Patent ID: 7818652

Claim:
An image processing system including an image formation apparatus that error-correction codes original information at a predetermined error correction rate, produces a code image by imaging the original information that was subjected to the error correction coding, and forms the produced code image on a sheet, and an image processing apparatus equipped with extraction means for extracting the original information from the code image on the sheet that was obtained by reading the sheet with the code image formed thereon and transmission means for transmitting an error detection rate when the original information is extracted by the extraction means to the image formation apparatus wherein the image formation apparatus has: reception means for receiving the error detection rate from the image processing apparatus; first determination means for determining whether the received error detection rate is lower than a predetermined threshold in order to determine whether the original information has been successfully extracted from the code image; counting means for counting the number of times at each of which the first determination means determines that the error detection rate is not lower than the predetermined threshold; second determination means for determining whether the number of counts in the counting means is lower than the predetermined number of times; an error correction rate alteration means for, when the second determination means determines that the number of counts is not lower than the predetermined number of times, raising the predetermined error correction rate, and when the second determination means determines that the number of counts is lower than the predetermined number of times, not raising the predetermined error correction rate; and resetting means for, when the predetermined error correction rate is raised by the error correction rate alteration means, resetting the number of counts of the counting means; and the predetermined threshold is a value obtained by multiplying the error correction rate before alteration by a predetermined ratio.