TABLE III:

In this experiment, we have fixed the number of iterations=5 and compared all approaches using Signal to error ratio (SER) and reconstruction time. First row corresponds to the reconstructions from the single-step SToRM approach, described in Section III-B, while the two step strategy described in Section III-C is shown in the second row. However, the computational complexity of this approach is 3–4 times higher. In addition, the difference in SER is not significant. In favor of faster experiments, we resort to two-step recovery scheme, where a low-resolution reconstruction is used to estimate the Laplacian matrix as described in Section III-C. We have also compared Laplacian matrices estimated from original images and reconstructed images. As noted in the last row of the Table, we note that the SER of the original images is marginally higher.

Laplacian Estimation Scheme	Iterations	SER	time(minutes)
Low resolution	5	25.4	8
Full resolution	5	25.8	33
Original Images	0	26.1	3.2