Patent ID: 6084983
Filing Date: 2000-07-04
Classification: H04N

Abstract:
An image reading device in which an image, recorded on a color negative film, is read by an optical sensor with a relatively coarse pitch according to a first reading mode, and then said image is read by said optical sensor with a relatively fine pitch according to a second reading mode, said device comprising:a white level correction coefficient calculation processor that calculates a white level correction coefficient, used when performing a shading correction, for each pixel data outputted from said optical sensor, said white level correction coefficient being calculated prior to a reading operation according to said first reading mode;a color correction coefficient calculation processor that calculates a color correction coefficient, used when performing a color correction on said image, based on a result of an exposure measurement carried out prior to said reading operation according to said first reading mode;a combined correction coefficient calculation processor that calculates a product of said white level correction coefficient and said color correction coefficient to obtain a combined correction coefficient for said each pixel data; anda combined correction processor that multiplies unprocessed pixel data of said image, obtained by reading operations of said first and second reading modes, by said combined correction coefficient, so that said shading correction and said color correction are performed simultaneously as a combined correction.