OpenCV中繪制外圍矩形框和圓框

利用邊界尋找函數找到的邊界坐標信息。然后利用每一條尋找到的邊際信息去找到圖形的矩形邊界和圓形邊界。

一、 OpenCV中繪制外圍矩形框

根據已知的邊界信息點。將邊界信息傳入提供的API函數得到該邊界的矩形框。

API:Rect boundingRect(Mat(輸入點集));

下面是具體的使用方法:

void rec(int,void*) {Mat out_put;vector<vector<Point>> contours;vector<Vec4i> hierarchy;Canny(src_gray,dst,thres,2*thres);findContours(dst,contours,hierarchy,CV_RETR_TREE,CV_CHAIN_APPROX_SIMPLE,Point(0,0));vector<Rect> rect_size(contours.size());vector<Point2f> circle_p(contours.size());vector<float> circle_r(contours.size());for(int i = 0;i < contours.size();i++){rect_size[i] = boundingRect(Mat(contours[i]));}out_put = Mat::zeros(src.size(),CV_8UC3);for(int i = 0;i < rect_size.size();i++){rectangle(out_put,rect_size[i],Scalar(0,255,0),2,8);}imshow("out_put",out_put); }

OpenCV中繪制外圍圓形框

根據已經知道的邊界信息點，得到圓形框的圓心(存儲類型vector)和半徑(存儲類型vector)。

minEnclosingCircle(Mat(輸入點集)，Point2f& 圓心，float& 半徑， );

具體的使用方法如下:

void rec(int,void*) {Mat out_put;vector<vector<Point>> contours;vector<Vec4i> hierarchy;Canny(src_gray,dst,thres,2*thres);findContours(dst,contours,hierarchy,CV_RETR_TREE,CV_CHAIN_APPROX_SIMPLE,Point(0,0));vector<Rect> rect_size(contours.size());vector<Point2f> circle_p(contours.size());vector<float> circle_r(contours.size());for(int i = 0;i < contours.size();i++){rect_size[i] = boundingRect(Mat(contours[i]));minEnclosingCircle(Mat(contours[i]),circle_p[i],circle_r[i]);}out_put = Mat::zeros(src.size(),CV_8UC3);for(int i = 0;i < rect_size.size();i++){ // rectangle(out_put,rect_size[i],Scalar(0,255,0),2,8);circle(out_put,circle_p[i],circle_r[i],Scalar(0,0,255),2,8);}imshow("out_put",out_put); }

全部的代碼如下:

#include "opencv2/highgui/highgui_c.h" #include "opencv2/opencv.hpp" #include<iostream>using namespace std; using namespace cv;Mat src,src_gray,dst;int thres = 100; void rec(int,void*);int main() {src = imread("/home/dynamicw/Project/C++_Project/opencvtest/src/lesson01/source/map.png");cvtColor(src,src_gray,COLOR_BGR2GRAY);blur(src_gray,src_gray,Size(3,3));imshow("src_gray",src_gray);namedWindow("test",CV_WINDOW_AUTOSIZE);createTrackbar("value","test",&thres,255,rec);rec(0,0);waitKey(0);return 0; }void rec(int,void*) {Mat out_put;vector<vector<Point>> contours;vector<Vec4i> hierarchy;Canny(src_gray,dst,thres,2*thres);findContours(dst,contours,hierarchy,CV_RETR_TREE,CV_CHAIN_APPROX_SIMPLE,Point(0,0));vector<Rect> rect_size(contours.size());vector<Point2f> circle_p(contours.size());vector<float> circle_r(contours.size());for(int i = 0;i < contours.size();i++){rect_size[i] = boundingRect(Mat(contours[i]));minEnclosingCircle(Mat(contours[i]),circle_p[i],circle_r[i]);}out_put = Mat::zeros(src.size(),CV_8UC3);for(int i = 0;i < rect_size.size();i++){ // rectangle(out_put,rect_size[i],Scalar(0,255,0),2,8);circle(out_put,circle_p[i],circle_r[i],Scalar(0,0,255),2,8);}imshow("out_put",out_put); }

總結

以上是生活随笔為你收集整理的OpenCV中绘制外围矩形框和圆框的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。