Neural network NRMSE PSNR (dB) SSIM Pix2Pix 0.0396 ± 0.0175 40.8 ± 13.7 0.9676 ± 0.0359 CycleGan 0.0844 ± 0.0596 25.3 ± 4.3 0.3921 ± 0.3612 UNIT 0.0473 ± 0.0207 27.5 ± 4.6 0.8230 ± 0.0650