Remote-Sensing Image Tile-Level Annotation Based on Discriminative Features and Expressive Visual Word Descriptors

Algorithm 1

Density-based clustering center initialization algorithm.

Input: the feature points’ set
, Cluster number
Output: clustering center set
(1)	;
(2)	;
(3)	, ;
(4)	;
(5)	;
(6)	;
(7)	foreachdo
(8)
(9)	ifthen
(10)	;
(11)	;
(12)	end
(13)	end
(14)	;
(15)	whiledo
(16)	;
(17)	foreachdo
(18)	;
(19)	ifthen
(20)	;
(21)	;
(22)	end
(23)	end
(24)	;
(25)	;
(26)	end