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for hough line code is -: HoughLinesP(dst,lines,1,CV_PI/180,80,30,10); now make a conditional statement like-: if( theta>CV_PI/180170 || theta<cv_pi 180<="" em="">10) { Point pt1, pt2; .......... line( cdst, pt1, pt2, Scalar(0,0,255), 3, CV_AA); } this while restrict the scope of detected lines and then you will be able to show your horizontal lines only.

for hough line code is -: HoughLinesP(dst,lines,1,CV_PI/180,80,30,10); HoughLinesP(dst,lines,1,CV_PI/180,80,30,10); now make a conditional statement like-: like-:

if( theta>CV_PI/180170 theta>CV_PI/180*170 || theta<cv_pi 180<="" em="">10)
    theta<CV_PI/180*10)
    { Point pt1, pt2;
     ..........
     line( cdst, pt1, pt2, Scalar(0,0,255), 3, CV_AA);
     }

this while restrict the scope of detected lines and then you will be able to show your horizontal lines only.