一、简介
二、画出每个轮廓的每个点
1 #include "opencv2/opencv.hpp" 2 using namespace cv; 3 4 void main() 5 { 6 Mat src=imread("E://22.jpg"); 7 Mat temp=src.clone(); 8 //转灰度图，二值化 9 cvtColor(src,src,CV_BGR2GRAY); 10 threshold(src,src,100,255,THRESH_BINARY); 11 imshow("thres",src); 12 //查找并绘制轮廓 13 vector<vector<Point>>contours; 14 vector<Vec4i>hierarcy; 15 findContours(src,contours,hierarcy,CV_RETR_TREE,CV_LINK_RUNS); 16 /*drawContours(temp,contours,-1,Scalar(0,255,0),2,8); 绘制并显示所有轮廓 17 imshow("contours",temp);*/ 18 19 //绘制轮廓的每一个点 20 for(int i=0; i<contours.size(); i++){ 21 for(int j=0; j<contours[i].size(); j++){ 22 circle(temp,Point(contours[i][j].x,contours[i][j].y),3,Scalar(0,255,0),2,8); 23 } 24 } 25 imshow("contours",temp); 26 waitKey(0); 27 }
轮廓太密集了，稍微改改参数
for(int j=0; j<contours[i].size(); j+=15){ circle(temp,Point(contours[i][j].x,contours[i][j].y),3,Scalar(0,255,0),2,8); }
稍微改改，有另一种效果（动态射线）
1 for(int i=0; i<contours.size(); i++){ 2 for(int j=0; j<contours[i].size(); j+=15){ 3 circle(temp,Point(contours[i][j].x,contours[i][j].y),3,Scalar(0,255,0),2,8); 4 line(temp,Point(10,10),Point(contours[i][j].x,contours[i][j].y), Scalar(0, 0, 255), 1, 8); 5 waitKey(100); 6 imshow("contours", temp); 7 } 8 }
改改又是一种效果
三、孔洞填充
1 #include "opencv2/opencv.hpp" 2 using namespace cv; 3 4 void main() 5 { 6 Mat src=imread("E://33.jpg"); 7 Mat temp=src.clone(); 8 //转灰度图，二值化 9 cvtColor(src,src,CV_BGR2GRAY); 10 threshold(src,src,100,255,THRESH_BINARY); 11 imshow("thres",src); 12 //查找并绘制轮廓 13 vector<vector<Point>>contours; 14 vector<Vec4i>hierarcy; 15 findContours(src,contours,hierarcy,CV_RETR_EXTERNAL,CV_CHAIN_APPROX_NONE); 16 17 ///孔洞填充 18 findContours(src, contours, hierarcy, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE); //查找轮廓 19 drawContours(temp, contours, -1, Scalar(0, 255, 0), -1, 8); //绘制轮廓 20 imshow("contours",temp); 21 waitKey(0); 22 }
稍微改改
