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{
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     waitKey(0);
     return 0;
}




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{
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   if( c >= 0 ) { return -1; }
   return 0;
  }

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  {
    imshow( window_name, dst );
    int c = waitKey ( delay );
    if( c >= 0 ) { return -1; }
    return 0;
  }


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