Extended scene coarse phasing simulation results of JWST-like segmented imaging system. (a). Initial state. The initial degraded image and loaded piston distribution are respectively shown in (a1) and (a2), differential MTF and extracted heights of peak are shown in (a3) and (a4). The degraded MTF is illustrated in (a5). (b). Corrected results. The corrected image, differential MTF, extracted heights of peak and the corrected MTF are respectively shown in (b1), (b3), (b4), and (b5). (b2) residual piston after coarse phasing with average wavefront RMS of 124 nm.