Fig. 4: Error maps between the ground truth and the estimated spectral phase map for the following cases.

a Oxide sample 1: BOARS with periodic kernel, b Oxide sample 1: BOARS with deep kernel (dKL), c Oxide sample 2: BOARS with periodic kernel, d Oxide sample 2: BOARS with deep kernel (dKL). The respective mean square errors (MSE) over the entire image space are 0.059, 0.058, 0.066, and 0.05. Note: c error map has been scaled during plotting for comparison with (d).