From 1f9171d10adcf42a3c656f4b42fc07776320dcdc Mon Sep 17 00:00:00 2001
From: Gary Bradski <no@email>
Date: Wed, 24 Nov 2010 06:03:21 +0000
Subject: [PATCH] find and drawContours doc
---
samples/cpp/contours2.cpp | 25 +++++++++++++++++++++----
1 file changed, 21 insertions(+), 4 deletions(-)
diff --git a/samples/cpp/contours2.cpp b/samples/cpp/contours2.cpp
index 640ed97453..1d5806b96c 100644
--- a/samples/cpp/contours2.cpp
+++ b/samples/cpp/contours2.cpp
@@ -1,9 +1,21 @@
#include "cv.h"
#include "highgui.h"
#include <math.h>
+#include <iostream>
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;
int levels = 3;
@@ -20,10 +32,15 @@ void on_trackbar(int, void*)
imshow("contours", cnt_img);
}
-int main( int, char** )
+int main( int argc, char** argv)
{
Mat img = Mat::zeros(w, w, CV_8UC1);
-
+ if(argc > 1)
+ {
+ help();
+ return -1;
+ }
+ //Draw 6 faces
for( int i = 0; i < 6; i++ )
{
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+273, dy+100), Size(20,35), 0, 0, 360, white, -1, 8, 0 );
}
-
+ //show the faces
namedWindow( "image", 1 );
imshow( "image", img );
-
+ //Extract the contours so that
vector<vector<Point> > contours0;
findContours( img, contours0, hierarchy, RETR_TREE, CHAIN_APPROX_SIMPLE);