IMAGE READING DEVICE

摘要

An image reading device includes an image processor that generates correction data to be used for shading correction and perform the shading correction using the correction data, and a memory that stores first black correction data to be used for the shading correction in a main scanning direction in a predetermined first position in a predetermined sub-scanning direction. The image processor generates third black data based on an image signal of a second reference plate extending in the sub-scanning direction in a predetermined second position in the main scanning direction, generates black correction data according to the sub-scanning direction based on the first black correction data and the third black data, and performs the shading correction using the black correction data so as to correct density unevenness in the main scanning direction and the sub-scanning direction caused by an interference between image signals from a plurality of sensors.

主权项

1. An image reading device that reads an image of an object, the image reading device comprising:
a sensor module including a light source that irradiates the object and a plurality of sensors that reads light reflected from the object to acquire image signals; a data generator that generates black correction data to be a black reference and white correction data to be a white reference that are used for shading correction; a storage that stores reference black correction data to be the black correction data to be used for the shading correction in a main scanning direction perpendicular to a predetermined sub-scanning direction in a predetermined first position in the sub-scanning direction, and a corrector that performs the shading correction on the image signals acquired by the plurality of sensors using the black correction data and the white correction data, wherein the plurality of sensors are disposed in the main scanning direction, and the image signals constitute an image signal on a line extending in the main scanning direction, the data generator
acquires second intermediate data that is the intermediate data that is lower in a density level than the black reference and is higher in a density level than the white reference based on an image signal of a second reference member extending in the sub-scanning direction in a predetermined second position in the main scanning direction, andgenerates the black correction data in each position in the sub-scanning direction based on the second intermediate data and the reference black correction data, andthe corrector performs the shading correction using the black correction data in each position in the sub-scanning direction so as to correct density unevenness of an image in the main scanning direction and the sub-scanning direction, the density unevenness being caused by an interference between the image signals from the plurality of sensors.