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Thank you so much, it totally improved my image by adding this portion
Scharr(blurImage,dx,CV_16S,1,0);
Scharr(blurImage,dy,CV_16S,0,1);
but now, i have intersection points that are close to one another, how do I make it such that I would want to find the intersection point with 3 lines touching an area close to it?