| 摘要 |
An imaging unit including a line sensor reads a film image to produce color decomposition data by scanning a plurality of lines on the film image in a stepped prescanning operation. During the prescanning operation, the color decomposition data of a plurality of pixels at each of a plurality of sampling points are sampled and added up on a line-by-line basis, and the added color decomposition data are averaged, where corrections including a shading correction are performed concurrently with the adding and averaging operations. During a period of from the end of the prescanning operation to the start of a main scanning operation, on the basis of the averaged color decomposition data, a density correction amount is determined and parameters to be used for correcting the film image in a succeeding actual image processing operation are calculated. The calculated parameters are set in a line memory.
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