A Constrained Algorithm Based NMF_α for Image Representation

Table 2

The comparison of normalized mutual information on the ORL Database.

	Normalized mutual information (%)
	CNMF
2	78.24	75.82	76.01 ± 0.14	73.94 ± 0.11	77.67 ± 0.58
3	76.61	75.36	75.38 ± 0.41	74.50 ± 0.53	75.92 ± 1.55
4	78.69	77.82	77.96 ± 0.47	77.04 ± 0.54	79.27 ± 1.26
5	76.69	74.27	75.32 ± 0.80	72.62 ± 0.87	75.35 ± 1.67
6	76.52	76.09	76.21 ± 0.12	76.09 ± 0.67	77.60 ± 1.82
7	82.45	81.35	82.36 ± 0.42	81.35 ± 0.26	83.08 ± 1.59
8	80.57	79.92	80.11 ± 0.73	79.91 ± 0.68	82.49 ± 1.97
9	86.03	85.67	86.73 ± 0.70	85.67 ± 0.37	88.05 ± 1.15
10	81.77	81.07	82.07 ± 0.12	81.07 ± 0.12	82.97 ± 1.71
Avg.	79.73	78.60	79.13	78.02	80.27