Time complexity (top-left: 64 × 64 spatial pixels; top-right: 128 × 128 spatial pixels; bottom-left: 256 × 256 spatial pixels; bottom-right: 512 × 512 spatial pixels). The time complexity is plotted for the different models. In green, we show just the MF reconstruction times per iteration. Light blue: duration for each iteration in the SF model before the transition. Dark blue: duration of the MF model iterations after the transition. The first dark blue marker also includes the transition time.