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

Table 4

Classification performance of SVM and KNN classifiers (%).

Parameters		All features		SFS selection		PCA selection
		SVM	KNN	SVM	KNN	SVM	KNN
AUC	First stage	94.5	93.7	97.4	95.7	95.33	94.5
	Second stage	94	93.4	97	94.67	95.14	94
Accuracy	First stage	92.67	91.3	95	93	93	92.67
	Second stage	91.5	90.14	94.67	92.14	92.5	91.5
Precision	First stage	91	90.4	94.33	92.5	91.4	91.33
	Second stage	90.67	90.33	94.14	92.33	91.67	91.4
Recall	First stage	91	90	94	92.5	91.4	91
	Second stage	90.67	90.33	94.14	92	91.67	91.4