IMAGE PROCESSING APPARATUS, IMAGE PROCESSING METHOD, AND STORAGE MEDIUM

摘要

An image processing apparatus that generates a halftone image to be used in a case where an image is formed on a printing medium by exposing a photoreceptor by intensity modulation of a light beam, having a multivalued dither processing unit configured to generate N-nary (N≧3) image from an input image by a dither method, a determination unit configured to determine whether a difference in pixel value between pixels adjacent to each other in an exposure scanning direction exceeds a predetermined limit value for each pixel of the N-nary image generated by the multivalued dither processing unit, and a correction unit configured to correct the pixel values of the adjacent pixels whose difference in pixel value has been determined to exceed the predetermined limit value so that the difference does not exceed the limit value.

主权项

1. An image processing apparatus that generates a halftone image to be used in a case where an image is formed on a printing medium by exposing a photoreceptor by intensity modulation of a light beam, the apparatus comprising:
a multivalued dither processing unit configured to generate N-nary (N≧3) image from an input image by a dither method; a determination unit configured to determine whether a difference in pixel value between pixels adjacent to each other in an exposure scanning direction exceeds a predetermined limit value for each pixel of the N-nary image generated by the multivalued dither processing unit; and a correction unit configured to correct the pixel values of the adjacent pixels whose difference in pixel value has been determined to exceed the predetermined limit value so that the difference does not exceed the limit value.