Line-based calibration of a micro -vision motion measurement system

We propose a flexible and practical line-based method for calibrating a micro-vision motion measurement system by using a resolution target, considering the lens distortion. First, centerlines of the stripes in the image of resolution target are extracted with an improved center gravity approach. Then distortion coefficients are obtained through the nonlinear optimization, utilizing straightness of the lines. Finally, these lines are corrected and used for estimating parameters of the system. Two experiments are conducted to validate the effectiveness of the proposed method. The results demonstrate that our method is effective and practical for calibrating the micro-vision measurement system.