title: How is the camera coordinate system in OpenCV oriented?
body: <p>I'm trying to get the 3D coordinate of a point from the triangulation of two view.
  I'm not really sure if my results are correct or not.</p>
  <p>For example I'm not really sure if the sign of the coordinates are correct because I'm not sure how the camera frame is oriented.</p>
  <p>The z axis positive verse is entering or exiting the image plane?
  And x and y? Do they follow the right hand rule?</p>
  <p>Thanks in advance for a clarification!</p>