1. An image processing apparatus comprising: a storage portion that stores, therein, edge position data indicating a position of a first edge image, the first edge image representing a first edge area of a first object image, the first object image representing an object contained in a first image; a determination portion that detects, based on the edge position data and a specific scaling factor which is greater than 1, a second edge image representing a second edge area having a width equal to a width of the first edge area from an outer periphery of an edge area of a second object image, the second object image representing the object contained in a second image, the second image being an image obtained by modifying a size or a resolution of the first image by increasing a number of pixels by the specific scaling factor; and an edge removal portion that performs a process for deleting an edge of an inner area that is a part other than the second edge image of the edge area of the second object image.