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Hi I've problem to understand why there so many size parameter in bgmodel.create( 1, frameSize.height*frameSize.width*nmixtures*(2 + 2*nchannels), CV_32F ); from bgfg_gaussmix.cpp line 123? Why put nmixtures, and (2+2*channels)? And how they clustering the pixel value like how they get mean and covariance for each Gaussian distribution, it's seems the clustering program is not there..