Camera Linear Calibration Algorithm Based on Features of Calibration Plate

In this paper, it presented a completely linear approach for camera calibration. The process is as follows: first, to calibrate the principal point and aspect radio of camera solely, and use CCD shooting the high-precision calibration plate. Second, to apply the SIFT algorithm for extracting the features’ centre sub-pixel coordinates of calibration plate. Finally, to solve the other internal and external camera parameters which based on Radial-Array-Constraints and first-order radial distortion model, mainly including the focal length, the first order radial distortion coefficient, the spin matrix and translation vector tz. In the Experiment, in order to eliminate the unstable effects for calibration results which coming from tz, the original linear calibration algorithm has been improved, using a separate calibration translation vector tz, then experimental data show that the algorithm has high accuracy, effective and practical calibration method.