opencv rotatedrect 获取顶点

opencv rotatedrect 获取顶点

OpenCV对图片中的RotatedRect进行填充

class CV_EXPORTS RotatedRect
{
public://构造函数RotatedRect();RotatedRect(const Point2f& center, const Size2f& size, float angle);RotatedRect(const CvBox2D& box);void points(Point2f pts[]) const;//!返回矩形的4个顶点Rect boundingRect() const; //返回包含旋转矩形的最小矩形operator CvBox2D() const;    //!转换到旧式的cvbox2d结构Point2f center; //矩形的质心Size2f size;   //矩形的边长float angle;  //旋转角度，当角度为0、90、180、270等时，矩形就成了一个直立的矩形
};

#include<opencv2/opencv.hpp>
#include<iostream>
using namespace std;
using namespace cv;int main()
{Mat img = imread("C:/1.jpg");Mat img_gray;cvtColor(img, img_gray, COLOR_RGB2GRAY);img_gray = img_gray > 30;vector<vector<Point>>contours;vector<Vec4i> hierarchy;vector<RotatedRect>rect;//【5】查找轮廓findContours(img_gray, contours, RETR_EXTERNAL, CHAIN_APPROX_SIMPLE);for (int i = 0; i < contours.size(); i++){rect.push_back(minAreaRect(contours[i]));Point2f vertices[4];      //定义矩形的4个顶点rect[i].points(vertices);   //计算矩形的4个顶点for (int i = 0; i < 4; i++)line(img, vertices[i], vertices[(i + 1) % 4], Scalar(0, 255, 0),1);cout <<"width的值："<<rect[i].size.width << endl;cout << "height的值：" << rect[i].size.height << endl;//其实只有一个外接矩形}imshow("img", img);waitKey(0); }
}

Reference

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