Patent ID: 8804208
Filing Date: 2014-08-12
Classification: H04N

Abstract:
1. An image reading apparatus for reading document images having different gloss levels, comprising: a platen setting a document image; a regular reflection light source for photoelectric conversion of substantially regular reflection light from the document image; a diffuse light source for photoelectric conversion of substantially diffuse reflection light from the document image; a photoelectric conversion means photoelectrically converting reflection light from the document image on the platen; a control means executing regular reflection reading of the document image irradiated with light from the regular reflection light source, and diffuse reflection reading of the document image irradiated with light from the diffuse light source; and a data processing means generating image data based on each output value of regular reflection and diffuse reflection from the photoelectric conversion means; wherein the data processing means obtains, based on: a regular reflection correction value for correcting a regular reflection output value from the photoelectric conversion means; a diffuse correction value for correcting a diffuse reflection output value from the photoelectric conversion means; and a determining threshold for determining whether or not the regular reflection output value is a gloss pixel; gloss pixel data based on the regular reflection correction value after comparing the regular reflection output value from the document image with the determining threshold; and non-gloss pixel data based on the diffuse correction value for the diffuse reflection output value of the document image.