Fig. 4

Fourier Primal-Dual UNet (Fourier-PDUNet): The primal and dual iterates are represented by orange and green boxes, respectively. A complex-valued UNet architecture, as opposed to a complex-valued fully convolutional network (as used in Fourier-PDNet), is used in the primal block. The original primal-dual network is still present in the dual block, which is a complex-valued fully convolutional network.