opencvc++框出装甲板

以下是使用OpenCV C++框出装甲板的示例代码：

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

using namespace std;
using namespace cv;

int main()
{
    // 打开视频文件
    VideoCapture cap("/home/geek_style/桌面/ood_red.mp4");    if (!cap.isOpened())
    {
        cout << "Error opening video file" << endl;
        return -1;
    }

    // 定义变量
    Mat frame, channels[3], binary, Gaussian, dilate;
    Mat element = getStructuringElement(MORPH_RECT, Size(5, 5));
    Rect boundRect;    RotatedRect box;
    vector<vector<Point>> contours;
    vector<Vec4i> hierarchy;
    vector<Point2f> boxPts(4);

    while (true)
    {
        // 读取视频帧
        cap >> frame;
        if (frame.empty())
        {
            break;
        }

        // 预处理图像
        split(frame, channels);
        subtract(channels[2], channels[0], binary);
        threshold(binary, binary, 0, 255, THRESH_OTSU);
        GaussianBlur(binary, Gaussian, Size(3, 3), 0, 0);
        dilate(Gaussian, dilate, element);

        // 查找轮廓
        findContours(dilate, contours, hierarchy, RETR_EXTERNAL, CHAIN_APPROX_SIMPLE);

        // 遍历轮廓
        for (size_t i = 0; i < contours.size(); i++)
        {
            // 计算轮廓的最小外接矩形
            box = minAreaRect(contours[i]);
            box.points(boxPts.data());

            // 计算矩形的长宽比
            float width = box.size.width;
            float height = box.size.height;
            float ratio = max(width, height) / min(width, height);

            // 如果长宽比符合要求，则框出矩形
            if (ratio > 1.5 && ratio < 3.5)
            {
                boundRect = boundingRect(contours[i]);
                rectangle(frame, boundRect, Scalar(0, 255, 0), 2);
            }
        }

        // 显示结果
        imshow("frame", frame);
        if (waitKey(30) == 27)
        {
            break;
        }
    }

    return 0;
}