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cvProjectPoints2 :ImagePoints units

Hi i used cvProjectPoints2 function to do the projection of a 3D points into 2D points.Now i get the 2D imagePoints(for example:image1.x=-663.450623 and image1.y=101.231941), and i wonder,on which units it's expressed: px or mm? How can i check if the results are raisonnable or not. Thank you in advance.