1. An image processing apparatus comprising: a storage that stores, therein, edge position data indicating a position of a first edge image, the first edge image representing a first edge of a first object image, the first object image representing an object contained in a first image; a determination portion that detects a second edge image based on the edge position data and a specific scaling factor, the second edge image representing a second edge 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 α times corresponding to the specific scaling factor where α is greater than 1, the second edge having a width equal to a width of the first edge; and a removal portion that performs a process for deleting an edge of an inner area that is surrounded by the second edge image.