Patent ID: 7224483

Claim:
A method of controlling an image reading apparatus, which comprises an illumination unit adapted to irradiate an object with first and second light rays, wherein said first and second light rays are one of white light and one of infrared light, and a light-receiving unit adapted to receive light coming from the object, and to output a signal, and reads an image of the object by moving the illumination unit and light-receiving unit relative to the object, comprising: outputting from the light-receiving unit a first signal in response to irradiation with the first light ray, and a second signal in response to irradiation with the second light ray; and controlling to sequentially turn on the second light ray at a plurality of timings to sandwich an ON timing of the first light ray, and to obtain image signals for one line corresponding to the first and second light rays by averaging or adding respective pieces of image information obtained at the plurality of timings for each of the first and second signals, upon reading image information for one line by the image reading apparatus.