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How to determine the similarity of face images?

Hi everyone,

I have 3 face images of a person with different facial expressions namely sad, happy and shocked. They all have different backgrounds and lighting environments.

Now I captured a photo of the same person by using the webcam.


  1. How can I determine which facial expression is that photo corresponds to?
  2. What transformations or filters should be applied to the images before the matching is done?

Thanks a lot!