opencv轮廓提取与轮廓拟合.doc

opencv轮廓提取与轮廓拟合#include #include #include #include #include using namespace std;using namespace cv;int main()/ Read input binary image Mat image= imread(./binaryGroup.bmp,0); if (!image.data)return 0; namedWindow(Binary Image); imshow(Binary Image,image);/ Get the contours of the connected components vectorvector contours; /findContours的输入是二值图像 findContours(image, contours, / a vector of contours CV_RETR_EXTERNAL, / retrieve the external contoursCV_CHAIN_APPROX_NONE); / retrieve all pixels of each contours/ Print contours length轮廓的个数 cout Contours: contours.size() endl; vectorvector:const_iterator itContours= contours.begin();for ( ; itContours!=contours.end(); +itContours) cout Size: size() endl;/每个轮廓包含的点数/ draw black contours on white image Mat result(image.size(),CV_8U,Scalar(0); drawContours(result,contours, /画出轮廓-1, / draw all contoursScalar(255), / in black2); / with a thickness of 2namedWindow(Contours);imshow(Contours,result);/ Eliminate too short or too long contoursint cmin= 100; / minimum contour lengthint cmax= 1000; / maximum contour lengthvectorvector:const_iterator itc= contours.begin();while (itc!=contours.end() if (itc-size() size() cmax)itc= contours.erase(itc);else +itc;/ draw contours on the original imageMat original= imread(./group.bmp);drawContours(original,contours,-1, / draw all contoursScalar(255,255,255), / in white2); / with a thickness of 2namedWindow(Contours on Animals);imshow(Contours on Animals,original);/ Lets now draw black contours on white image/result.setTo(Scalar(0);/If the third parameter of this function is a negative value, then all contours are drawn./Otherwise, it is possible to specify the index of the contour to be drawndrawContours(result,contours,-1, / draw all contoursScalar(255), / in black1); / with a thickness of 1image= imread(./binaryGroup.bmp,1);/ testing the bounding box Rect r0= boundingRect(Mat(contours0);/boundingRect获取这个外接矩形rectangle(result,r0,Scalar(255,255,255),2);/ testing the enclosing circle float radius;Point2f center;minEnclosingCircle(Mat(contours1),center,radius);/对轮廓进行多变形逼近circle(result,Point(center),static_cast(radius),Scalar(255),2);RotatedRect rrect= fitEllipse(Mat(contours2);ellipse(result,rrect,Scalar(255),2); /testing the approximate polygonvector poly;approxPolyDP(Mat(contours2),poly,5,true);cout Polygon size: poly.size() endl;/ Iterate over each segment and draw itvector:const_iterator itp= poly.begin();while (itp!=(poly.end()-1) line(result,*itp,*(itp+1),Scalar(255),2);+itp;/ last point linked to first pointline(result,*(poly.begin(),*(poly.end()-1),Scalar(20),2);/ testing the convex hullvector hull;convexHull(Mat(contours3),hull);/ Iterate over each segment and draw itvector:const_iterator it= hull.begin();while (it!=(hull.end()-1) line(result,*it,*(it+1),Scalar(255),2);+it;/ last point linked to first pointline(result,*(hull.begin(),*(hull.end()-1),Scalar(255),2);/ testing the moments/iterate over all contoursitc= contours.begin();while (itc!=contours.end() / compute all momentsMoments mom= moments(Mat(*itc+);/ draw mass centercircle(result,/ position of mass center converted to integerPoint(mom.m10/mom.m00,mom.m01/mom.m00),2,Scalar(255),2); / draw black dotnamedWindow(Some Shape descriptors);imshow(Some Shape descriptors,result);/ New call to findContours but with CV_RETR_LIST flagimage= imread(./binaryGroup.bmp,0);/ Get the contours of the connected componentsfindContours(image, contours, / a vector of contours CV_RETR_LIST, / retrieve the external and internal contoursCV_CHAIN_APPROX_NONE); / retrieve all pixels of each contours/ draw black contours on white imageresult.setTo(Scalar(0);drawContours(result,contours,-1, / draw all contou