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find coordinates after using Houghlinep function

Hi guys i'm new to OpenCV. I'm using opencv to remove lines and get removed coordinates from image. I'm using HoughlineP like this `Mat src = imread("F:/003-00.jpg", IMREAD_GRAYSCALE);

Mat bw;
blur(src, bw, Size(3, 3));
pyrDown(bw, bw);

//threshold(bw, bw, 170, 255, THRESH_BINARY_INV);
Canny(bw, bw, 100, 200, 3);


Mat color_dst = Mat::zeros(bw.size(), CV_8UC1);
vector<Vec4i> lines;

HoughLinesP(bw, lines, 1, CV_PI / 180, 400, 300, 20);
for (size_t i = 0; i < lines.size(); i++)
{

    line(color_dst, Point(lines[i][0], lines[i][1]),
        Point(lines[i][2], lines[i][3]), Scalar(255, 255, 255), 3);

}


imwrite("F:/result.jpg", color_dst);
`

and i got a result image like this image description

but one line actually contains many of child lines and group to one bold line Now I want to erode int get x and y coordinates for every line Thanks for help!