intrinsic calibration of the kinect cameras

edit

I do the tutorial in http://www.ros.org/wiki/openni_launch/Tutorials/IntrinsicCalibration?action=show&redirect=openni_camera%2Fcalibration

3.RGB camera

roslaunch openni_launch openni.launch

rosrun camera_calibration cameracalibrator.py image:=/camera/rgb/image_raw camera:=/camera/rgb --size 5x4 --square 0.0245

I commit my successful calibration

and

4.IR(depth)camera

rosrun camera_calibration cameracalibrator.py image:=/camera/ir/image_raw camera:=/camera/ir --size 5x4 --square 0.0245

I also commit my successful calibration

Question.

1. How can I know the calibration result?

2. How can I compare the before calibration?

(Should I see a noticeable difference when viewing the raw and rectified images?)