c++ - OpenCV convexity defects drawing -
i have stored defects using convexity defects in 4 element vector integer array using vec4i.
my convex hull array in hull element , contours in contours; want draw line start point of convexity defect end point of one. need access element start index present in vec4i of defects vector!
how do this??
#include <opencv\cv.h> #include <opencv2\highgui\highgui.hpp> #include<opencv\cvaux.h> #include<opencv\cxcore.h> #include <opencv2\imgproc\imgproc.hpp> #include <iostream> #include<conio.h> #include <stdlib.h> using namespace cv; using namespace std; int main(){ mat img, frame, img2, img3; videocapture cam(0); while (true){ cam.read(frame); cvtcolor(frame, img, cv_bgr2hsv); //thresholding inrange(img, scalar(0, 143, 86), scalar(39, 255, 241), img2); imshow("hi", img2); //finding contours vector<vector<point>> contours; vector<vec4i> hier; //morphological transformations erode(img2, img2, getstructuringelement(morph_rect, size(3, 3))); erode(img2, img2, getstructuringelement(morph_rect, size(3, 3))); dilate(img2, img2, getstructuringelement(morph_rect, size(8, 8))); dilate(img2, img2, getstructuringelement(morph_rect, size(8, 8))); //finding contours required findcontours(img2, contours, hier, cv_retr_ccomp, cv_chain_approx_none, point(0, 0)); //finding contour of largest area , storing index int lrgctridx = 0; int maxarea = 0; (int = 0; < contours.size(); i++) { double = contourarea(contours[i]); if (a> maxarea) { maxarea = a; lrgctridx = i; } } //convex hulls vector<vector<point> >hull(contours.size()); vector<vector<vec4i>> defects(contours.size()); (int = 0; < contours.size(); i++) { convexhull(contours[i], hull[i], false); convexitydefects(contours[i], hull[i], defects[i]); } //required contour detected,then convex hell found , convexity defects found , stored in defects if (maxarea>100){ drawcontours(frame, hull, lrgctridx, scalar(255, 255, 255), 1, 8, vector<vec4i>(), 0, point()); \\ drawing required lines joining defects!im facing problem on how acheive since dont know how access elements stored in defects line(frame, \\startindex, \\endindex, \\color, 1); } imshow("output", frame); char key = waitkey(33); if (key == 27) break; } }
also output window shows error when add convexitydefects(..) line think in wrong format! in advance.
convexitydefects needs
convex hull obtained using convexhull() should contain indices of contour points make hull.
that contains more 3 indices. need this:
vector<vector<point> >hull(contours.size()); vector<vector<int> > hullsi(contours.size()); // indices contour points vector<vector<vec4i>> defects(contours.size()); (int = 0; < contours.size(); i++) { convexhull(contours[i], hull[i], false); convexhull(contours[i], hullsi[i], false); if(hullsi[i].size() > 3 ) // need more 3 indices { convexitydefects(contours[i], hullsi[i], defects[i]); } } then drawing part (adapted here):
/// draw convexitydefects (int = 0; < contours.size(); ++i) { for(const vec4i& v : defects[i]) { float depth = v[3] / 256; if (depth > 10) // filter defects depth, e.g more 10 { int startidx = v[0]; point ptstart(contours[i][startidx]); int endidx = v[1]; point ptend(contours[i][endidx]); int faridx = v[2]; point ptfar(contours[i][faridx]); line(frame, ptstart, ptend, scalar(0, 255, 0), 1); line(frame, ptstart, ptfar, scalar(0, 255, 0), 1); line(frame, ptend, ptfar, scalar(0, 255, 0), 1); circle(frame, ptfar, 4, scalar(0, 255, 0), 2); } } } complete code
#include <opencv2\opencv.hpp> #include <iostream> using namespace cv; using namespace std; int main() { mat img, frame, img2, img3; videocapture cam(0); while (true){ cam.read(frame); cvtcolor(frame, img, cv_bgr2hsv); //thresholding inrange(img, scalar(0, 143, 86), scalar(39, 255, 241), img2); imshow("hi", img2); //finding contours vector<vector<point>> contours; vector<vec4i> hier; //morphological transformations erode(img2, img2, getstructuringelement(morph_rect, size(3, 3))); erode(img2, img2, getstructuringelement(morph_rect, size(3, 3))); dilate(img2, img2, getstructuringelement(morph_rect, size(8, 8))); dilate(img2, img2, getstructuringelement(morph_rect, size(8, 8))); //finding contours required findcontours(img2, contours, hier, cv_retr_ccomp, cv_chain_approx_none, point(0, 0)); //finding contour of largest area , storing index int lrgctridx = 0; int maxarea = 0; (int = 0; < contours.size(); i++) { double = contourarea(contours[i]); if (a> maxarea) { maxarea = a; lrgctridx = i; } } //convex hulls vector<vector<point> >hull(contours.size()); vector<vector<int> > hullsi(contours.size()); vector<vector<vec4i>> defects(contours.size()); (int = 0; < contours.size(); i++) { convexhull(contours[i], hull[i], false); convexhull(contours[i], hullsi[i], false); if(hullsi[i].size() > 3 ) { convexitydefects(contours[i], hullsi[i], defects[i]); } } //required contour detected,then convex hell found , convexity defects found , stored in defects if (maxarea>100){ drawcontours(frame, hull, lrgctridx, scalar(2555, 0, 255), 3, 8, vector<vec4i>(), 0, point()); /// draw convexitydefects for(int j=0; j<defects[lrgctridx].size(); ++j) { const vec4i& v = defects[lrgctridx][j]; float depth = v[3] / 256; if (depth > 10) // filter defects depth { int startidx = v[0]; point ptstart(contours[lrgctridx][startidx]); int endidx = v[1]; point ptend(contours[lrgctridx][endidx]); int faridx = v[2]; point ptfar(contours[lrgctridx][faridx]); line(frame, ptstart, ptend, scalar(0, 255, 0), 1); line(frame, ptstart, ptfar, scalar(0, 255, 0), 1); line(frame, ptend, ptfar, scalar(0, 255, 0), 1); circle(frame, ptfar, 4, scalar(0, 255, 0), 2); } } } imshow("output", frame); char key = waitkey(33); if (key == 27) break; } }
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