获取最大轮廓 opencv

opencv3计算图像中轮廓的面积http://blog.youkuaiyun.com/qq_23880193/article/details/49256999

http://blog.youkuaiyun.com/davebobo/article/details/52583167

#include<iostream>    
#include <opencv2/core/core.hpp>      
#include <opencv2/highgui/highgui.hpp>   
#include<imgproc/imgproc.hpp>    

using namespace std;  
using namespace cv;  

int main(){  

    Mat image = cvLoadImage("