title: What is the difference between solvePnP and calibrateCamera in opencv?
body: <p><code>calibrateCamera()</code> provides <code>rvec</code>, <code>tvec</code>, <code>distCoeff</code> and <code>cameraMatrix</code> whereas <code>solvePnP()</code> takes <code>cameraMatrix</code>, <code>distCoeff</code> as input and provides <code>rvec</code>, <code>tvec</code> as output. What is the difference between these two functions?</p>