Importance

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Abstract

There is provided an image reading apparatus wherein prior to fine scan of an original image using a line CCD sensor at high resolution, a single prescan at low resolution is performed on the scanning lines of the original image using at least two different storage times of the line CCD sensor, in order to determine the reading conditions for the fine scan at the high resolution and the conditions for correction the fine scanned image date. Irrespective of the density of a particular frame image, a single prescan suffices for detecting maximum and minimum densities as well as high-density and medium-to low density image data of appropriate precision in an appropriate and positive way. Then, image information for acquiring not only optimal reading conditions for fine scan that are associated with the density and other characteristics of the original image, but also the conditions as for correcting the captured image data processing conditions can be obtained.

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First Claim