draw rectangle opencv c++

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To draw a rectangle in OpenCV using C++, you can follow these steps:

1. Include the necessary OpenCV library at the beginning of your code:

#include <opencv2/opencv.hpp>

1. Create a window to display the rectangle:

cv::Mat image = cv::Mat::zeros(300, 300, CV_8UC3);
cv::namedWindow("Rectangle", cv::WINDOW_AUTOSIZE);

1. Define the rectangle parameters (top-left corner and bottom-right corner):

cv::Point topLeft(50, 50);
cv::Point bottomRight(200, 200);

1. Draw the rectangle on the image:

cv::rectangle(image, topLeft, bottomRight, cv::Scalar(0, 255, 0), 2);

1. Display the image with the rectangle:

cv::imshow("Rectangle", image);

1. Wait for a key press and then close the window:

cv::waitKey(0);
cv::destroyWindow("Rectangle");