hello,

I an using this code for hough line `#include "opencv2/highgui/highgui.hpp"

include "opencv2/imgproc/imgproc.hpp"

include <iostream>

using namespace cv; using namespace std; Mat frame; int main() { Mat src = imread("building.jpg", 0);

Mat dst, cdst;

Canny(src, dst, 50, 200, 3); 
cvtColor(dst, cdst, CV_GRAY2BGR); 

vector<Vec2f> lines;
// detect lines
HoughLines(dst, lines, 1, CV_PI/180, 150, 0, 0 );

// draw lines
for( size_t i = 0; i < lines.size(); i++ )
{

    float rho = lines[i][0], theta = lines[i][1];

            if( theta>CV_PI/180*170 || theta<CV_PI/180*10)
    {
    Point pt1, pt2;

    double a = cos(theta), b = sin(theta);
    double x0 = a*rho, y0 = b*rho;

    pt1.x = cvRound(x0 + 1000*(-b));
    pt1.y = cvRound(y0 + 1000*(a));
    pt2.x = cvRound(x0 - 1000*(-b));
    pt2.y = cvRound(y0 - 1000*(a));


    line( src, pt1, pt2, Scalar(0,0,255), 3, CV_AA);
    }

}

imshow("source", src;
imshow("detected lines", cdst);

waitKey();
return 0;

}`

I want line aroung the tube only and other i don't want. the width of tube is aroung 46 pixel, from the frame. is there any suggestions how to detect the desired line.

Thank you very much in advance.

hello,

I an using this code for hough line `#include "opencv2/highgui/highgui.hpp"

include "opencv2/imgproc/imgproc.hpp"

include <iostream>

using namespace cv; using namespace std; Mat frame; int main() { Mat src = imread("building.jpg", 0);

Mat dst, cdst;

Canny(src, dst, 50, 200, 3); 
cvtColor(dst, cdst, CV_GRAY2BGR); 

vector<Vec2f> lines;
// detect lines
HoughLines(dst, lines, 1, CV_PI/180, 150, 0, 0 );

// draw lines
for( size_t i = 0; i < lines.size(); i++ )
{

    float rho = lines[i][0], theta = lines[i][1];

            if( theta>CV_PI/180*170 || theta<CV_PI/180*10)
    {
    Point pt1, pt2;

    double a = cos(theta), b = sin(theta);
    double x0 = a*rho, y0 = b*rho;

    pt1.x = cvRound(x0 + 1000*(-b));
    pt1.y = cvRound(y0 + 1000*(a));
    pt2.x = cvRound(x0 - 1000*(-b));
    pt2.y = cvRound(y0 - 1000*(a));


    line( src, pt1, pt2, Scalar(0,0,255), 3, CV_AA);
    }

}

imshow("source", src;
imshow("detected lines", cdst);

waitKey();
return 0;

}`

I want line aroung the tube only and other i don't want. the width of tube is aroung 46 pixel, from the frame. is there any suggestions how to detect the desired line.

Thank you very much in advance.

hello,

I an using this code for hough line `#include "opencv2/highgui/highgui.hpp"

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

using namespace cv;
using namespace std;
Mat frame;
int main()
{
   Mat src = imread("building.jpg", 0); 
 
 Mat dst, cdst;

 Canny(src, dst, 50, 200, 3); 
 cvtColor(dst, cdst, CV_GRAY2BGR); 

 vector<Vec2f> lines;
 // detect lines
 HoughLines(dst, lines, 1, CV_PI/180, 150, 0, 0 );

 // draw lines
 for( size_t i = 0; i < lines.size(); i++ )
 {

     float rho = lines[i][0], theta = lines[i][1];

             if( theta>CV_PI/180*170 || theta<CV_PI/180*10)
     {
     Point pt1, pt2;

     double a = cos(theta), b = sin(theta);
     double x0 = a*rho, y0 = b*rho;

     pt1.x = cvRound(x0 + 1000*(-b));
     pt1.y = cvRound(y0 + 1000*(a));
     pt2.x = cvRound(x0 - 1000*(-b));
     pt2.y = cvRound(y0 - 1000*(a));


     line( src, pt1, pt2, Scalar(0,0,255), 3, CV_AA);
     }

 }

 imshow("source", src;
 imshow("detected lines", cdst);

 waitKey();
 return 0;
}
 
}` 
I want line aroung the tube only and other i don't want.
the width of tube is aroung 46 pixel, from the frame.
is there any suggestions how to detect the desired line.
 
Thank you very much in advance.