ofxCv CounourFinder get center points

ofApp.cpp

#include "ofApp.h"

using namespace ofxCv;
using namespace cv;

void ofApp::setup() {
    cam.initGrabber(ofGetWidth(), ofGetHeight());
    contourFinder.setMinAreaRadius(10);
    contourFinder.setMaxAreaRadius(200);
}

void ofApp::update() {
    cam.update();
    if(cam.isFrameNew()) {
        contourFinder.setThreshold(ofMap(mouseX, 0, ofGetWidth(), 0, 255));
        contourFinder.findContours(cam);
    }
}

void ofApp::draw() {
    ofSetColor(255);
    cam.draw(0, 0);
    contourFinder.draw();
    // 検出された輪郭線の数だけくりかえし
    for (int i = 0; i < contourFinder.size(); i++) {
        // 中心点抽出
        cv::Point2f pos = contourFinder.getCenter(i);
        // 円を描画
        ofSetColor(255, 0, 0);
        ofCircle(pos.x, pos.y, 5);
    }
}

ofApp.h

#pragma once

#include "ofMain.h"
#include "ofxCv.h"

class ofApp : public ofBaseApp {
public:
	void setup();
	void update();
	void draw();
	
	ofVideoGrabber cam;
	ofxCv::ContourFinder contourFinder;
};