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Measuring Inter-image Distances

We could simply take 9#9 as the Euclidean distance between images. This measure is, however, extremely sensitive to small misalignments, so we also investigated the use of shuffle difference images as defined in the diagram below.

3#3 = 15#15

The shuffle differences between two images are shown below, for different sizes of the shuffle neighbourhood 16#16. The shuffle distance between two images is 17#17.

3#3 = 18#18