Patent ID: 7859723
Filing Date: 2010-12-28
Classification: H04N

Abstract:
1. An image processing apparatus for performing error diffusion processing on multi-valued image data comprised of plural color components including a first color component and a second color component, comprising: a generation unit configured to generate values of the first and second color components for a pixel of interest from multi-valued image data of the first and second color components representing the pixel of interest and multi-valued image data of the first and second color components error-diffused to the pixel of interest; a binarization unit configured to binarize the values of the first and second color components for the pixel of interest generated by said generation unit; and an image formation unit configured to form an image based on a result of the binarization, wherein said binarization unit binarizes the values of the first and second color components: (1) in a case where a sum of the values of the first and second color components is less than a predetermined threshold value, such that neither a dot of the first color component nor a dot of the second color component is formed by said image formation unit; (2) in a case where the sum of the values of the first and second color components is greater than the predetermined threshold value and one of the values of the first and second color components is equal to or less than the predetermined threshold value, such that only a dot of one of the first and second color components having a greater value than that of the other of the first and second color components is formed by said image formation unit; and (3) in a case where the sum of the values of the first and second color components is greater than the predetermined threshold value and both of the values of the first and second color components are greater than the predetermined threshold value, such that both dots of the first and second color components are formed by said image formation unit.