A new technique to derive features for shift and unequally scaled images

This paper presents a technique to derive features for images that are shifted and unequally scaled. The problem is formulated using conventional regular moments. It is shown that the conventional regular moment-invariants remain no longer invariant when the image is scaled unequally in the x- and y-directions. A method is proposed to form moment-invariants that do not change under such unequal scaling. Computer simulation results are also included to show the validity of the method proposed.