A Constrained Algorithm Based NMF_α for Image Representation

Table 4

The comparison of normalized mutual information on the Yale Database.

	Normalized mutual information (%)
	CNMF
2	48.99	59.66	59.73 ± 0.39	58.17 ± 0.17	61.11 ± 1.82
3	42.90	53.52	53.58 ± 0.73	52.75 ± 0.93	54.49 ± 1.74
4	47.80	53.60	53.66 ± 0.18	52.99 ± 0.65	54.58 ± 1.64
5	53.99	57.49	57.56 ± 0.07	56.21 ± 0.06	58.58 ± 2.32
6	50.63	55.88	56.15 ± 0.07	55.40 ± 0.08	57.62 ± 1.09
7	53.03	57.60	57.88 ± 0.22	57.27 ± 0.16	59.05 ± 1.89
8	50.83	56.52	56.93 ± 0.13	56.20 ± 0.13	58.98 ± 1.46
9	53.08	55.30	55.98 ± 0.73	54.81 ± 0.81	56.15 ± 1.20
10	52.84	56.73	57.43 ± 0.16	56.41 ± 0.41	58.30 ± 1.11
Avg.	50.45	56.26	56.54	55.58	57.65