Image processing apparatus resolving dust problem

摘要

An image processing apparatus includes a reading device stationed at a reading position. The reading device includes a light source that emits a reading light to an original document passing through the reading position. A photoelectric conversion element is provided to convert the reading light reflected from the original document into image data. A shading correction function is provided to apply shading correction to the image data in accordance with reference data obtained from a reference white plate. A memory is provided to store at least a line of the image data. A dust position specifying device is provided to specify a position of dust by detecting presence of dust at predetermined positions on a light path extending from the light source to the photoelectric conversion element in accordance with the image data. A counting device is provided to count a number of appearance times of the dust per each of the predetermined positions. An appearance transition device is provided to store appearance transition data of the dust per each of the predetermined positions.