Disclosed herein is an image correction method for a camera system, which minimizes the amount of data that must be stored by a camera system and which can conveniently correct mounting errors of cameras. In the image correction method for a camera system, image data about a reference ground, which is captured by a camera and on which at least one ground mark is indicated, is acquired. Coordinates of a captured ground mark are obtained based on the image data. A preset Look-Up Table (LUT) is corrected using errors between the coordinates of the captured ground mark and coordinates of a preset reference mark. The ground mark and the reference mark may respectively have four or more corresponding correction points.