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. Author manuscript; available in PMC: 2020 Oct 1.
Published in final edited form as: Med Image Anal. 2019 Jun 22;57:44–55. doi: 10.1016/j.media.2019.06.010

Figure 2: Downsampling in x-Space.

Figure 2:

LR image generated by (i) Extracting the low-frequency component (red rectangle) of the frequency spectrum of the HR image, and (ii) Filtering with a Tukey window.