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You just wait for 10 miliseconds for a key input on every image.

if(waitKey(10) != 'y')
{
      face = detectAndDisplay(cv_ptr->image);
}

I don't think that's enough time four you to press the key in the right moment ;)

Wait for something like 2-3 seconds to have enough time to press the right key, if that's not an option you need to think about a design change (maybe put the image display in an extra thread).

Hope that helps.

You just wait for 10 miliseconds for a key input on every image.

if(waitKey(10) != 'y')
{
      face = detectAndDisplay(cv_ptr->image);
}

I don't think that's enough time four for you to press the key in the right moment ;)

Wait for something like 2-3 seconds some more to have enough time be able to press the right key, if that's not an option you need may want to think about a design change (maybe put the image display in an extra thread).

Hope that helps.