| 摘要 |
<P>PROBLEM TO BE SOLVED: To exactly perform droplet-impact correction even if variation with time arises in droplet-impact. <P>SOLUTION: The image-forming apparatus comprises a head 50 having a plurality of nozzles, an image reading section 122 that reads an image on a medium 16, a deviation amount calculation section 124 that calculates the present deviation amount of each nozzle by the weighted mean of the deviation amounts of the latest N times calculated on the basis of past read image data and the initial deviation amount, and a droplet-impact correction section 126 that performs droplet-impact correction of each nozzle on the basis of the present deviation amount. The deviation amount in a period when the variation of the deviation amount with time exceeds the allowable maximum value is preferably eliminated and not used for droplet-impact correction. The deviation amount used for droplet-impact correction may be switched on the basis of the difference in the deviation amount of the droplet-impact measured before and after the maintenance operation of a maintenance section 102. Generally, the deviation amount of the droplet-impact is measured by a high-speed measurement mode to correct droplet-impact. On the other hand, in a specific case, the droplet-impact correction may be performed based on the deviation amount measured by a high precision measurement mode. <P>COPYRIGHT: (C)2008,JPO&INPIT |
