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does my application need ALSO to be rebuilt against the opencv_world320.lib which the "Qt" DLL was built?

YES. (you also probably need to change some code in your application, where it should be using Qt functionality)

you'd have to:

  • install Qt on your dev box
  • rebuild opencv from src with Qt enabled
  • rebuild your app, so it's actually using qt functionality
  • either have the client install te same Qt version you used, or deploy the Qt dll's along with your app