uint32 num_x # Number of checkerboard corners in the X direction
uint32 num_y # Number of corners in the Y direction
float32 spacing_x # Spacing between corners in the X direction (meters)
float32 spacing_y # Spacing between corners in the Y direction (meters)
# Specify how many times we want to upsample the image.
# This is often useful for detecting small checkerboards far away
# Configure openCV's subpixel corner detector