cvHoughCircles.cpp

//
//  cvHoughCircles.cpp
//  LearningOpenCV
//
//  Created by YourtionGuo on 7/28/16.
//  Copyright © 2016 Yourtion. All rights reserved.
//

#include <iostream>
#include <highgui.h>
#include <cv.h>

int main(int argc, const char * argv[]) {
    
    IplImage* image = cvLoadImage(argv[1], CV_LOAD_IMAGE_GRAYSCALE);
    
    CvMemStorage* storage = cvCreateMemStorage(0);
    cvSmooth(image, image, CV_GAUSSIAN, 5, 5);
    
    CvSeq* results = cvHoughCircles( image, storage, CV_HOUGH_GRADIENT, 2, image->width/10 );
    
    for ( int i = 0; i < results->total ; i++ ) {
        float* p = (float *) cvGetSeqElem( results, i);
        CvPoint pt = cvPoint( cvRound(p[0]), cvRound(p[1]) );
        cvCircle(image, pt, cvRound(p[2]), CV_RGB(0xff, 0xff, 0xff));
    }
    cvNamedWindow( "cvHoughCircles", 1 );
    cvShowImage( "cvHoughCircles", image );
    cvWaitKey(0);
    
    return 0;
}