How to make HoughlinesP to detect more lines?

edit

can you add some code and upload the original images without the title bar. Plus from what I am seeing you get the image from canny and pass it to houghTransfomp without any post-processing (e.g. some morphology operation that could strength the edges/lines and give you a more robust result ;-) Moreover, what is your main purpose by detecting the lines (e.g. obtain orientation of bottle, just get the bottle lines, playing around, etc)?

Actually I am using CannyEdge + HoughLinesP

My idea is to find the orientation of the bottle. I tried with other options, actually there is an option to find the orientation of the bottle (Object orientation which appears in http://www.google.de/imgres?imgurl=ht...), however the shadow and reflect of the bottle affects the real orientation of it (So I would need to find an algorithm to detect them)

I will add the photos in my main question.

This is the code

#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"

#include <iostream>

using namespace cv;
using namespace std;

int main(int argc, char** argv)
{
 const char* filename = "/home/diego/Documents/frame0.jpg";

 Mat src = imread(filename, 0);

 Mat dst, cdst;
 Canny(src, dst, 100, 100, 3);
 cvtColor(dst, cdst, CV_GRAY2BGR);

  vector<Vec4i> lines;
  HoughLinesP(dst, lines, 1, CV_PI/180, 2, 50, 10 );
  for( size_t i = 0; i < lines.size(); i++ )
  {
    Vec4i l = lines[i];
    line( cdst, Point(l[0], l[1]), Point(l[2], l[3]), Scalar(0,0,255), 3, CV_AA);
  }

  imshow("original image", src);
  imshow("detected lines", cdst);

 waitKey();

 return 0;
}