What are the parameters of a calibrated spherical camera?

1. What are the parameters of camera calibration?
2. How is a camera calibrated?
3. What is external and internal parameters of camera?
4. What is scale factor in camera calibration?

What are the parameters of camera calibration?

Camera parameters include intrinsics, extrinsics, and distortion coefficients. To estimate the camera parameters, you need to have 3-D world points and their corresponding 2-D image points. You can get these correspondences using multiple images of a calibration pattern, such as a checkerboard.

How is a camera calibrated?

The process of computing the camera parameters is called camera calibration. Generally, the camera calibration process uses images of a 3D object with a geometrical pattern (e.g. checker board). The pattern is called the calibration grid. The 3D co-ordinates of the pattern are matched to 2D image points.

What is external and internal parameters of camera?

The internal (or intrinsic) parameters determine how the image coordinates of a point are derived, given the spatial position of the point with respect to the camera [7]. The external (or extrinsic) parameters describe the geome-trical relation between the camera and the scene, or between different cameras.

What is scale factor in camera calibration?

Abstract. For objects on a plane, a "scale factor" relates the physical dimensions of the objects to the corresponding dimensions in a camera image. This scale factor may be the only calibration parameter of importance in many test applications.