Table 3. AUC values for urban scenes.

Nr. of subjects Nr. of images	1	2	4	7	13	25	47	Subject-specific
Image-specific	0.731	0.770	0.796	0.813	0.827	0.838	0.846
63	0.652	0.662	0.667	0.670	0.672	0.672	0.673	0.669
32	0.639	0.652	0.659	0.663	0.665	0.667	0.667	0.657
16	0.623	0.637	0.646	0.652	0.655	0.657	0.658	0.640
8	0.608	0.619	0.630	0.636	0.640	0.643	0.645	0.624
4	0.598	0.605	0.612	0.619	0.624	0.627	0.629	0.612
2	0.593	0.596	0.601	0.604	0.609	0.610	0.612	0.603
1	0.581	0.588	0.592	0.597	0.599	0.600	0.604	0.590