title: Raspberry pi:calibrate camera and undistortion of image
body: <p>I want to remove fisheye effect from image, so I need camera matrix and distortion cofficient. That's why I created <code>cal.py</code> file.</p>
  
  <p>When I run that file it give me camera matrix and distortion efficient which I had put in <code>undist.py</code> file to undistort the image. now every time i got the same RMS,camera matrix,distortion coefficient.</p>
  
  <p>but when i put this parameters in undist.py file that is give me blank image.. how to solve this problem?PLz help me...Thanks in advance.i have capture 8 image and one of the sample image of chessboard pattern.</p>