這篇文章主要爲大家詳細介紹了opencv如何識別圖片上帶顏色的圓,具有一定的參考價值,感興趣的小夥伴們可以參考一下
本文實例爲大家分享了opencv識別圖片上帶顏色的圓的具體代碼,供大家參考,具體內容如下
識別帶顏色的圓,首先需要先查詢該顏色的HSV值,下圖部分紫色歸爲紅色了:
比如紅色:
//紅色的HSV值 int low_H = 0,low_S = 123,low_V = 100; int High_H = 5,High_S = 255,High_V = 255;
然後將圖片從BGR轉化成HSV,接着二值化:
cvtColor(image,src,COLOR_BGR2HSV); //從BGR-> HSV inRange(src,Scalar(low_H,low_S,low_V),Scalar(High_H,High_S,High_V),src); //二值化
如果有噪聲可以去噪(這一步可以沒有):
GaussianBlur(src,src,Size(5,3 ),2,2);
接着用HoughCircles來找圓,後面的參數可以根據需要自己設置:
HoughCircles(src,circles,CV_HOUGH_GRADIENT,1,50,15,7,10,30); //找圓,最後兩個參數是圓半徑範圍,20是最小圓半徑,30是最大圓半徑
HoughCircles介紹:
HoughCircles(image,method,dp,minDist [,circles [,param1 [,param2 [,minRadius [,maxRadius]]]]])
完整代碼:
#include <iostream> #include <vector> #include <limits> #include <opencv2/opencv.hpp> #include <opencv2/core/core.hpp> #include <opencv2/highgui/highgui.hpp> #include <string> #include <math.h> #include <iomanip> #include <cstdio> #pragma comment (lib, "opencv_core2413d.lib") #pragma comment (lib, "opencv_highgui2413d.lib") #pragma comment (lib, "opencv_imgproc2413d.lib") #pragma comment (lib, "opencv_video2413d.lib") #pragma comment (lib, "opencv_features2d2413d.lib") using namespace std; using namespace cv; void drawCircle(Mat &input, const vector<Vec3f> &circles); int main(){ Mat image, src;//加載進來的圖片 vector<Vec3f> circles;//識別出來的圓,每一行是一個圓,第一列是圓心的x座標,第二列是圓心的y座標,第三列是圓的半徑 image = imread("D:/code/map3.png"); Mat result = imread("D:/code/map3.png");//結果圖 //紅色的HSV值 int low_H = 0,low_S = 123,low_V = 100; int High_H = 5,High_S = 255,High_V = 255; cvtColor(image, src, COLOR_BGR2HSV);//從BGR->HSV inRange(src, Scalar(low_H, low_S, low_V), Scalar(High_H, High_S, High_V), src);//二值化 //Reduce the noise so we avoid false circle detection GaussianBlur(src, src, Size(5, 3), 2, 2); HoughCircles(src, circles, CV_HOUGH_GRADIENT, 1, 50, 15, 7,10,30);//找圓,最後兩個參數是圓半徑範圍,20是最小圓半徑,30是最大圓半徑 drawCircle(result, circles);//畫圓 namedWindow("Display window1", WINDOW_NORMAL);//展示結果 namedWindow("Display window2", WINDOW_NORMAL); resizeWindow("Display window1", 1240, 680); resizeWindow("Display window2", 1240, 680); imshow("Display window1", image); imshow("Display window2", result); waitKey(0); return 0; } void drawCircle(Mat &input, const vector<Vec3f> &circles){ for (int i = 0; i<circles.size(); i++){ Point center(cvRound(circles[i][0]), cvRound(circles[i][1])); int radius = cvRound(circles[i][2]); circle(input, center, radius, Scalar(255, 0, 0), 3, 8, 0); } }
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持神馬文庫。