This program demonstrates connected components and use of the trackbar
#include <iostream>
int threshval = 100;
static void on_trackbar(int, void*)
{
Mat bw = threshval < 128 ? (img < threshval) : (img > threshval);
std::vector<Vec3b> colors(nLabels);
colors[0] =
Vec3b(0, 0, 0);
for(int label = 1; label < nLabels; ++label){
}
for(int r = 0; r < dst.rows; ++r){
for(int c = 0; c < dst.cols; ++c){
int label = labelImage.
at<
int>(r, c);
pixel = colors[label];
}
}
imshow(
"Connected Components", dst );
}
int main( int argc, const char** argv )
{
CommandLineParser parser(argc, argv,
"{@image|stuff.jpg|image for converting to a grayscale}");
parser.
about(
"\nThis program demonstrates connected components and use of the trackbar\n");
cout << "\nThe 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";
if(img.empty())
{
cout << "Could not read input image file: " << inputImage << endl;
return EXIT_FAILURE;
}
createTrackbar(
"Threshold",
"Connected Components", &threshval, 255, on_trackbar );
on_trackbar(threshval, 0);
return EXIT_SUCCESS;
}