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In 2018, I was responsible for the production line camera setup of stereo camera calibration, and to ensure the performance of stereo camera calibration, an opencv-based inspection tool was created and various verifications were performed. The purpose was to compare the performance of the two camera calibration algorithms by inputting images and coordinate points as input. (OpenCV vs. other companies) In 2021, Distortion Rational, Thin Prime Model interface were additionally updated, The 2022 Fisheye model interface was also updated. In general, normal calibration is sufficient to cover, but If you want a normal wide angle or more precision, you can use the Rational model, For ultra-wide-angle cameras, we recommend using the Fisheye model. Since the method of calculating the distortion index is different for each model, it must be used separately.