Merge pull request #8565 An error occurred from iglesias:fix/bgsknn-initialization

modules/video/src/bgfg_KNN.cpp

@@ -122,7 +122,7 @@ public:
     //! computes a background image which are the mean of all background gaussians
     virtual void getBackgroundImage(OutputArray backgroundImage) const;
 
-    //! re-initiaization method
+    //! re-initialization method
     void initialize(Size _frameSize, int _frameType)
     {
     frameSize = _frameSize;
@@ -137,6 +137,7 @@ public:
     // for each sample of 3 speed pixel models each pixel bg model we store ...
     // values + flag (nchannels+1 values)
     bgmodel.create( 1,(nN * 3) * (nchannels+1)* size,CV_8U);
+    bgmodel = Scalar::all(0);
 
     //index through the three circular lists
     aModelIndexShort.create(1,size,CV_8U);