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. Author manuscript; available in PMC: 2022 Oct 19.
Published in final edited form as: Proc SPIE Int Soc Opt Eng. 2021 Feb 15;11599:115990H. doi: 10.1117/12.2581076

Figure 5.

Figure 5.

A, C, and E are the basis images for the S-DOG channels in the spatial domain, B, D, and F are the basis images in the frequency domain. The zero frequency is empty because the human eye is unable to see the zero frequency.