Patent ID: 7349128
Filing Date: 2008-03-25
Classification: H04N

Abstract:
1. An image scanner, comprising: plural image sensors including color image sensors to detect optical color image data and a monochromatic image sensor to detect optical monochromatic image data by applying light from a light source to a document and output electric signals; amplifiers to amplify the outputs of plural image sensors; and a peak detection processing portion to set gain values of the amplifiers for the plural image sensors by detecting a peak value of sensitivity of each of the plural image sensors, wherein the output signals from the color image sensors and the output signal from the monochromatic image sensor are switched between the color image sensors and the monochromatic image sensor and the amplifiers amplify the output signals of the color image sensors when the color image sensors are switched from the monochromatic sensor and the amplifier amplifies the output signal of the monochromatic image sensor when the monochromatic image sensor is switched from the color image sensors.