opencv 轮廓排序

vector >contours ; vector hierarchy; //找到轮廓 findContours(image, contours, hierarchy,CV_RETR_CCOMP ,CV_CHAIN_APPROX_SIMPLE );//查找轮廓//CV_RETR_EXTERNAL 外轮廓 //CV_CHAIN_APPROX_NONE //轮廓上所有点 //CV_RETR_CCOMP 所有轮廓 //CV_CHAIN_APPROX_SIMPLE //轮廓上部分点 //轮廓排序 static inline bool ContoursSortFun(vector contour1,vector contour2) { return (cv::contourArea(contour1) > cv::contourArea(contour2)); } //调用轮廓排序的函数 std::sort(contours.begin(),contours.end(),ContoursSortFun); //画轮廓 drawContours(resultcut, contours, 3, 0,CV_FILLED , 8, hierarchy, 0, Point()); //CV_FILLED//把内轮廓填充 //3,第3个轮廓 //0,黑色