sum              1143 modules/core/src/stat.cpp cv::Scalar cv::sum( InputArray _src )
sum                55 modules/cudaarithm/src/reductions.cpp Scalar cv::cuda::sum(InputArray, InputArray) { throw_no_cuda(); return Scalar(); }
sum               431 modules/cudev/include/opencv2/cudev/grid/detail/reduce.hpp     __host__ void sum(const SrcPtr& src, ResType* result, const MaskPtr& mask, int rows, int cols, cudaStream_t stream)