|
|
|
@ -1,11 +1,24 @@ |
|
|
|
|
#include "cv.h" |
|
|
|
|
#include "highgui.h" |
|
|
|
|
#include <iostream> |
|
|
|
|
|
|
|
|
|
using namespace cv; |
|
|
|
|
|
|
|
|
|
Mat img; |
|
|
|
|
int threshval = 100; |
|
|
|
|
|
|
|
|
|
void help() |
|
|
|
|
{ |
|
|
|
|
cout << |
|
|
|
|
"Program to demonstrate connected components and use of the trackbar\n" |
|
|
|
|
<< "\n" |
|
|
|
|
<< "Usage: ./connected_components <image>\n" |
|
|
|
|
<< "\n" |
|
|
|
|
<< "The image is converted to grayscale and displayed, another image has a trackbar\n" |
|
|
|
|
<< "that controls thresholding and thereby the extracted contours which are drawn in color\n" |
|
|
|
|
<< endl; |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
void on_trackbar(int, void*) |
|
|
|
|
{ |
|
|
|
|
Mat bw = threshval < 128 ? (img < threshval) : (img > threshval); |
|
|
|
@ -34,9 +47,13 @@ void on_trackbar(int, void*) |
|
|
|
|
|
|
|
|
|
int main( int argc, char** argv ) |
|
|
|
|
{ |
|
|
|
|
// the first command line parameter must be file name of binary
|
|
|
|
|
// (black-n-white) image
|
|
|
|
|
if( !(img=imread(argc == 2 ? argv[1] : "stuff.jpg", 0)).data) |
|
|
|
|
// the first command line parameter
|
|
|
|
|
if(argc != 2) |
|
|
|
|
{ |
|
|
|
|
help(); |
|
|
|
|
return -1; |
|
|
|
|
} |
|
|
|
|
if( !(img=imread(argc == 2 ? argv[1] : "stuff.jpg", 0)).data) //The ending 0 in imread converts the image to grayscale.
|
|
|
|
|
return -1; |
|
|
|
|
|
|
|
|
|
namedWindow( "Image", 1 ); |
|
|
|
|