matrices, wherein a difference between the first screen angle and the second screen angle is set to either one of (π/2−arctan(1/n)) radians and (π/2+arctan(1/n)) radians, and wherein a difference between the first screen angle and the third screen angle is set to either one of (π/2−arctan(1/n)) radians and (π/2+arctan(1/n)) radians.