Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
#include <opencv2/highgui.hpp>
#include <opencv2/imgproc.hpp>
using namespace cv;
using namespace std;
// calculates distance between two points
static double distanceBtwPoints(const cv::Point a, const cv::Point b)
{
double xDiff = a.x - b.x;
double yDiff = a.y - b.y;
return std::sqrt((xDiff * xDiff) + (yDiff * yDiff));
}
static int findNearestPointIndex(const cv::Point pt, const vector<Point> points)
{
int nearestpointindex = 0;
double distance;
double mindistance = 1e+9;
for ( size_t i = 0; i < points.size(); i++)
{
distance = distanceBtwPoints(pt,points[i]);
if( distance < mindistance )
{
mindistance = distance;
nearestpointindex = i;
}
}
return nearestpointindex;
}
int main( int argc, char** argv )
{
Point pt0;
int shift=0; // optional value for drawing scaled
Scalar color = Scalar(0,0,0);
char* filename = argc >= 2 ? argv[1] : (char*)"test.png";
Mat img = imread(filename);
if (img.empty())
return -1;
Mat src = img;
Mat bw;
cvtColor( src, bw, COLOR_BGR2GRAY );
bw = bw < 127;
// Find contours
vector<vector<Point> > contours;
vector<Point> contour;
findContours( bw, contours, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_NONE );
// assuming the closed contour have biggest size
contour = contours[0];
for ( size_t i = 0; i < contours.size(); i++)
{
if( contour.size() < contours[i].size() )
contour = contours[i];
}
for ( size_t i = 0; i < contours.size(); i++)
{
if( contour != contours[i] && contours[i].size() > 10 )
{
for ( size_t j = 0; j < contours[i].size(); j++)
{
pt0 = contours[i][j];
line(src,pt0,contour[findNearestPointIndex(pt0,contour)],color,1,LINE_8,shift);
}
}
}
cvtColor( src, src, COLOR_BGR2GRAY );
src = src < 127;
vector<vector<Point> > contours1;
findContours( src, contours1, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE );
src = 255; // clears source image to redraw
for ( size_t i = 0; i < contours1.size(); i++)
{
drawContours(src,contours1,i,color);
}
imwrite("result1.png",src);
Mat m_xor(src.size(),CV_8UC1,255);
polylines(m_xor,contour,false,color,1,LINE_8);
m_xor = 255 - (src ^ m_xor) ;
imwrite("result2.png",m_xor);
imshow("result2", m_xor);
waitKey(0);
return 0;
}
@sturkmen72

This comment has been minimized.

Copy link
Owner Author

@sturkmen72 sturkmen72 commented Sep 15, 2015

here is result image of input image : https://dl.dropboxusercontent.com/u/710615/OriginalImage.jpg
70629-result2

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.