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12 Mat image, gray, edge, cedge;
17     blur(gray, edge, Size(3,3));
19     // Run the edge detector on grayscale
20     Canny(edge, edge, edgeThresh, edgeThresh*3, 3);
23     image.copyTo(cedge, edge);
24     imshow("Edge map", cedge);
29     printf("\nThis sample demonstrates Canny edge detection\n"
31            "    /.edge [image_name -- Default is ../data/fruits.jpg]\n\n");
57     namedWindow("Edge map", 1);
60     createTrackbar("Canny threshold", "Edge map", &edgeThresh, 100, onTrackbar);