onTrackbar        127 samples/cpp/distrans.cpp     createTrackbar("Brightness Threshold", "Distance Map", &edgeThresh, 255, onTrackbar, 0);
onTrackbar        132 samples/cpp/distrans.cpp         onTrackbar(0, 0);
onTrackbar         60 samples/cpp/edge.cpp     createTrackbar("Canny threshold", "Edge map", &edgeThresh, 100, onTrackbar);
onTrackbar         63 samples/cpp/edge.cpp     onTrackbar(0, 0);
onTrackbar        175 samples/cpp/pca.cpp     createTrackbar("Retained Variance (%)", winName, &pos, 100, onTrackbar, (void*)&p);