| 摘要 |
PROBLEM TO BE SOLVED: To optimally synthesize images by easily measuring deviation amount of an image in a sub-scanning direction at a reading joint of reading sensors in a short period of time, and highly accurately obtaining the delay amount of image data read by a first reading sensor in an upstream with respect to image data read by a second reading sensor in a downstream. SOLUTION: Respective differences are found which are calculated by causing the plurality of reading means to read an original document having a plurality of reference straight line patterns extending in a main scanning direction, and which are caused in such a way that a plurality of straight line images extending in a main scanning direction at a reading joint between a first reading means and a second reading means are displaced in a sub scanning direction. A value acquired by applying arithmetic mean to the differences is used as a mean value of the relative deviation amount. The mean value of the relative deviation value is determined as the delay amount of the image data read by the first reading means, and is set as a correction value for correcting the deviation value. The delay time of the first reading means in the compositing means is adjusted. COPYRIGHT: (C)2006,JPO&NCIPI
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