opencv3计算轮廓的长度-arcLength函数

#include
#include
#include

using namespace cv;
using namespace std;

int main()
{
	//首先确定构成轮廓的点集
	vector g_vsrcPoints;
	//向容器内存储点的坐标
	g_vsrcPoints.push_back(Point2f(1, 1));
	g_vsrcPoints.push_back(Point2f(2, 2));
	g_vsrcPoints.push_back(Point2f(1, 2));
	g_vsrcPoints.push_back(Point2f(3, 1));

	//计算轮廓的矩
	double dstLength = arcLength(g_vsrcPoints, true);

	cout << "【原始轮廓的长度为：】" << dstLength << endl;

	//利用曲线逼近，计算逼近曲线的长度
	//首先创建一个逼近曲线
	vector approx;
	approxPolyDP(g_vsrcPoints, approx, 2, true);
	//接着计算得到的逼近曲线的长度
	dstLength = arcLength(approx, true);
	cout << "【逼近曲线围成的轮廓的长度为：】" << dstLength << endl;

	return 0;
}