Questions about the principle of the package check_depth_error

[zhanghua7099]

Hi! Thanks for open-sourcing this good project. Could you please tell me some details about the check_depth_error?

https://github.com/jsk-ros-pkg/jsk_recognition/tree/master/jsk_pcl_ros/scripts/check_depth_error

The document demonstrated the use of this package.
https://jsk-docs.readthedocs.io/projects/jsk_recognition/en/latest/jsk_pcl_ros/calibration.html

However, the principle and reference of this package are not given. I want to learn more details about these points.

Could you please share with me some detailed documents about this package? Thank you very much!