Patent ID: 7336846

Claim:
An image input apparatus comprising: means, including a first line sensor and a second line sensor, for converting an image of an original, the first line sensor being composed of a plurality of line sensors having different color filters on light receiving surfaces thereof and the second line sensor having no color filter on a light receiving surface thereof; means for discriminating an image region of each of output signals from the plurality of line sensors that constitute the first line sensor, and for outputting discrimination information; and means for correcting the output signals from the plurality of line sensors of the first line sensor of the converting means, on the basis of the discrimination information from the discriminating means, with reference to an output signal from the second line sensor of the converting means, wherein the correcting means performs correction by executing a black character substitution process for each of the output signals from the plurality of line sensors of the first line sensor, on the basis of the discrimination information from the discriminating means with reference to the output signal from the second line sensor.