1. A method for estimating a displacement of a second image acquired by a sensing device relative to a first image acquired by the sensing device, the method comprising: determining a set of correlation function value points indicative of a correlation function extremum, each correlation function value point based at least partially on a pattern of image values included in both the first image and the second image, each correlation function value point further based on a respective known spatial translation of the image values in the second image relative to the image values in the first image; and estimating at least one spatial translation position corresponding to at least one symmetry point which is not the correlation function extremum, based on a plurality of correlation function value points bounding the correlation function extremum, the at least one spatial translation position corresponding to the at least one symmetry point indicative of the displacement of the second image relative to the first image.