std::vector<:point> resultpoly;
cv::approxPolyDP(contours[0], resultpoly,4, true);//轮廓contours[0] ,resultpoly多边形的点集
cv::polylines(src, resultpoly, true, 150, 1);//画多边形的外轮廓
cv::imshow("detected polyLines", src);//显示多边形的外轮廓
//相关链接https://www.cnblogs.com/donaldlee2008/p/5230032.html
// 移除过小或过大的轮廓
void getSizeContours(vector> &contours)
{
int cmin = 100; // 最小轮廓长度
int cmax = 1000; // 最大轮廓长度
vector>::const_iterator itc = contours.begin();
while(itc != contours.end())
{
if((itc->size()) < cmin || (itc->size()) > cmax)
{
itc = contours.erase(itc);
}
else ++ itc;
}
}
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