Patent ID: 6456748
Filing Date: 2002-09-24
Classification: H04N

Abstract:
An image reading system comprising:a) plural light sources of mutually different light emission wavelengths; b) an image reading unit adapted to read an image illuminated by said plural light sources, thereby outputting image signals; c) a switching controller adapted to switch between a first mode and a second mode; d) a read-out controller adapted to control read out of the image signals from said image reading unit, wherein the read out of the image signals in the first mode occurs at a predetermined reading period and the read out of the images signals in the second mode occurs within the same predetermined reading period; and e) a lighting controller adapted to sequentially turn on said plural light sources in the first mode and the second mode, wherein the sequence in the first mode is the same as the sequence in the second mode, and wherein at least one of said plural light sources is turned on with lower luminance in the second mode than in the first mode.