Abstract: This article introduces a group of experiments of grouping contrast calibration that intends
to show how camera and calibration board, the two key equipments of camera calibration, impact the
accuracy of camera calibration. In these experiments, first, we made three plane calibration boards,
which were sized A2, A3, A4, respectively. Second, we chose four different types of digital camera
and collected 240 pieces of checkerboard calibration plate images by using it. Last, according to the
principal (or theory) of camera pinhole model, we conducted the camera calibration experiments by
using the MATLAB camera calibration tool. The results of these experiments show that the camera
calibration accuracy is very different while using different sizes of calibration board. From the results,
we can see that the A3 calibration board is the best method for calibrating CCD camera which has the
smallest resolution since the error of the average values were less than 0.1 pixel. The results of these
experiments have important value for choosing camera and calibration board in computer vision
research.

Key words: computer vision, camera calibration, camera pinhole model, MATLAB camera calibration
toolbox