Color/black and white decision manner and the image reader and the image formation device of the manuscript, from supplier

摘要

PPROBLEM TO BE SOLVED: To mount a conventional ACS function, used in office color multi-function peripheries, on low price machines by reducing cost and size, and to provide a ACS function practical for many users. PSOLUTION: In an image reading apparatus having a still original reading mode of reading an image of an original on a platen table and a conveyance reading mode of reading an image of an original while conveying the original from a supply side to a discharge side. In the conveyance reading mode, it is determined whether the original is a color original or a monochrome original based on a line having continuous color saturation in a sub-scanning direction. A line is detected having a second threshold and more of pixel groups in which the number of pixels having continuous color saturation in a main scanning direction is not less than a first threshold, it is determined that the original is the color original when the number of the color lines having the second threshold and more of the pixel groups continuously in the sub-scanning direction is not less than a third threshold. PCOPYRIGHT: (C)2009,JPO&INPIT