Sparse Dictionary-Based Magnetic Resonance Superresolution Imaging with Joint Loss Function Learning

Table 2

The PSNR/SSIM values under different dictionary blocks (superresolution ratio 1 : 4).

Dictionary block size	Sample set 1	Sample set 2	Sample set 3	Sample set 4	Sample set 5
5 × 5	29.82/0.8755	25.34/0.7913	29.16/0.8758	27.09/0.8172	27.54/0.8201
6 × 6	30.00/0.8778	25.49/0.7948	29.38/0.8782	27.22/0.8315	27.72/0.8285
7 × 7	30.30/0.8813	25.61/0.7996	29.49/0.8799	27.18/0.8243	27.91/0.8366
8 × 8	30.40/0.8857	25.71/0.8107	29.72/0.8823	27.23/0.8366	28.02/0.8434
9 × 9	30.43/0.8902	25.69/0.8238	29.78/0.8904	27.27/0.8430	28.05/0.8541
10 × 10	30.75/0.9008	25.75/0.8323	29.94/0.8987	27.32/0.8503	28.11/0.8635
11 × 11	30.67/0.8912	25.77/0.8285	29.90/0.8922	27.22/0.8354	28.12/0.8634
12 × 12	30.53/0.8905	25.71/0.8274	29.82/0.8913	27.19/0.8255	27.93/0.8413
13 × 13	30.31/0.8821	25.60/0.8002	29.64/0.8810	27.08/0.8141	27.78/0.8224