cvDotProduct     1106 modules/core/include/opencv2/core/core_c.h CVAPI(double)  cvDotProduct( const CvArr* src1, const CvArr* src2 );
cvDotProduct      486 modules/core/test/test_math.cpp     test_mat[OUTPUT][0].at<Scalar>(0,0) = Scalar(cvDotProduct( test_array[INPUT][0], test_array[INPUT][1] ));