In an image processing apparatus, an antenna is arranged in a traveling member of a scanner, a reader/writer receives a radio wave from a radio tag added to an original via the antenna when the reader/writer reads an image from the original, a demodulation circuit generates a demodulated signal, a radio tag identification number identifying and judging unit, which has received the demodulated signal, identifies a type of the radio tag, and when it is judged that the original is a forgery prevention object original, a forgery prevention processing unit applies forgery prevention processing to the original.