IMAGE READING APPARATUS

摘要

An image reading apparatus includes: a sensor module which includes a light source and sensors; a reference member for creating black correction data and white correction data; and an image processor. The image processor corrects uneven density of an image resulting from interference of image signals from the sensors, by performing, on the image signals obtained by the sensors, shading correction using black correction data and white correction data. The image processor obtains causes the sensors to obtain image signals of the reference member, and creates the white correction data based on white data, and the black correction data based on intermediate data. At least one of when creating the white correction data and when creating the black correction data, the image processor causes the sensors to obtain image signals of the reference member a plurality of times.

主权项

1. An image reading apparatus which reads an image on an object, the image reading apparatus comprising:
a sensor module which includes a light source which irradiates the object with light, and sensors which read reflected light of the light with which the object is irradiated to obtain image signals; a data creator which creates black correction data to be used as a black reference in shading correction and white correction data to be used as a white reference in the shading correction; a reference member for creating the black correction data and the white correction data, the reference member extending in a main-scanning direction predetermined; and a corrector which corrects uneven density of an image resulting from interference of the image signals from the sensors, by performing, on the image signals obtained by the sensors, the shading correction using the black correction data and the white correction data, wherein the sensors are disposed in the main-scanning direction, and configured such that the image signals obtained by the sensors form a one-line image signal in the main-scanning direction, the data creator is configured to obtain white data by causing the sensors to obtain image signals of the reference member, and create the white correction data based on the white data, the data creator is configured to obtain intermediate data which has a level of shade lighter than a level of shade of the black reference and darker than a level of shade of the white reference by causing the sensors to obtain image signals of the reference member, and create the black correction data based on the intermediate data, and at least one of when creating the white correction data and when creating the black correction data, the data creator causes the sensors to obtain image signals of the reference member a plurality of times.