title: The difference of the principal point x coordinates in right and left images after rectification is large
body: <p>The difference of the principal point x coordinates in right and left images after rectification in stereo imaging is about 10. The length of baseline is 10mm. The resolution of the left and right images is 800x600. </p>
  
  <p>Isn't the difference large for the setup? What reasons may cause this difference?</p>
  
  <p>In the book Learning OpenCV, it only reads that the difference will be 0 if the principal rays intersect at infinity, but doesn't mention the reasons.</p>
  
  <p><strong>Edit:</strong>
  Cx should be equal to Cx'.
  <a href="https://i.stack.imgur.com/9AE1E.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9AE1E.png" alt="enter image description here"></a></p>