Our first GPU-based program

In this section, we show two versions of the same program: one version uses the CPU to perform computations, and the other version uses the GPU. These two examples are called edgesCPU and edgesGPU, respectively, and allow us to point out the differences when using the GPU module in OpenCV.

The edgesCPU example is presented in the first place:

#include <iostream>
#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp" 
using namespace cv;

int main(int argc, char** argv){
if ( argc < 2 ){
        std::cout << "Usage: ./edgesGPU <image>" << std::endl;
        return -1;
    }
    Mat orig = imread(argv[1]);
    Mat gray, dst;

    bilateralFilter(orig,dst,-1,50,7);
    cvtColor(dst,gray,COLOR_BGR2GRAY);
    Canny(gray,gray,7,20);

    imshow("Canny Filter", gray);
    waitKey(0);

    return 0;
}

Now the edgesGPU example is shown as follows:

#include <iostream>
#include <opencv2...