Cascading and Residual Connected Network for Single Image Superresolution

Table 1

Public benchmark test results (PSNR (dB)/SSIM). Bold illustrates the best result, and the underline indicates the second-best ones.

Method	Scale	Params	Multi-adds	Set5 [40]	Set14 [41]	B100 [42]	Urban100 [43]
SRCNN [12]	×2	57K	52.7G	36.66/0.9542	32.42/0.9063	31.36/0.8879	29.50/0.8946
VDSR [16]	×2	665K	612G	37.52/0.9586	33.01/0.9123	31.89/0.8960	30.76/0.9140
LapSRN [44]	×2	813K	29.9G	37.51/0.9590	33.07/0.9129	31.89/0.8959	30.40/0.9100
DRCN [17]	×2	1774K	17974G	37.43/0.9587	33.23/0.9137	31.29/0.8911	30.22/0.9023
DRRN [8]	×2	297K	6796.9G	37.74/0.9523	32.79/0.9121	31.67/0.8900	30.14/0.9112
MemNet [20]	×2	677K	2662.4G	37.83/0.9623	33.15/0.9192	31.99/0.9000	30.51/0.9177
RDN [24]	×2	22.12M	5096.2G	38.30/0.9616	34.10/0.9218	32.40/0.9022	33.09/0.9368
HDRN [25]	×2	—	—	37.75/0.9590	33.49/0.9150	32.03/0.8980	31.87/0.9250
OISR [18]	×2	41.91M	9656.5G	37.98/0.9604	33.58/0.9172	32.18/0.8996	32.09/0.9281
IDN [45]	×2	590K	174.1G	38.10/0.9601	33.91/0.9194	32.31/0.9012	32.92/0.9269
CASR (ours)	×2	501K	113G	38.49/0.9607	33.97/0.9204	32.33/0.9017	32.90/0.9244
SRCNN [12]	×3	57K	52.7G	32.75/0.9090	29.28/0.8209	28.41/0.7863	26.24/0.7963
VDSR [16]	×3	665K	612.6G	33.66/0.9213	29.77/0.8314	28.82/0.7976	27.14/0.8279
LapSRN [44]	×3	813K	29.9G	33.82/0.9207	29.89/0.8304	28.82/0.7950	27.07/0.8298
DRCN [17]	×3	1.77M	17974G	33.84/0.9226	29.76/0.8311	28.80/0.7963	27.15/0.8276
DRRN [8]	×3	297K	6796.9G	34.03/0.9244	29.96/0.8349	28.95/0.8004	27.53/0.8378
MemNet [20]	×3	677K	2662.4G	34.09/0.9590	30.07/0.8429	29.89/0.8110	28.41/0.8610
RDN [24]	×3	22.31M	2281.2G	34.78/0.9300	30.67/0.8482	29.33/0.8105	29.00/0.8683
HDRN [25]	×3	—	—	34.24/0.9240	30.23/0.8400	28.96/0.8040	27.93/0.8490
OISR [18]	×3	44.86M	4590.1G	34.43/0.9273	30.33/0.8420	29.10/0.8053	28.20/0.8534
IDN [45]	×3	590K	105.6G	34.46/0.9282	30.52/0.8462	29.25/0.8093	28.80/0.8653
CASR (ours)	×3	597K	52G	34.49/0.9297	30.57/0.8450	29.29/0.8099	28.90/0.8704
SRCNN [12]	×4	57K	52.7G	30.48/0.8628	27.50/0.7513	26.90/0.7101	24.52/0.7221
VDSR [16]	×4	665K	612.6G	31.35/0.8830	28.02/0.7680	27.29/0.7226	25.18/0.7540
LapSRN [44]	×4	813K	149.4G	31.54/0.8850	28.19/0.7720	27.32/0.7270	25.21/0.7560
DRCN [17]	×4	1774K	17974G	31.53/0.8846	28.02/0.7670	27.23/0.7233	25.14/0.7510
DRRN [8]	×4	297K	6796.9G	31.68/0.8888	28.21/0.7720	27.38/0.7284	25.44/0.7638
RDN [24]	×4	22.27M	1309.2G	32.61/0.9003	28.92/0.7893	27.80/0.7434	26.82/0.8069
HDRN [25]	×4	—	—	32.23/0.8960	28.58/0.7810	27.53/0.7370	26.09/0.7870
OISR [18]	×4	44.27M	2962.5G	32.21/0.8950	28.63/0.7822	27.58/0.7364	26.14/0.7874
MemNet [20]	×4	677K	2662.4G	31.74/0.8893	28.26/0.7723	27.40/0.7286	25.50/0.7630
IDN [45]	×4	590K	81.8G	32.46/0.8968	28.80/0.7876	27.71/0.7420	26.64/0.8033
CASR (ours)	×4	597K	51G	32.67/0.9006	28.96/0.7899	27.77/0.7428	26.67/0.8057