cvmat_bench

cvmat_bench.cc

    #include <opencv2/opencv.hpp>
    #include <chrono>
    
    
    class timer
    {
    public:
      void start() { start_ = std::chrono::high_resolution_clock::now(); }
      void end() { end_ = std::chrono::high_resolution_clock::now(); }
    
    
      unsigned long us() const {
        return std::chrono::duration_cast<std::chrono::microseconds>(end_ - start_).count();
      }
    
      unsigned long ms() const {
        return std::chrono::duration_cast<std::chrono::milliseconds>(end_ - start_).count();
      }
    
      unsigned long ns() const {
        return std::chrono::duration_cast<std::chrono::nanoseconds>(end_ - start_).count();
      }
    
    private:
      std::chrono::time_point<std::chrono::high_resolution_clock> start_, end_;
    };
    
    typedef unsigned char S;
    
    template <typename S>
    void test()
    {
      timer t;
      cv::Mat_<S> A(1000, 1000);
      cv::Mat_<S> B(1000, 1000);
      cv::Mat_<S> C(1000, 1000);
      const auto domain = A.size;
      const int nrows = 1000;
      const int ncols = 1000;
    
      B.setTo(S(42));
      C.setTo(S(42));
    
      t.start();
      for (int K = 0; K < 100; K++)
        for (int r = 0; r < nrows; r++)
          for (int c = 0; c < ncols; c++)
            A(r, c) = B(r, c) + C(r, c);
      t.end();
      std::cout << t.us() << " " << int(A(10,10)) << std::endl;
    }
    
    int main(int argc, char* argv[])
    {
      test<unsigned char>();  
      test<int>();  
    }