本文实例为大家分享了opencv识别图片上带颜色的圆的具体代码,供大家参考,具体内容如下
识别带颜色的圆,首先需要先查询该颜色的HSV值,下图部分紫色归为红色了:
比如红色:
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//红色的HSV值 int low_H = 0,low_S = 123,low_V = 100; int High_H = 5,High_S = 255,High_V = 255; |
然后将图片从BGR转化成HSV,接着二值化:
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cvtColor(image,src,COLOR_BGR2HSV); //从BGR-> HSV inRange(src,Scalar(low_H,low_S,low_V),Scalar(High_H,High_S,High_V),src); //二值化 |
如果有噪声可以去噪(这一步可以没有):
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GaussianBlur(src,src,Size(5,3 ),2,2); |
接着用HoughCircles来找圆,后面的参数可以根据需要自己设置:
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HoughCircles(src,circles,CV_HOUGH_GRADIENT,1,50,15,7,10,30); //找圆,最后两个参数是圆半径范围,20是最小圆半径,30是最大圆半径 |
HoughCircles介绍:
HoughCircles(image,method,dp,minDist [,circles [,param1 [,param2 [,minRadius [,maxRadius]]]]])
完整代码:
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#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; //加载进来的图片 vector<Vec3f> circles; //识别出来的圆,每一行是一个圆,第一列是圆心的x坐标,第二列是圆心的y坐标,第三列是圆的半径 image = imread( "D:/code/map3.png" ); Mat result = imread( "D:/code/map3.png" ); //结果图 //红色的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); //从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); //找圆,最后两个参数是圆半径范围,20是最小圆半径,30是最大圆半径 drawCircle(result, circles); //画圆 namedWindow( "Display window1" , WINDOW_NORMAL); //展示结果 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内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/spy14414/article/details/84644927