| 摘要 |
An original document image is irradiated with light emitted from a light source, and light reflected from or passed through the original document image is applied to a line sensor for reading the image. A maximum output value of the line sensor is determined within a linear characteristic region thereof with respect to the amount of exposure of the line sensor to the light reflected from or passed through the original document image. The amount of light emitted from the light source is regulated within the maximum output value to determine a sensitivity correcting value for the line sensor with respect to a reference object, and the sensitivity correcting value is stored as corrective data. An image signal from the line sensor is corrected with the corrective data when the original document image is read.
|
