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... and please check if ( cascade.empty() ) for all 3

... and please check if ( cascade.empty() ) for all 3look at your code, again, you only load the face & eye cascades, but never your nose one. there should be a line like:

    if (!nose_cascade.load(nose_cascade_name)) {
         printf("--(!)Error loading the nose cascade\n"); return -1; 
    };

look at your code, again, you only load the face & eye cascades, but never your nose one. there should be a line like:

    if (!nose_cascade.load(nose_cascade_name)) {
         printf("--(!)Error loading the nose cascade\n"); return -1; 
    };