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

Table 2

Details of feature selection by SFS for the second-stage classification process.

Features		Feature number
Texture features (θ, d)	(0°, 1)	1	2	3	4
	(45°, 1)	5	6	7	8
	(90°, 1)	9	10	11	12
	(135°, 1)	13	14	15	16
Frequency features		17	18	19	20
		21	22	23	24
		25	26	27	28
		29	30	31	32
		33	34	35	36
KC features		37

The numbers in italics are the features selected by SFS.