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Figure 10
Left: comparison of sinograms after different denoising procedures on the Shepp–Logan phantom with noise as in (14)[link] with [{\rm{std}}(\eta_{{}_{{\rm{P}}}})] = 0.02 and signal peak 2560. Top to bottom: [Y = \ln[A+\pi/(1+\eta_{{}_{{\rm{P}}}})]]; Z; Münch et al. (2009BB1)BB20; Vo et al. (2018BB1)BB26; proposed procedure based on BM3D denoising. Right: corresponding estimation errors. Note how both of the comparison methods create strong artifacts around the areas with the highest contrast, as pointed by the arrows. These artifacts are not present in either the noisy image Z or the BM3D-based estimate.

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