[英]how to detect circle in image with openCV?
我想檢測圖像中的圓圈。這是我嘗試檢測此圖像中的圓圈數的代碼:
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <stdio.h>
/** @function main */
int main(int argc, char** argv)
{
//load image from directory
IplImage* gray = cvLoadImage("comb.png",0);
// IplImage* gray = cvCreateImage(cvGetSize(img), IPL_DEPTH_8U, 1);
CvMemStorage* storage = cvCreateMemStorage(0);
//covert to grayscale
cvCvtColor(gray, gray, CV_RGB2GRAY);
// This is done so as to prevent a lot of false circles from being detected
cvSmooth(gray, gray, CV_GAUSSIAN, 7, 7);
IplImage* canny = cvCreateImage(cvGetSize(gray),IPL_DEPTH_8U,1);
//IplImage* rgbcanny = cvCreateImage(cvGetSize(gray),IPL_DEPTH_8U,3);
cvCanny(gray, canny, 10, 20, 3);
//detect circles
CvSeq* circles = cvHoughCircles(gray, storage, CV_HOUGH_GRADIENT, 1, gray->width/10);
if(circles->total>0)
printf("circles found: %d\n",circles->total);
else
printf("circles not found");
return 0;
}
但是發生以下錯誤:-OpenCV錯誤:cvCvtColor文件/OpenCV/OpenCV-2.4.3/modules/imgproc/src/color.cpp在行3811終止后斷言失敗(dst.data == dst0.data)拋出'cv :: Exception'what()的實例what():/OpenCV/OpenCV-2.4.3/modules/imgproc/src/color.cpp:3811:錯誤:(-215)dst.data == dst0.data在函數cvCvtColor
請告訴我程序有什么問題。我正在使用ubuntu linux。
打開gray
作為灰色圖像( cvLoadImage("comb.png",0)
,其中“ 0”表示“灰度”)。 然后,您嘗試將此灰度框架從RGB轉換為Gray,當然這將無法工作,因為您的圖像已經是灰度的。
只需嘗試注釋掉以下行:
//covert to grayscale
cvCvtColor(gray, gray, CV_RGB2GRAY);
順便說一句,你應該使用
IplImage* gray = cvLoadImage("comb.png", CV_LOAD_IMAGE_GRAYSCALE);
代替
IplImage* gray = cvLoadImage("comb.png", 0);
那更清楚了。
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