Opencv-image Components

# Include "opencv2/highgui. HPP "# include" opencv2/imgproc. HPP "# include <iostream> # include <stdio. h> # include <stdlib. h> using namespace CV; using namespace STD; mat src; MAT src_gray; int thresh = 100; int max_thresh = 255; RNG (12345 ); // function declaration void thresh_callback (INT, void *); int main (INT argc, char ** argv) {// load the color image, convert to a grayscale image and blur src = imread (argv [1], 1); cvtcolor (SRC, src_gray, cv_bgr2gray); blur (src_gray, src_gray, size (3, 3 )); // create a window char * source_window = "Source"; namedwindow (source_window, cv_window_autosize); imshow (source_window, Src); createtrackbar ("kan thresh:", "Source ", & Thresh, max_thresh, thresh_callback); thresh_callback (0, 0); waitkey (0); Return (0);} void thresh_callback (INT, void *) {mat canny_output; vector <vector <point> contours; vector <vec4i> hierarchy; // The CTR (src_gray, canny_output, thresh, thresh * 2, 3 ); // search for the image contour findcontours (canny_output, contours, hierarchy, cv_retr_tree, cv_chain_approx_simple, point (0, 0); // obtain the component vector <moments> Mu (contours. size (); For (INT I = 0; I <contours. size (); I ++) {Mu [I] = moments (ments s [I], false);} // obtain the mass center vector <point2f> MC (contours. size (); For (INT I = 0; I <contours. size (); I ++) {Mc [I] = point2f (MU [I]. m10/mu [I]. m00, Mu [I]. m01/mu [I]. m00);} // draw the contour mat drawing = mat: zeros (canny_output.size (), cv_8uc3); For (INT I = 0; I <contours. size (); I ++) {scalar color = scalar (RNG. uniform (0,255), RNG. uniform (0,255), RNG. uniform (0,255); drawcontours (drawing, contours, I, color, 2, 8, hierarchy, 0, point (); Circle (drawing, MC [I], 4, color,-1, 8, 0);} // display the result namedwindow ("s", cv_window_autosize); imshow ("contours", drawing ); // calculate the area with the moments 00 and compare with the result of the opencv function printf ("\ t info: area and contour length \ n "); for (INT I = 0; I <contours. size (); I ++) {printf ("* contour [% d]-area (m_00) = %. 2f-area opencv: %. 2f-length: %. 2f \ n ", I, Mu [I]. m00, metrics area (S [I]), arclength (contours [I], true); scalar color = scalar (RNG. uniform (0,255), RNG. uniform (0,255), RNG. uniform (0,255); drawcontours (drawing, contours, I, color, 2, 8, hierarchy, 0, point (); Circle (drawing, MC [I], 4, color,-1, 8, 0 );}}