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{
#include "opencv2/highgui/highgui.hpp"
// highgui - an interface to video and image capturing.
#include "opencv2/imgproc/imgproc.hpp"
// imgproc - An image processing module that for linear and non-linear
//image filtering, geometrical image transformations, color space conversion and so on.
#include <iostream>
#include <stdio.h>
#include <vector>
// The header files for performing input and output.
using namespace cv;
// Namespace where all the C++ OpenCV functionality resides.
using namespace std;
// For input output operations.
int main()
{
Mat image;
// Mat object is a basic image container. image is an object of Mat.
image = imread("coin-detection.jpg", COLOR_BGR2GRAY);
// Take any image but make sure its in the same folder.
// first argument denotes the image to be loaded.
// second argument specifies the image format as follows:
// CV_LOAD_IMAGE_UNCHANGED (<0) loads the image as it is.
// CV_LOAD_IMAGE_GRAYSCALE ( 0) loads the image in Gray scale.
// CV_LOAD_IMAGE_COLOR (>0) loads the image in the BGR format.
// If the second argument is not there, it is implied CV_LOAD_IMAGE_COLOR.
std::vector<int> coin;
// A vector data type to store the details of coins.
HoughCircles(image, coin, cv::HOUGH_GRADIENT, 2, 20, 450, 60, 0, 0);
// Argument 1: Input image mode
// Argument 2: A vector that stores 3 values: x,y and r for each circle.
// Argument 3: CV_HOUGH_GRADIENT: Detection method.
// Argument 4: The inverse ratio of resolution.
// Argument 5: Minimum distance between centers.
// Argument 6: Upper threshold for Canny edge detector.
// Argument 7: Threshold for center detection.
// Argument 8: Minimum radius to be detected. Put zero as default
// Argument 9: Maximum radius to be detected. Put zero as default
int l = coin.size();
// Get the number of coins.
cout << "\n The number of coins is: " << l << "\n\n";
// To draw the detected circles.
for (size_t i = 0; i < coin.size(); i++)
{
Point center(cvRound(coin[i][0]), cvRound(coin[i][1]));
// Detect center
// cvRound: Rounds floating point number to nearest integer.
int radius = cvRound(coin[i][2]);
// To get the radius from the second argument of vector coin.
circle(image, center, 3, Scalar(0, 255, 0), -1, 8, 0);
// circle center
// To get the circle outline.
circle(image, center, radius, Scalar(0, 0, 255), 3, 8, 0);
// circle outline
cout << " Center location for circle " << i + 1 <<
center << "\n" Diameter: << 2 * radius << "\n";
}
cout << "\n";
namedWindow("Coin Counter", cv::WINDOW_AUTOSIZE);
// Create a window called
//"A_good_name".
// first argument: name of the window.
// second argument: flag- types:
// WINDOW_NORMAL : The user can resize the window.
// WINDOW_AUTOSIZE : The window size is automatically adjusted to fit the
// displayed image() ), and you cannot change the window size manually.
// WINDOW_OPENGL : The window will be created with OpenGL support.
imshow("Coin Counter", image);
// first argument: name of the window
// second argument: image to be shown(Mat object)
waitKey(0); // Wait for infinite time for a key press.
return 0; // Return from main function.
}
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