| 摘要 |
In an image scanner, an optical image is formed on a CCD image sensor through a lens unit from rays traveling through a picture frame placed in a film carrier, so image signals are picked up from the picture frame. The image signals are corrected with shading correction data that are read out from a memory in accordance with the magnification of the lens unit. The memory previously stores shading correction data for frequently used magnification steps. Shading correction data for less frequently used magnification are previously stored in a hard disc. If the lens unit is set at a magnification for which the memory does not store suitable shading correction data, the suitable shading correction data are read out from the hard disc, and written on the memory.
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