Flexible line-scan camera calibration method using a coded eight trigrams pattern

This paper presents a novel, simple, yet flexible line-scan camera calibration method using a coded eight trigrams pattern. A new target pattern with orientation coded information is firstly proposed, which has a circular symmetry structure to expand the validity of the calibration range and obtain more effective coded information from various directions. Moreover, the proposed pattern is more easily positioned and detected in image when a rectangular stripes pattern is used as a calculation base. Besides, the proposed method does not require other auxiliary equipment during the calibration process due to the calibration target is convenient to carry. The applicability and accuracy of the proposed calibration method are verified by the simulation and real experiments.