title: How do I change the default checkerboard blocksize in OpenCV
body: <p>I'm currently experimenting with OpenCV's calibration toolbox and I'm using a default checkerboard pattern to calibrate a camera. I want to use larger checkerboard blocks so that I can stand farther away from the camera without affecting OpenCV's ability to detect the corners.</p>
  
  <p>As I understand it, OpenCV is pre-programmed with default block-size values. My question is: is there a way to change this default block-size value in the code? And where would I change this? TIA</p>