title: How to convert a CvMat from type CV_AA to CV_32F
body: <p>The CvMat type 16 corresponds to "CV_AA".  Is there an easy conversion between this and the type CV_32F?  </p>
  
  <p>Something in the same vein as <code>cvCvtColor(cimg,gimg,CV_BGR2GRAY);</code>?</p>