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4.1 Points and patches                                                                 187

































                                                            (a)


























                              (b)                           (c)                          (d)

               Figure 4.5 Three auto-correlation surfaces E AC (Δu) shown as both grayscale images and surface plots: (a) The
               original image is marked with three red crosses to denote where the auto-correlation surfaces were computed; (b)
               this patch is from the flower bed (good unique minimum); (c) this patch is from the roof edge (one-dimensional
               aperture problem); and (d) this patch is from the cloud (no good peak). Each grid point in figures b–d is one value
               of Δu.
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