Camera Calibration
How to calibrate the camera.
The standard camera model used in OpenCV and ROS is referred to as the Pinhole model. You can read more about it here:
Camera Calibration and 3D Reconstruction — OpenCV 2.4.13.7 documentation
The camera can be calibrated by one of the three following ways:

1.Kalibr

Kalibr is toolbox for multiple camera and sensor calibration.
GitHub - ethz-asl/kalibr: The Kalibr visual-inertial calibration toolbox
GitHub

2. OpenCV

Use the functions mentioned in the above link after installing and importing the OpenCV package.

3. ROS

Use the camera_calibration ROS package:
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4. MATLAB

Use the MATLAB app for camera calibration:
Using the Single Camera Calibrator App - MATLAB & Simulink - MathWorks India
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On this page
1.Kalibr
2. OpenCV
3. ROS
4. MATLAB