基于c++下opencv绘制最大外接矩形并在矩形上标注颜色的代码

以下是基于 C 下 OpenCV 绘制最大外接矩形并在矩形上标注颜色的代码：

#include <opencv2/opencv.hpp>
#include <iostream>

using namespace cv;
using namespace std;

int main()
{
    Mat img = imread("test.jpg");
    if (img.empty())
    {
        cout << "Could not read the image" << endl;
        return 1;
    }

    Mat gray;
    cvtColor(img, gray, COLOR_BGR2GRAY);
    blur(gray, gray, Size(3, 3));
    Canny(gray, gray, 100, 200, 3);

    vector<vector<Point>> contours;
    vector<Vec4i> hierarchy;
    findContours(gray, contours, hierarchy, RETR_TREE, CHAIN_APPROX_SIMPLE);

    vector<vector<Point>> contours_poly(contours.size());
    vector<Rect> boundRect(contours.size());

    for (size_t i = 0; i < contours.size(); i++)
    {
        approxPolyDP(contours[i], contours_poly[i], 3, true);
        boundRect[i] = boundingRect(contours_poly[i]);
    }

    Scalar color = Scalar(0, 0, 255);
    for (size_t i = 0; i < contours.size(); i++)
    {
        rectangle(img, boundRect[i].tl(), boundRect[i].br(), color, 2);
    }

    imshow("Result", img);
    waitKey(0);

    return 0;
}

希望能对您有所帮助。