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Abstract

An apparatus and a method of reading an image wherein processing conditions can be set up based on image data obtained by scanning image information recorded on an original to be read. The entire image reading region of a reading device with the original held therein is scanned to produce scanned data including the image data. A separator circuit compares the scanned data with given threshold data to separate the scanned data into first scanned data from the original and second scanned data from portions other than the original. An adder adds together either the number of pixels read from the first scanned data or the number of pixels read from the second scanned data along a main scanning direction for each given pitch extending in an auxiliary scanning direction, whereas another adder adds together either the number of pixels from the first scanned data or the number of pixels from the second scanned data along the main scanning direction for each given pitch extending in the main scanning direction. Each of first and second region setting-up circuits compares, for each given pitch, the number of the pixels added together along each of the main and auxiliary scanning directions with a given number of threshold pixels so as to determine an image reading region of the original, which extends in each of the main and auxiliary scanning directions.

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