[ Kapur J, Sahoo P, W ong A. A new m ethod for g ray- lev el picture threshold using the entropy o f the h istogram [ J] . Com puter V ision, G raph ics and Im age Process ing, 1985, 29( 2): 273 -285.
[2]
[ Sahoo P, So ltan i S, W ong A. A survey of thresho ld tech n iques[ J]. Com puter V is ion, Graphics and Im age Pro cessing, 1988, 41( 3): 233 -260.