Patent ID: 7701623
Filing Date: 2010-04-20
Classification: H04N

Abstract:
1. An image reading device, comprising: a first light source that irradiates light on a first side of an object; a second light source that irradiates light on a second side of the object, the second light source including a plurality of light emitting devices, the plurality of light emitting devices being grouped into a plurality of groups, each of the plurality of groups corresponding to a peak wavelength of light, the intensity of the light from the light emitting devices being controllable; a memory that stores a plurality of parameters for controlling an intensity of the light emitting devices, each of the plurality of parameters corresponding to one of the plurality of groups; a controller that controls an intensity of the light emitting devices in response to one of the plurality of parameters stored in the memory; a first image reading unit that reads reflected light from the first side and generates monochrome image data on the basis of the read reflected light; a second image reading unit that reads reflected light from the second side and generates monochrome image data on the basis of the read reflected light; and a user interface that receives an instruction to indicate a color, wherein the parameters are determined so that difference in density is smaller than a predetermined threshold, the difference in density being defined as a difference between a density of monochrome image generated by the first image reading unit and a density of monochrome image generated by the second image reading unit when the first image reading unit and the second image reading unit read pixels having the same tone, wherein each of the plurality of parameters corresponds to a range of the tone, and wherein the controller is configured to read a parameter corresponding to a tone showing the color that is indicated by the instruction received by the user interface, and is configured to control the intensity of the light emitting device in response to the read parameter.