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. Author manuscript; available in PMC: 2018 Oct 1.
Published in final edited form as: IEEE Trans Image Process. 2017 Jul 3;26(10):4900–4910. doi: 10.1109/TIP.2017.2722689

Fig. 1.

Fig. 1

Visualization of the ℓ1 (left) and ℓ∞ (right) neighborhoods in ℤ2. In our experiments, defining extrema with the ℓ1 neighborhood improves registration results.