findContours 和 drawContours 的例子:来自 #include "stdafx.h" #include <opencv2/opencv.hpp> using namespace std; using namespace cv; int main( int argc, char** argv ) { Mat src; // the first command-line parameter must be a filename of the binary (black-n-white) image if( argc != 2 || !(src=imread(argv[1], 0)).data) return -1; Mat dst = Mat::zeros(src.rows, src.cols, CV_8UC3); src = src > 50; namedWindow( "Source", 1 ); imshow( "Source", src ); vector<vector<Point> > contours; vector<Vec4i> hierarchy; findContours( src, contours, hierarchy, CV_RETR_CCOMP , CV_CHAIN_APPROX_NONE ); // iterate through all the top-level contours,draw each connected component with its own random color int idx = 0; for( ; idx >= 0; idx = hierarchy[idx][0] ) { Scalar color( rand()&255, rand()&255, rand()&255 ); drawContours( dst, contours, idx, color, CV_FILLED, 8, hierarchy ); } namedWindow( "Components", 1 ); imshow( "Components", dst ); waitKey(0); }
〉按轮廓线,提取图像中闭合区域:findContours,对应的C接口为cvFindContours。 > 加入canny边缘检测,可以得到另一组结果。 结果:
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