Image inspection apparatus and image forming system

An image inspection apparatus comprising:

• a storage that stores output image data used in forming an image on a paper sheet;
• a conveyor that conveys the paper sheet on which the image is formed;
• a reader that reads the image formed on the paper sheet during conveyance being performed by the conveyor, and generates read image data;
• a determiner that compares pixels in the read image data with corresponding pixels in the output image data, and determines whether the read image data matches the output image data;
• a circulator that circulates the paper sheet from which the image has been read by the reader, and returns the paper sheet to the reader;
• and
• a controller that controls the circulator to circulate the paper sheet and return the paper sheet to the reader when a mismatch is detected by the determiner,
• wherein
• the reader generates circulated read image data when the paper sheet is circulated and conveyed to the reader,
• when a match is detected as a result of comparison between the read image data and the output image data, the determiner determines that the image formed on the paper sheet is normal,
• when a match is detected as a result of comparison between the circulated read image data and the output image data, the determiner determines that the image formed on the paper sheet is normal, and
• when a mismatch is detected as a result of comparison between the circulated read image data and the output image data, the determiner determines that the image formed on the paper sheet is abnormal.