average mean fisherface/components

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Right now i'm just showing a snapshot of the user if it recognised it in its own rectangle, but that snapshot is of the current camera. I want a picture of the user that is identified through one of the training images stored in the images vector. So, if i can't do that easily, can i:

display the fisher faces /components in my program. Is there a simple way of doing this?

I have this: Mat averageFace=model->get<mat>("mean");

and tried to use the getImageFrom1DFloat but it couldn't find that function call. I know the samples form byte fish and shervin but they are all interlinked with their code more or less. Is there some simple example code i could use?

Thanks