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find and drawContours doc

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This commit is contained in:
Gary Bradski 2010-11-24 06:03:21 +00:00
parent 85f301ab9f
commit 1f9171d10a
1 changed files with 21 additions and 4 deletions
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25
samples/cpp/contours2.cpp
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@ -1,9 +1,21 @@
#include "cv.h" #include "cv.h"
#include "highgui.h" #include "highgui.h"
#include <math.h> #include <math.h>
#include <iostream>
using namespace cv; using namespace cv;
void help()
{
cout
<< "This program illustrates the use of findContours and drawContours\n"
<< "The original image is put up along with the image of drawn contours\n"
<< "Usage:\n"
<< "./contours2\n"
<< "\nA trackbar is put up which controls the contour level from -3 to 3\n"
<< endl;
}
const int w = 500; const int w = 500;
int levels = 3; int levels = 3;
@ -20,10 +32,15 @@ void on_trackbar(int, void*)
imshow("contours", cnt_img); imshow("contours", cnt_img);
} }
int main( int, char** ) int main( int argc, char** argv)
{ {
Mat img = Mat::zeros(w, w, CV_8UC1); Mat img = Mat::zeros(w, w, CV_8UC1);
if(argc > 1)
{
help();
return -1;
}
//Draw 6 faces
for( int i = 0; i < 6; i++ ) for( int i = 0; i < 6; i++ )
{ {
int dx = (i%2)*250 - 30; int dx = (i%2)*250 - 30;
@ -55,10 +72,10 @@ int main( int, char** )
ellipse( img, Point(dx+27, dy+100), Size(20,35), 0, 0, 360, white, -1, 8, 0 ); ellipse( img, Point(dx+27, dy+100), Size(20,35), 0, 0, 360, white, -1, 8, 0 );
ellipse( img, Point(dx+273, dy+100), Size(20,35), 0, 0, 360, white, -1, 8, 0 ); ellipse( img, Point(dx+273, dy+100), Size(20,35), 0, 0, 360, white, -1, 8, 0 );
} }
//show the faces
namedWindow( "image", 1 ); namedWindow( "image", 1 );
imshow( "image", img ); imshow( "image", img );
//Extract the contours so that
vector<vector<Point> > contours0; vector<vector<Point> > contours0;
findContours( img, contours0, hierarchy, RETR_TREE, CHAIN_APPROX_SIMPLE); findContours( img, contours0, hierarchy, RETR_TREE, CHAIN_APPROX_SIMPLE);