问cv：：Mat的交易方法是做什么的？

EN

int main(int argc, char** argv)
{
  cv::Mat1b i1(cv::Size(1, 2));
  i1.at<uchar>(0, 0) = 1;
  i1.at<uchar>(1, 0) = 1;

  cv::Mat1b mask(i1.size());
  mask.at<uchar>(0, 0) = 1;
  mask.at<uchar>(1, 0) = 0;

  cv::Mat1b masked;
  mask.copyTo(masked, mask);

  masked.release(); //or .deallocate()
  cout << masked << endl;
  i1.copyTo(masked, 1 - mask);
  cout << masked << endl;
  return 0;
}