Method and apparatus for processing images using black character substitution

Abstract

An image correction section in an image processing section performs a resolution-enhancing process for an input R signal from a RED photodiode array 9 R 1 , an input G signal from a GREEN photodiode array 9 G 1 and an input B signal from a BLUE photodiode array 9 B 1 , using an input K signal from a BLACK photodiode array 9 K 1 . The image correction section outputs four signals: an Rc 1 signal, a Gc 1 signal and a Bc 1 signal, which are subjected to the resolution-enhancing process, and the K signal that is used for the resolution-enhancing process.

1 . An image input apparatus that inputs an image of an original, comprising:
 photoelectric conversion means including a first line sensor and a second line sensor, 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; and   correction means for correcting output signals from the plural line sensors of the first line sensor of the photoelectric conversion means, using an output signal from the second line sensor of the photoelectric conversion means.