Methods and systems for image registration are described. An area of an image may be selected. A length of at least one encoded wavelength for the area may be accessed. One or more candidate wavelengths may be identified in the area in at least one direction that includes at least one large peak. The length of the at least one encoded wavelength may be compared to the length of at least one of the one or more candidate wavelengths to calculate an alteration ratio. The alteration ratio may identify at least one of a scale or a rotation of the image.