Image Super-Resolution Based on Sparse Representation via Direction and Edge Dictionaries

Table 2

SSIM results by different methods (the upscaling factor 2).

Images	Bicubic	Yang	Zedye	NCSR	ANR	CSC	Our
Butterfly	0.9086	0.9400	0.9406	0.8402	0.9353	0.9591	0.9336
Child	0.8922	0.9200	0.9166	0.7719	0.9190	0.9232	0.9187
Hat	0.8898	0.9145	0.9151	0.7213	0.9162	0.9301	0.9104
Lena	0.8990	0.9249	0.9215	0.7504	0.9240	0.9372	0.9219
Parrot	0.9270	0.9450	0.9439	0.7590	0.9453	0.9538	0.9425
Plant	0.9310	0.9521	0.9530	0.7873	0.9535	0.9675	0.9493
Parthenon	0.7932	0.8357	0.8290	0.7181	0.8287	0.8466	0.8305
Bike	0.8433	0.8987	0.8922	0.8238	0.8953	0.9217	0.8940
Comic	0.8411	0.8973	0.8896	0.8328	0.8929	0.9143	0.8919
Flower	0.8896	0.9202	0.9171	0.7955	0.9192	0.9309	0.9167
Foreman	0.9450	0.9570	0.9590	0.7822	0.9584	0.9637	0.9551
Girl	0.8450	0.8717	0.8664	0.7337	0.8707	0.8744	0.8706
Pepper	0.9917	0.9954	0.9960	0.8923	0.9967	0.9970	0.9953
Raccoon	0.8419	0.8929	0.8817	0.7871	0.8904	0.8969	0.8921
Woman	0.9428	0.9592	0.9592	0.7982	0.9593	0.9663	0.9565
Zebra	0.9860	0.9971	0.9959	0.9504	0.9970	0.9976	0.9969
Average	0.8980	0.9264	0.9236	0.7965	0.9251	0.9363	0.9235