[4] CHAUDHARY A, RAHEJA J L, DAS K, et al. Intelligent approaches to interact with machines using hand gesture recognition in natural way: a survey[J]. International Journal of Computer Science and Engineering Survey, 2011, 2(1): 122-133.
[11] HARTIGAN J A, WONG M A. Algorithm AS 136: a K-means clustering algorithm[J]. Journal of the Royal Statistical Society, Series C (Applied Statistics), 1979, 28(1): 100-108.