Patent ID: 7873230

Claim:
An image input apparatus comprising: a photoelectric conversion device, which includes a first sensor and a second sensor, is configured to convert an image of an original, the first sensor including a plurality of color line sensors and the second sensor including a monochrome line sensor; an image region discrimination unit, which is configured to discriminate a no color image region with output signals from the first sensor, and to output a discrimination result; a substitution process unit which is configured to substitute the output signals from the first sensor with an output signal from the second sensor based on the discrimination result; and a correction unit which is configured to correct the output signals from the plurality of line sensors of the first line sensor of the photoelectric conversion device, on the basis of the discrimination information from the image region discrimination unit, with reference to an output signal from the second line sensor of the photoelectric conversion device and configured to correct a black character substitution process for each of the output signals from the plural line sensors of the first line sensor of the photoelectric conversion device, using the output signal from the second line sensor on the basis of the discrimination result from the image region discrimination unit.