Calibration with blender

Create synth images with calibration pattern by blender:

Open calibration.blend in blender
Copy render.py content to blender text editor
Run script in blender
Distort images by image_distort.cpp

Pattern generation command

gen_pattern.py -c 14 -r 19 -T checkerboard -u px -s 220 -w 3508 -h 4961 && convert out.svg checkerboard.png