是否可以从投影矩阵获取主点？

Question

是否可以从4x4投影矩阵获得主点（cx，cy）？这是在此问题中询问的相同矩阵：Getting focal length and focal point from a projection matrix

  (SCNMatrix4) 
   s = (m11 = 1.83226573, 
   m12 = 0, 
   m13 = 0, 
   m14 = 0,
   m21 = 0,
   m22 = 2.44078445,
   m23 = 0,
   m24 = 0,
   m31 = -0.00576340035, 
   m32 = -0.0016724075, 
   m33 = -1.00019991, 
   m34 = -1, 
   m41 = 0, 
   m42 = 0, 
   m43 = -0.20002, 
   m44 = 0)

我要在此3x3相机矩阵中计算的值是x0和y0。