Crop an image with Emgu

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Emgu-CV

Dear experts,

I´m trying to make a form application for face dtection with emgu. My purpose is to take a picture of a person with the web camera, detect the face coordinates and crop the image in such a way that the detected faces be always in the same proportion and position with respect of the picture edges. Basically is a document picture where I can always have the face image in the same place so I can mount the face over another image.

I made it with python and opencv (with getsubrect)but don't know how to do it with emgu.

if detectedFace:
  arg1 = detectedFace[0][0][0]
  arg2 = detectedFace[0][0][1]
  arg3 = detectedFace[0][0][2]
  arg4 = detectedFace[0][0][3]
  Izq = arg1 - arg3/10
  Sup = arg2 - arg4/4
  Der = arg3 + (arg3/5)
  Inf = arg4 +(arg4/2)
  destino = ('C:\\temp\\camera-test-cut.jpg')
imagen = cv.GetSubRect(imcolor,(Izq, Sup, Der, Inf))
cv.SaveImage(destino, imagen)

With the help of emgu tutotial I have been able to capture the camera and detect the face but can't crop the image. Any sugestion?

Thanks.