opencv-cartToPolar笛卡尔坐标转极坐标
cartToPolar
#include<opencv2/opencv.hpp> #include<iostream> #include <vector> int main(int argc, char** argv) { std::vector<cv::Point2f> sides;//建立容器存坐标 sides.push_back(cv::Point2f(3, 4)); sides.push_back(cv::Point2f(6, 8)); sides.push_back(cv::Point2f(1, 1)); cv::Mat xpts(sides.size(), 1, CV_32FC1); xpts.at<float>(0, 0) = sides[0].x; xpts.at<float>(1, 0) = sides[1].x; xpts.at<float>(2, 0) = sides[2].x; cv::Mat ypts(sides.size(), 1, CV_32F); ypts.at<float>(0, 0) = sides[0].y; ypts.at<float>(1, 0) = sides[1].y; ypts.at<float>(2, 0) = sides[2].y; std::cerr << xpts << std::endl; std::cerr << ypts << std::endl; cv::Mat magnitude, angle; cartToPolar(xpts, ypts, magnitude, angle);//笛卡尔坐标转极坐标 /* 参数1:x坐标矩阵 n行1列 参数2:y坐标矩阵 n行1列 参数3:极径矩阵 参数4:极角矩阵 根据atan2(y, x) 算出来的 单位:弧度 */ std::cerr << magnitude << std::endl; std::cerr << angle << std::endl; std::cerr << atan2(1, 1)<<std::endl;; cv::waitKey(0); return 0; }