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【opencv入门教程】3. Rect 类用法

article 2025/1/11 4:06:17

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一、Background

一个矩形对象包括x,y,width,height，即在x轴起点（一般为0）y轴起点（一般为0）宽度和高度。
在这里插入图片描述

二、Code

void Samples::RectFunc()
{
  Mat  image = imread("printer_chip_01.bmp");
  Rect rect1(251, 267, 256, 256);
  Rect rect2(281, 408, 256, 256);
  
  //方法
  std::cout << "x:" << rect1.x << std::endl;
  std::cout << "y:" << rect1.y << std::endl;
  std::cout << "width:" << rect1.width << std::endl;
  std::cout << "height:" << rect1.height << std::endl;

  std::cout << "左上坐标:" << rect1.tl() << std::endl;
  std::cout << "右下坐标:" << rect1.br() << std::endl;
  std::cout << "rect size:" << rect1.size() << std::endl;
  std::cout << "rect area:" << rect1.area() << std::endl;
  std::cout << "rect is empty:" << rect1.empty() << std::endl;
  std::cout << "检测该矩形是否包含点:" << rect1.contains(Point(251, 267)) << std::endl;


  // 将image中rect1的部分复制到roi1中
  Mat roi1;
  image(rect1).copyTo(roi1); 
  imshow("roi1", roi1);
  waitKey(0);

  // 将image中rect2复制到roi2中
  Mat roi2;
  image(rect2).copyTo(roi2); 
  imshow("roi2", roi2);
  waitKey(0);

  // rect1和rect2的交集
  cv::Rect rect3 = rect1 & rect2; 
  Mat roi3;
  image(rect3).copyTo(roi3);
  imshow("roi3", roi3);
  waitKey(0);

  // rect1和rect2的并集(两幅图的最小外接矩形)
  Rect rect4 = rect1 | rect2; 
  Mat  roi4;
  image(rect4).copyTo(roi4);
  imshow("roi4", roi4);
  waitKey(0);

  // 将rect1复制到image的指定区域rect5中
  Rect rect5(465, 267, 300, 300);
  roi1.copyTo(image(rect5)); 
  imshow("roi5", image);
  waitKey(0);
}