[php]
#include <iostream>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/opencv.hpp>

using namespace cv ;
using namespace std ;

int main() {

Mat src_gray;
cv::Mat src = cv::imread("/Users/powenko/Desktop/1.png");
if(src.data!=NULL){

///////////////////////
Mat img(500, 500, CV_8UC3);
RNG& rng = cv::theRNG();

cout << "\n這個程序演示了凸包函數的使用，任意給定一些點，求出包圍這些點的凸包\n" <<endl;

char key;
int i, count = 100; //(unsigned)rng%100 + 1;

vector<Point> points;
//隨機在1-100個點，這些點位於圖像中心3/4處。
for( i = 0; i < count; i++ )
{
Point pt;
pt.x = rng.uniform(img.cols/4, img.cols*3/4);
pt.y = rng.uniform(img.rows/4, img.rows*3/4);

points.push_back(pt);
}

//計算凸包
vector<int>hull;
convexHull(Mat(points), hull, true);

//畫隨機點
img = Scalar::all(0);
for( i = 0; i < count; i++ )
circle(img, points[i], 3, Scalar(0, 0, 255), CV_FILLED, CV_AA);

int hullcount = (int)hull.size();
Point pt0 = points[hull[hullcount-1]];
//畫凸包
for( i = 0; i < hullcount; i++ )
{
Point pt = points[hull[i]];
line(img, pt0, pt, Scalar(0, 255, 0), 1, CV_AA);
pt0 = pt;
}

///////////////////////

cv::namedWindow("Image") ;
cv::imshow("result", img) ;
cv::waitKey() ;
}
return 0;
}

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