  The increasing necessity for fisheye cameras in fields such as robotics and
autonomous driving has led to the proposal of various fisheye camera models.
While the evolution of camera models has facilitated the development of diverse
systems in the field, the lack of adaptation between different fisheye camera
models means that recalibration is always necessary, which is cumbersome. This
paper introduces a conversion tool for various previously proposed fisheye
camera models. It is user-friendly, simple, yet extremely fast and accurate,
offering conversion capabilities for a broader range of models compared to
existing tools. We have verified that models converted using our system perform
correctly in applications such as SLAM. By utilizing our system, researchers
can obtain output parameters directly from input parameters without the need
for an image set and any recalibration processes, thus serving as a bridge
across different fisheye camera models in various research fields. We provide
our system as an open source tool available at:
https://github.com/eowjd0512/fisheye-calib-adapter
