Image processing system, non-transitory computer readable medium, and image processing method

Abstract

An image processing system includes: a processor configured to: determine, for each of predetermined areas, whether a black spot corresponding to a pixel with density greater than or equal to specified density is included in image data generated by reading a received document sheet; make a count of the black spot for each predetermined area; recognize, as a specific area, an area that is one of the predetermined areas and that includes a black spot a count of which is greater than or equal to a first threshold; recognize, as a different area relevant to the specific area, an area that is located at a position a predetermined length away from the specific area and that is located parallel or perpendicular to a scanning direction of the image data, the area including a black spot a count of which is greater than or equal to the first threshold; calculate a sum total of the count of the black spot for the document sheet and determine whether a derived count derived from subtraction from the sum total is less than or equal to a specified value, the subtraction being performed by subtracting, from the sum total, a sum total of the count of the black spot in the specific area, the count of the black spot in the different area, and a count of black spots in respective areas neighboring the specific area and the different area; and detect, as image data regarding a blank document sheet, image data regarding a document sheet with the derived count less than or equal to the specified value.