Patent ID: 8149471
Filing Date: 2012-04-03
Classification: H04N

Abstract:
1. An image reading apparatus comprising: a plurality of reading units that include a first reading unit and a second reading unit, that read a read object, output a result of reading as read data including a plurality of pixels, and respectively operate at different timings; a noise calculation unit that acquires first read data as a result of reading of a first read object as the read object by the plurality of reading units, acquires an operation state of the plurality of reading units during the reading of the first read object, and calculates, based on the operation state and the first read data obtained in the operation state, noise information based on the operation state, the operation state is one of a first state in which the first reading unit and the second reading unit simultaneously perform reading, and a second state in which only the first reading unit performs reading; and a noise removal unit that acquires second read data as a result of reading of a second read object as the read object different from the first read object by the plurality of reading units, and removes noise from the second read data based on the noise information calculated by the noise calculation unit, that acquires first state data as the first read data obtained by the first reading unit in the first state and second state data as the first read data obtained by the first reading unit in the second state, and calculates the noise in the first state data based on a difference between the first state data and the second state data to obtain the reference noise.