To detect with high accuracy a particular pattern hardly disturbing eyesight by identifying a pixel where paper fiber cannot be identified, as a particular pattern pixel on the basis of an result of an of paper fiber from a particular color pixels. An image processing apparatus according to an embodiment of the present invention includes a paper fiber identification unit configured to identify paper fiber from an original read signal, a particular color pixel identification unit configured to identify a particular color pixel from the original read signal, a particular pattern detection unit configured to identify a pixel where paper fiber cannot be identified, as a particular pattern pixel on the basis of an identification result of the paper fiber identification unit from the particular color pixel, and a control unit configured to control the image processing apparatus in accordance with a result of the particular pattern detection unit.