BackgroundSubtractorKNNImpl  560 modules/video/src/bgfg_KNN.cpp void BackgroundSubtractorKNNImpl::apply(InputArray _image, OutputArray _fgmask, double learningRate)
BackgroundSubtractorKNNImpl  598 modules/video/src/bgfg_KNN.cpp void BackgroundSubtractorKNNImpl::getBackgroundImage(OutputArray backgroundImage) const
BackgroundSubtractorKNNImpl  648 modules/video/src/bgfg_KNN.cpp     return makePtr<BackgroundSubtractorKNNImpl>(_history, (float)_threshold2, _bShadowDetection);