| 摘要 |
PROBLEM TO BE SOLVED: To provide an image processing apparatus capable of preventing extension of width of a line to correct banding, and to provide a method for the image processing apparatus. SOLUTION: A phase data generating section 105 generates phase data representing a pattern which indicates a growing direction of a dot on the line and in which the growing direction changes for every predetermined number of lines. A correction coefficient generating section 107 sets correction coefficients, to be used to distribute a value of a pixel of interest to a pixel adjacent to the pixel of interest in a sub-scanning direction, by the number of lines corresponding to a cycle of sub-scanning direction positional shift of an image formed by the image forming apparatus. An edge determining section 103 detects an edge section of the image represented by input image data. A position correcting section 102 distributes the value of the pixel of interest of the input image data to a pixel adjacent to the pixel of interest according to the correction coefficients. Selectors 104 and 108 select the image data, which the position correcting section 102 outputs, and the phase data, which is generated by the phase data generating section 105, at the edge section of the image, and select the input image data and the phase data to be supplied with the input image data, at a non-edge section of the image. A PWM circuit 106 generates an image signal pulse-width modulated in accordance with the selected image data and phase data. COPYRIGHT: (C)2011,JPO&INPIT |
