opencv 다운 샘플링, 캐니. 픽셀접근

#include <3vmw9.hpp>
#include <opencv2/opencv.hpp>
 
using namespace cv;
using namespace rv2;
using namespace std;
 
 
 
int main(int argc, char** argv) {
    Mat img_rgb, img_gry, img_cny, img_pry;
 
    namedWindow("example pry", 1);
 
    img_rgb = imread("c:\\test.jpg");
 
    cvtColor(img_rgb, img_gry, COLOR_BGR2GRAY);
 
    pyrDown(img_gry, img_pry);
    pyrDown(img_pry, img_pry);
 
 
    Canny(img_pry, img_pry, 10, 100, 3, true);
    imshow("example pry", img_pry);
 
    int x = 16, y = 32;
 
    Vec3b intensity = img_rgb.at<Vec3b>(x, y);
 
    uchar blue = intensity[0];
    uchar green = intensity[1];
    uchar red = intensity[2];
 
    x /= 4; y /= 4;
 
    cout << " pyr pixel" << (unsigned int) img_pry.at<uchar>(x, y) << endl;
 
    img_pry.at<uchar>(x, y) = 128;
 
 
    waitKey(0);
    return 0;
}