What is R_rgb and R_event ?

[shrutarv]

I went through your paper and code and have a few questions:

1. In your paper you mention under the equation 4 "R_rgb and R_event is the rotation matrix between dis-
   torted and undistorted frame". How do you get these rotation matrices ?
2. In the code, Kr1 is for event camera and Kr0 for rgb camera. Right?