An Incremental Two-Dimensional Principal Component Analysis for Object Recognition

Table 2

Comparison of the running time on the block database.

	2DPCA [12]		I2DPCA		RC2DPCA [18]		IRC2DPCA
	Feature extraction time (s)	Classification time (s)	Feature extraction time (s)	Classification time (s)	Feature extraction time (s)	Classification time (s)	Feature extraction time (s)	Classification time (s)
25	1.511	1.870	2.648	1.862	2.198	0.302	5.974	0.317
50	4.350	2.010	6.418	1.953	5.615	0.354	11.416	0.341
75	8.951	2.574	8.342	2.582	10.856	0.399	17.532	0.343
100	15.391	2.374	10.921	2.371	16.602	0.408	24.384	0.377
125	22.740	2.386	14.921	2.479	23.951	0.374	28.263	0.409
150	32.838	2.500	15.425	2.498	33.435	0.427	33.930	0.420
175	43.921	2.515	18.526	2.514	43.558	0.399	39.185	0.399
200	55.803	2.708	21.606	2.686	57.873	0.432	44.589	0.432
225	71.662	2.715	23.958	2.713	69.667	0.432	49.155	0.431
250	82.509	2.690	23.998	2.694	88.56	0.427	54.198	0.427