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. Author manuscript; available in PMC: 2020 Mar 1.
Published in final edited form as: IEEE Trans Comput Imaging. 2018 Nov 9;5(1):52–67. doi: 10.1109/TCI.2018.2880326

Fig. 1.

Fig. 1.

RED cost Cred(xk) and fixed-point error ∥A⊤(Axk – y)/σ2 + λ(xk – f(xk))∥2 versus iteration k for {xk}k=1K produced by the RED-SD algorithm from [1]. Although the fixed-point condition is asymptotically satisfied, the RED cost does not decrease with k.