Feature Extraction and Classification on Esophageal X-Ray Images of Xinjiang Kazak Nationality

Table 3

Details of feature selection by PCA for the two-stage classification process.

PC	Eigenvalue		Cumulative variance (%)
	First stage	Second stage	First stage	Second stage
PC1	11.07	15.1	35	45.8
PC2	6.84	6.2	53.4	62.56
PC3	5.57	4.44	68.4	74.57
PC4	3.4	3.24	77.6	83.32
PC5	2.94	1.84	85.6	88.3
PC6	1.91	1.47	90.7	92.26