opencv/samples/cpp/edge.cpp

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#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
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#include <stdio.h>
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using namespace cv;
using namespace std;
int edgeThresh = 1;
Mat image, gray, edge, cedge;
// define a trackbar callback
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static void onTrackbar(int, void*)
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{
blur(gray, edge, Size(3,3));
// Run the edge detector on grayscale
Canny(edge, edge, edgeThresh, edgeThresh*3, 3);
cedge = Scalar::all(0);
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image.copyTo(cedge, edge);
imshow("Edge map", cedge);
}
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static void help()
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{
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printf("\nThis sample demonstrates Canny edge detection\n"
"Call:\n"
" /.edge [image_name -- Default is fruits.jpg]\n\n");
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}
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const char* keys =
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{
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"{1| |fruits.jpg|input image name}"
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};
int main( int argc, const char** argv )
{
help();
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CommandLineParser parser(argc, argv, keys);
string filename = parser.get<string>("1");
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image = imread(filename, 1);
if(image.empty())
{
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printf("Cannot read image file: %s\n", filename.c_str());
help();
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return -1;
}
cedge.create(image.size(), image.type());
cvtColor(image, gray, CV_BGR2GRAY);
// Create a window
namedWindow("Edge map", 1);
// create a toolbar
createTrackbar("Canny threshold", "Edge map", &edgeThresh, 100, onTrackbar);
// Show the image
onTrackbar(0, 0);
// Wait for a key stroke; the same function arranges events processing
waitKey(0);
return 0;
}