Question

【opencv+VS】图片中找圆

我采集一幅图片，jpf、png都行，然后转成YUV422格式，找图片中的圆，opencv怎么实现呢？

Answer 1

#include <cv.h>
#include <highgui.h>
#include <math.h>

int main(int argc, char** argv)
{
IplImage* img = cvCreateImage = cvLoadImage("img.jpg");
if(img)
{
IplImage* gray = cvCreateImage(
cvGetSize(img), 8, 1 );
CvMemStorage* storage =
cvCreateMemStorage(0);
cvCvtColor( img, gray, CV_BGR2GRAY
);
cvSmooth( gray, gray, CV_GAUSSIAN,
9, 9 ); // smooth it, otherwise a lot of false circles //may be detected
CvSeq* circles = cvHoughCircles(
gray, storage, CV_HOUGH_GRADIENT, 2, gray->height/4, 200, 100 );
int i;
for( i = 0; i <
circles->total; i++ )
{
float*
p = (float*)cvGetSeqElem( circles, i );

cvCircle( img, cvPoint(cvRound(p[0]),cvRound(p[1])), 3, CV_RGB(0,255,0), -1, 8,
0 );

cvCircle( img, cvPoint(cvRound(p[0]),cvRound(p[1])), cvRound(p[2]),
CV_RGB(255,0,0), 3, 8, 0 );
}
cvNamedWindow( "circles",
1 );
cvShowImage( "circles",
img );
cvWaitKey(0);
}
return 0;
}

这是未转换成yuv格式的，将输入的图像灰度化进行处理
如果想要转成yuv格式，调用cvCvtColor(img,yuv,CV_BGR2YUV);即可得到yuv格式图像，其中的y分量即为灰度图