OpenCV未在图片中检测到圆圈

Question

我遇到问题。我的代码：

#include "opencv2/highgui/highgui.hpp" 
#include "opencv2/imgproc/imgproc.hpp" 
#include <iostream> 
#include <stdio.h> 

using namespace cv; 
using namespace std; 

/** @function main */ 
int main(int argc, char** argv) 
{ 
    Mat src, src_gray; 

    /// Read the image 
    src = imread(argv[1], 1); 

    if(!src.data) 
    { return -1; } 

    /// Convert it to gray 
    cvtColor(src, src_gray, CV_BGR2GRAY); 

    /// Reduce the noise so we avoid false circle detection 
    GaussianBlur(src_gray, src_gray, Size(9, 9), 2, 2); 

    vector<Vec3f> circles; 

    /// Apply the Hough Transform to find the circles 
    HoughCircles(src_gray, circles, CV_HOUGH_GRADIENT, 1, src_gray.rows/8, 200, 100, 0, 0); 

    /// Draw the circles detected 
    for(size_t i = 0; i < circles.size(); i++) 
    { 
     Point center(cvRound(circles[i][0]), cvRound(circles[i][1])); 
     int radius = cvRound(circles[i][2]); 
     // circle center 
     circle(src, center, 3, Scalar(0,255,0), -1, 8, 0); 
     // circle outline 
     circle(src, center, radius, Scalar(0,0,255), 3, 8, 0); 
    } 

    /// Show your results 
    namedWindow("Hough Circle Transform Demo", CV_WINDOW_AUTOSIZE); 
    imshow("Hough Circle Transform Demo", src); 

    waitKey(0); 
    return 0; 
} 

这是来自网站的OpenCV一个例子（http://docs.opencv.org/2.4/doc/tutorials/imgproc/imgtrans/hough_circle/hough_circle.html）

我有以下图：

Image

对于图像上面的代码的OpenCV不检测圆 - circles.size（）等于0。

我该怎么办？什么修改代码？

Answer 1

您使用默认的阈值（200和100），用于从圆显著偏差（太阳火焰）的图像。不是编程错误，只是数据/设置问题。