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我使用以下代码仅检测圆圈。但它也在检测其他形状。请帮助做到这一点。我使用了 HoughCircles,但它没有给出好的结果。我的要求是只检测圆圈。

Mat src, src_gray;

/// Read the image
src = t2;

if(! src.data )                              // Check for invalid input
{
    cout <<  "Could not open or find the image" << std::endl ;
    cv::waitKey(5000);
}

/// Convert it to gray
cvtColor( src, src_gray, CV_BGR2GRAY );
blur( src_gray, src_gray, Size(3,3) );

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


Mat src_lines; Mat src_gray_lines;
int thresh_lines = 100;
RNG rng_lines(12345);

Mat threshold_output;
vector<vector<Point> > contours;
vector<Vec4i> hierarchy;

src_gray_lines = src_gray;
/// Detect edges using Threshold
threshold( src_gray_lines, threshold_output, thresh_lines, 255, THRESH_BINARY );
/// Find contours
findContours( threshold_output, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, Point(0, 0) );

/// Find the rotated rectangles and ellipses for each contour
vector<RotatedRect> minRect( contours.size() );
vector<RotatedRect> minEllipse( contours.size() );

for( size_t i = 0; i < contours.size(); i++ )
{
    minRect[i] = minAreaRect( Mat(contours[i]) );
}

/// Draw contours + rotated rects + ellipses
Mat drawing = Mat::zeros( threshold_output.size(), CV_8UC3 );
for( size_t i = 0; i< contours.size(); i++ )
{
    // rotated rectangle
    Point2f rect_points[4];
    minRect[i].points( rect_points );
    for( int j = 0; j < 4; j++ )
        line( src, rect_points[j], rect_points[(j+1)%4], Scalar(255,0,0), 1, 8 );
}

如果我的问题不清楚,请告诉我。

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1 回答 1

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您有轮廓向量,因此您可以轻松检查它们的长度。圆也有面积。圆形应该具有特定的面积与长度比率(您应该计算这个比率应该是多少)。现在消除不符合这个比例的形状(有一些增量),你得到的只是圆圈。

于 2012-12-14T07:23:54.247 回答