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Some suggestions for OpenCV since you are a new user

  • Skip the old C - api and move on to the new C++ - api which is much easier to use
  • When encountering a problem, google is your best friend, this is somewhat the most tackled problem using OpenCV
  • In your OpenCV folder there is a cpp folder under samples with tons of examples, including examples on facedetection
  • Follow this guide and this guide for a sample program that runs perfectly