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The difference between application of the 2D SA-DCT along coronal slices of a 3D image, and application of the genuine 3D SA-DCT algorithm. Upper left panel: the original true image. Upper right panel: the noisy image (zero mean, σ2 = 0.07). Lower right panel: result after application of the quasi-3D algorithm along the z-direction. Lower left panel: result after application of the full 3D algorithm proposed in this paper. See also detail in Figure 4.
