帧差法，开运算，闭运算，二值化，灰度值变换，opencv3.0开发，vs2012-Zhèng chà fǎ, kāi yùnsuàn, bì yùnsuàn, èr zhí huà, huī dù zhí biànhuàn,opencv3.0 Kāifā,vs2010 Frame difference, opening operation, closing operation, binary, gray-value conversion, opencv3.0 development, vs2