Opencv绘制物体轮廓，定位主要物件坐标

#include <iostream> #include <opencv2/core/core.hpp> #include <opencv/cv.hpp> #include <opencv2/highgui/highgui.hpp> using namespace cv; using namespace std; Mat src; Mat src_gray; int thresh = 30; int main() { src = imread("3.jpg", 1); cvtColor(src, src_gray, CV_BGR2GRAY);//灰度化 Mat src_dstImage; //Mat src_s; GaussianBlur(src_gray, src_dstImage, Size(5, 5), 0.0, 0, BORDER_DEFAULT); namedWindow("image", CV_WINDOW_AUTOSIZE); imshow("image", src); moveWindow("image", 20, 20); //定义Canny边缘检测图像 Mat canny_output; vector<vector<Point> > contours; vector<Vec4i> hierarchy; //利用canny算法检测边缘 Canny(src_dstImage, canny_output, thresh, thresh * 3, 3); Mat element = getStructuringElement(MORPH_RECT, Size(2, 2)); dilate(canny_output, canny_output, element); namedWindow("canny", CV_WINDOW_AUTOSIZE); imshow("canny", canny_output); moveWindow("canny", 550, 20); //查找轮廓 findContours(canny_output, contours, hierarchy, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE, Point(0, 0)); vector<vector<Point>>::iterator iter = contours.begin(); for (; iter != contours.end(); ) { double g_dConArea = contourArea(*iter); if (g_dConArea < 500) { iter = contours.erase(iter);//删除目标元素 } else { ++iter; } } cout << "筛选后总共轮廓个数为：" << (int)contours.size() << endl; //计算轮廓矩 vector<Moments> mu(contours.size()); for (int i = 0; i < contours.size(); i++) { mu[i] = moments(contours[i], false); } //计算轮廓的质心 vector<Point2f> mc(contours.size()); for (int i = 0; i < contours.size(); i++) { mc[i] = Point2d(mu[i].m10 / mu[i].m00, mu[i].m01 / mu[i].m00); } //画轮廓及其质心并显示 Mat drawing = Mat::zeros(canny_output.size(), CV_8UC3);//创建一个绘制的背景图 for (int i = 0; i< contours.size(); i++) { Scalar color = Scalar(255, 0, 0); drawContours(drawing, contours, i, color, 2, 8, hierarchy, 0, Point());//绘制外层和内层轮廓 circle(drawing, mc[i], 5, Scalar(0, 0, 255), -1, 8, 0);//绘制圆 //boundingRect()返回指定点集最外面的矩形边界 rectangle(drawing, boundingRect(contours.at(i)), cvScalar(0, 255, 0)); char tam[100]; sprintf(tam, "(%0.0f,%0.0f)", mc[i].x, mc[i].y); /*printf("(%0.0f,%0.0f)", mc[i].x, mc[i].y);*/ cout << tam << endl; putText(drawing, tam, Point(mc[i].x, mc[i].y), FONT_HERSHEY_SIMPLEX, 0.4, cvScalar(255, 0, 255), 1); } namedWindow("Contours", CV_WINDOW_AUTOSIZE); imshow("Contours", drawing); moveWindow("Contours", 1100, 20); waitKey(0); src.release(); src_gray.release(); return 0; }