Camera Calibration - why do you have to move the calibration board?

1. Why do we need to do camera calibration?
2. Why checkerboard is used for camera calibration?
3. How many images needed for camera calibration?

Why do we need to do camera calibration?

The camera calibration aims to determine the geometric parameters of the image formation process [1]. This is a crucial step in many computer vision applications especially when metric information about the scene is required.

Why checkerboard is used for camera calibration?

Camera calibration is a key step in three-dimensional (3-D) reconstruction, and its accuracy directly affects the final effect and quality of the 3-D models. In computer vision, the checkerboard pattern is widely used for camera calibration because it is easily produced and enables high accuracy.

How many images needed for camera calibration?

Open the camera(you can use OpenCV codes or just a standard camera app.) and take at least 20 images. They should be in different angles and distances because the calibration code needs various points with different perspectives.