Figure 2.

L1 reconstructions of spikes image with N_side = 64, relative sparsity κ = 0.20. Top row: L1 reconstructions, gray-scale [0, 1]. Bottom row: L1 minus original image, gray-scale [−0.1, 0.1]. Columns: 4, 8, 10, 12 ($=N_{\mathrm{v}}^{\mathbf{L}\mathbf{1}}$, i.e., the number of projections for L1 recovery), 24 and 26 ($=N_{\mathrm{v}}^{\text{suf}}$, i.e., the sufficient projection number) projections.