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centroid.cpp
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centroid.cpp
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#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
using namespace cv;
using namespace std;
//RNG rng(12345);
void find_moments( Mat output );
int main( )
{
/// Load source image, convert it to gray and blur it
Mat src, gray;;
src = imread("U64_res.png", 1 );
// cvtColor( src, gray, CV_BGR2GRAY );
// blur( gray, gray, Size(3, 3) );
Mat output;
cv::inRange(src, cv::Scalar(255, 0, 0), cv::Scalar(255, 0, 0), output);
cv::imshow("output", output);
namedWindow( "Source", CV_WINDOW_AUTOSIZE );
imshow( "Source", src );
find_moments( output );
waitKey(0);
return(0);
}
void find_moments( Mat output)
{
Mat canny_output;
vector<vector<Point> > contours;
vector<Vec4i> hierarchy;
/// Detect edges using canny
Canny( output, canny_output, 100, 150, 3 );
/// Find contours
findContours( canny_output, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, Point(0, 0) );
/// Get the moments
vector<Moments> mu(contours.size() );
for( int i = 0; i < contours.size(); i++ )
{
mu[i] = moments( contours[i], false );
}
/// Get the mass centers:
vector<Point2f> mc( contours.size() );
for( int i = 0; i < contours.size(); i++ )
{
mc[i] = Point2f( mu[i].m10/mu[i].m00 , mu[i].m01/mu[i].m00 );
}
/// Draw contours
Mat drawing = Mat::zeros( canny_output.size(), CV_8UC3 );
for( int i = 0; i< contours.size(); i++ )
{
//Scalar color = Scalar( rng.uniform(0, 255), rng.uniform(0,255), rng.uniform(0,255) );
drawContours( drawing, contours, i, Scalar(255, 0, 0), 2, 8, hierarchy, 0, Point() );
circle( drawing, mc[i], 4, Scalar(0, 0, 255), -1, 8, 0 );
}
/// Show in a window
namedWindow( "Contours", CV_WINDOW_AUTOSIZE );
imshow( "Contours", drawing );
/// Calculate the area with the moments 00 and compare with the result of the OpenCV function
printf("\t Info: Area and Contour Length \n");
for( int i = 0; i< contours.size(); i++ )
printf(" * Contour[%d] - Area (M_00) = %.2f - Area OpenCV: %.2f - Length: %.2f \n", i, mu[i].m00, contourArea(contours[i]), arcLength( contours[i], true ) );
}