Image forming apparatus, color registration method of image forming apparatus, host apparatus, control method of host apparatus, and computer readable recording medium

摘要

A color registration method of an image forming apparatus, a control method of a host device, an image forming apparatus, a host apparatus, and a computer-readable recording medium are provided. The method includes printing a preset test pattern for color registration, scanning the printed test pattern for color registration, detecting the printed test pattern for color registration from a scan image obtained as a result of the scanning, calculating location error values of respective colors, using the detected test pattern for color registration, and performing the color registration using the calculated location error values of respective colors.

主权项

1. A color registration method of an image forming apparatus, comprising:
printing a preset test pattern for color registration on a printing paper; generating a scan image by scanning the printing paper on which is printed the preset test pattern for color registration; detecting the printed test pattern for color registration from the scan image; calculating location error values of respective colors, using the detected test pattern for color registration; and performing the color registration using the calculated location error values of respective colors, wherein the preset test pattern for color registration comprises a plurality of pairs of a first color line and combined lines of a second color line, a third color line, a fourth color line, a fifth color line, and a second color line in sequence, and the first color is one of cyan C, magenta M, yellow Y, and black K, and the second, third, fourth and fifth colors are different colors from each other with one of each of cyan C, magenta M, yellow Y and black K, wherein the detecting the printed test pattern for color registration comprises detecting the printed test pattern for color registration by detecting the first color line from the scan image, and the calculating comprises:
calculating median location values of respective color lines constituting the combined lines, andcalculating the location error values for respective colors using the calculated median location values of respective color lines, wherein the calculating the median location values of respective color lines constituting the combined lines comprises:
calculating location values of a first edge and a second edge of the respective color lines;calculating linear equations for the first and second edges, using the calculated location values of the first and second edges; and calculating the median location values based on middle locations of a distance between the calculated linear equations of the first and second edges.