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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. 3.

Fig. 3

Left: histogram bins by evenly-spaced spherical coordinates. Right: Icosahedral histograms. The yellow tile is intersected by the gradient vector, shown in black.