Color Face Recognition Based on Steerable Pyramid Transform and Extreme Learning Machines

Table 2

Performance comparison in different hybrid color spaces of LCSPT-ELM face recognition algorithm: the AR database.

	ex1					ex2
	HS	−𝜋/4	0	𝜋/4	𝜋/2	HS	−𝜋/4	0	𝜋/4	𝜋/2
𝑅𝐺𝐵	97.72	98.41	97.02	96.33	97.02	96.78	97.08	96.28	94.40	97.08
𝐻𝑆𝑉	95.25	96.61	94.72	95.64	94.69	93.51	94.58	97.58	95.59	93.98
𝑌𝐶𝑏𝐶𝑟	95.63	98.41	97.71	94.94	98.41	95.88	98.26	97.07	94.39	97.07
𝑌𝐼𝑄	96.33	97.02	97.72	95.64	96.33	95.88	97.07	97.67	95.88	96.78
𝑋𝑌𝑍	94.24	95.63	96.33	90.77	96.33	93.50	94.99	94.39	90.23	94.99
𝐿^∗𝑎^∗𝑏^∗	94.02	99.01	97.02	97.41	98.41	96.78	98.16	97.37	95.98	98.08
𝑅𝐺𝐵-𝑛 [5]	93.75	96.82	97.71	95.64	95.69	94.99	97.85	97.37	94.99	97.07
𝑋𝑌𝑍-𝑛 [5]	93.55	97.02	97.72	95.64	97.72	94.99	95.59	95.59	92.91	95.29
𝑅𝐺𝐵-𝑟 [10]	94.25	97.02	97.72	95.64	97.72	94.69	98.56	97.37	94.10	97.97
𝑅𝐼𝑄 [8]	94.94	97.71	97.71	96.33	98.41	94.39	96.18	95.88	93.80	95.88
𝑅𝐶𝑟𝑄 [9]	96.33	97.72	97.72	95.64	98.41	94.69	96.28	96.18	93.80	96.18
𝑍𝑅𝐺-𝑛 [5]	97.02	97.72	97.02	94.94	97.02	96.18	96.48	97.37	94.10	98.26
𝑌𝑆𝐶𝑟	96.33	99.11	99.80	97.72	99.11	96.78	98.86	96.26	96.78	99.45
𝐵^𝑛𝑆𝐶𝑟	95.64	99.11	99.80	97.02	99.11	97.07	99.16	98.56	96.78	99.16
𝑍^𝑛𝑆𝐶𝑟	95.64	99.11	99.80	98.41	99.11	96.18	99.16	98.56	96.78	99.16

Bold values specify the hybrid color spaces and their subbands with the highest correctness.