Verybot之OpenCV应用二：霍夫变换查找圆

其实我是想通过这个程序来测试一下，OpenCV在Verybot上跑得怎么样，霍夫变换的原理就不多说了，下面是程序：

#include "cv.h"
#include "highgui.h"
#include "stdio.h"

int main(int argc, char** argv)
{
cvNamedWindow("vedio",0);
CvCapture* capture;
if(1 == argc)
{
capture = cvCreateCameraCapture(0);
}
else
{
capture = cvCreateCameraCapture(atoi(argv[1]));
}

assert(NULL != capture);

cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH, 320);

cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT,240);

IplImage* frame;

char keyCode;

frame = cvQueryFrame(capture);

if(!frame)
{
return 0;
}

IplImage* gray = cvCreateImage( cvGetSize(frame), 8, 1 );    //创建一个Image用来存灰度的图像

CvMemStorage* storage = cvCreateMemStorage(0);

while((keyCode = cvWaitKey(15)))
{
if(keyCode == 'q')
{
break;
}
frame = cvQueryFrame(capture);
if(!frame)
{
break;
}

cvCvtColor( frame, gray, CV_BGR2GRAY );

CvSeq* circles = cvHoughCircles( gray, storage, CV_HOUGH_GRADIENT, 2, gray->height/4,200,200,20 );    //霍夫变换查找圆

int i=0;

for( i = 0; i < circles->total; i++ )        //将找到的圆标识出来

{

float* p = (float*)cvGetSeqElem( circles, i );

cvCircle( frame, cvPoint(cvRound(p[0]),cvRound(p[1])), cvRound(p[2]), CV_RGB(255,0,0),3);

printf("%d  ,%d  ,%d\n",cvRound(p[0]),cvRound(p[1]),cvRound(p[2]));
}

cvShowImage("vedio",frame);
}

cvReleaseImage(&frame);
cvDestroyAllWindows();
return 0;
}

程序比较简单，cvHoughCircles就是查找圆所使用的函数，后面的这几个参数比较重要，需要根据实际情况进行调整，调整不好的话，会误检测出圆来。

测试的效果感觉还是不错的，下面是一个检测的录像：
http://v.youku.com/v_show/id_XNjYxNjkzNDMy.html