Patent ID: 8842344
Filing Date: 2014-09-23
Classification: G07D,H04N

Abstract:
1. An image sensor unit, comprising: a light source; a light guide that guides light from the light source and linearly emits light to a subject to be illuminated; an image-forming element that forms an image of light from the illuminated subject on a photoelectric conversion element to generate image data; a memory circuit that stores reference data to be a reference illuminance of an image region across the illuminated subject; a white reference provided at positions that are at opposite ends of the image-forming element in a longitudinal direction and cover respective areas external to the image region across the illuminated subject; a white reference data generation circuit that reads light reflected from the white reference means by the photoelectric conversion element and for generating white reference data that represents a white reference illuminance; a correction data generation circuit that generates correction data that represents a white reference illuminance of the image region across the illuminated subject on the basis of the white reference data; a comparison circuit that calculates a correction coefficient from the correction data and the reference data; and a correction circuit that corrects the image data on the basis of the correction coefficient, wherein the light guide is made of a material having a region in which transmittance is not constant with respect to wavelength, and wherein the light source includes at least one of light emission wavelengths in the region of the light guide in which transmittance is not constant and light emission wavelengths in proximity to the region in which transmittance is not constant.