| 摘要 |
An image reading apparatus includes: a light source that irradiates a document sheet with light; a light receiving unit that receives reflected light from the document sheet; and a color determination unit that performs color determination as to whether an image of the document sheet is any one of a monochrome image and a color image. The color determination unit performs the color determination as to whether the image of the document sheet is any one of a monochrome image and a color image by comparing chroma information of the image of the document sheet read by the light receiving unit with a threshold calculated from chroma information obtained by reading an image having a predetermined chroma. |
