| 摘要 |
An image-scanning apparatus for scanning an original in an image-reading area to output image data, includes, a platen on which the original is placed, a reference plate which has a reference color, and a scanning device for optically scanning the reference plate and the original placed on the platen to provide a first optical image and a second optical image. The image-scanning apparatus also has a receiving device for receiving the first optical image and the second optical image so as to output electrical signals, a setting device for setting a correcting amount on the basis of the electrical signals, a correcting device for correcting the scattering of the electrical signals to output the image data, a calculating device for calculating a pre-running length corresponding to a predetermined speed, the scanning device is accelerated in a pre-running portion corresponding to the pre-running length so that the scanning device reaches the predetermined speed, a determining device for determining that the reference plate is sufficiently included in the pre-running portion, a control system for controlling the scanning device and the setting device corresponding to the detecting operation of the determining device so that the scanning device performs the scanning operation efficiently.
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