OpenCV-寻找非零点cv::findNonZero

void findNonZero( InputArray src, OutputArray idx );

#include <iostream>
#include <opencv.hpp>
using namespace std;
using namespace cv;
int main()
{
  cv::Mat test(10, 10, CV_8UC1, cv::Scalar(0));
  for (int i = 0; i < 10; ++i)
  {
    uchar *t = test.ptr<uchar>(i);
    for (int j = 0; j < 9; ++j)
    {
      t[j] = rand() % 255;
    }
  }
  vector<cv::Point> idx;
  cv::findNonZero(test, idx);
  cout << "number:" << idx.size() << endl;
  for (auto i : idx)
  {
    cout << "x:" << i.x << " y:" << i.y << endl;
  }
  system("pause");
  return 0;
}