c++ - How to filter only the longest line after Hough Transform -


i'm using hough transform straight lines. there lot of lines detected. can know how filter , longest line output?

      houghlinesp(dst, lines, 1, cv_pi/180, 50, 20, 10 ); //left lane        for( size_t = 0; < lines.size(); i++ )       {         vec4i l = lines[i];         double theta1,theta2, hyp, result;          theta1 = (l[3]-l[1]);         theta2 = (l[2]-l[0]);         hyp = hypot(theta1,theta2);          line( cdst, point(l[0], l[1]), point(l[2], l[3]), scalar(255,0,0), 3, cv_aa);          }        imshow("detected lines", cdst);

}

as far can see, you're literally step away:

the hypot function gives distance between start , end points. now, find longest such distance, , corresponding line longest.

vec4i max_l; double max_dist = -1.0;  for( size_t = 0; < lines.size(); i++ ) {     vec4i l = lines[i];     double theta1,theta2, hyp, result;      theta1 = (l[3]-l[1]);     theta2 = (l[2]-l[0]);     hyp = hypot(theta1,theta2);      if (max_dist < hyp) {         max_l = l;         max_dist = hyp;     }            }  // max_l has line of maximum length line( cdst, point(max_l[0], max_l[1]), point(max_l[2], max_l[3]), scalar(255,0,0), 3, cv_aa); // else max_l

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