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Editorial Team
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Asked: 2026-06-01T19:40:40+00:00

I am developing a C++ application for face authentication. First, I have to detect

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I am developing a C++ application for face authentication. First, I have to detect the face and pre-process the image.

  1. For face detection I have used the HaarCascadeClassifier. The problem is that the this tool or this algorithm gives me a facial region detected by a little bit large rectangle that englobes hair and some of the background. Is there a solution to change the dimension of this rectangle? I used “frontalfacecascaadclassifier.xml”.
  2. For face pre-processing i want to do face alignment exactly like this technique. How would I go about accomplishing this?
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1 Answer

  1. Editorial Team

    Can’t you then use another Haar classifier to find each eye (eyes are very easy to find) then assuming the person has two eyes and we define a ‘level’ face to mean the eyes are horizontal.

    Simply measure the anlge between the two eyes and rotate the image by that angle.

    angle = atan ( eye1.Y - eye2.Y ) / (eye1.X - eye2.X )
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