@Witek, @zerog80,
Hi
I am beginner to opencv, I tried upto find mask.
My code goes here:
include "opencv2/highgui/highgui.hpp"
include "opencv2/imgproc/imgproc.hpp"
include <iostream>
using namespace std;
using namespace cv;
int main( ){
Mat src1;
Mat src=imread("img.png",1);
Mat thr,gray;
cvtColor(src,gray,CV_BGR2GRAY);
//adaptiveThreshold(gray,thr,255,ADAPTIVE_THRESH_MEAN_C, THRESH_BINARY,99,7);
threshold(gray, thr, 0, 255, CV_THRESH_BINARY | CV_THRESH_OTSU);
namedWindow( "gryimage", 1 );
imshow( "gryimage", thr);
vector< vector <point> > contours; // Vector for storing contour
vector< Vec4i > hierarchy;
int largest_contour_index=0;
int largest_area=0;
Mat mask(src.rows,src.cols,CV_8UC1,Scalar::all(0)); //create destination image
findContours( thr.clone(), contours, hierarchy,CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE ); // Find the contours in the image
for( int i = 0; i< contours.size(); i++ ) // iterate through each contour.
{
double a=contourArea( contours[i],false); // Find the area of contour
if(a>largest_area){
largest_area=a;
largest_contour_index=i; //Store the index of largest contour
}
}
vector<vector<point> >hull(1);
convexHull(contours[largest_contour_index], hull[0],false,true );
drawContours( mask, hull, 0, Scalar(125), -1, 8, vector<vec4i>(), 0, Point() );
namedWindow( "mask Image", 1 );
imshow( "mask Image", mask );
waitKey(0);
return 0;
}
My question is how to find angle by using corner points ?
