| 摘要 |
An image reading apparatus having a memory to store therein image data acquired by reading an original is provided. In a regular reading mode, the memory is divided into a first buffer that stores therein first image data of an image of a first side of the original and a second buffer that stores therein second image data of an image of a second side of the original. In a ring buffer mode, only the first image data is stored in the first buffer and the second buffer in a seamless manner, and the first image data stored in the buffers is output from the buffers to an image processing unit through an output path in a parallel manner. When a size of an original to be read is larger than a predetermined size, reading is performed in the ring buffer mode.
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