An image processing device includes an artificial image determining unit configured to determine whether a pixel is in an artificial image by using two or more different determination criteria or conditions based on an input image signal, where the determination criteria include any one or more of a first determination criterion for determining whether the pixel is part of an artificial image by determining whether a predetermined area including the pixel represents a flat area, a second determination criterion for determining whether the pixel is part of an artificial image by determining whether the predetermined area represents a gradation area, or a third determination criterion for determining whether the pixel is part of an artificial image by determining whether the predetermined area represents a color change area.