Global Calibration of Two Cameras with Optical Filter with non-Overlapping Views Using 1D Square Serrated Target

摘要

Many multi-vision measurement systems like outdoor industrial engineering utilize optical filter to filter unexpected light which makes it impossible to use traditional planar pattern for calibration. In this paper, we propose a stereo vision global calibration method for non-overlapping views that comprises two cameras, an optical line laser whose wave band within the optical filter's and 1D square serrated target. Vertex-points coordinates in the camera coordinate frame (CCF) are obtained based on the cross ratio invariance theory and vanishing points. Initial rotation vector and translation vector are confirmed by flexibly moving the target to at least three different positions. After a nonlinear refinement, external parameters are precisely determined. Experimental results show that the measurement accuracy reaches to 0.06 mm within the cameras' FOV of 450mm*370mm.