“Pixelwise calibration method for telecentric structured light system,” (2024)

Y. Yang and S. Zhang, “Pixelwise calibration method for telecentric structured light system,” Applied Optics, 63(10), (2024)

Abstract

This paper introduces a pixel-wise calibration method designed for a structured light system utilizing a camera attached with a telecentric lens. In the calibration process, a white flat surface and another flat surface with circle dots serve as the calibration targets. After deriving the properties of the pinhole projector through conventional camera calibration method using circle dots and determining the camera's attributes via 3D feature points estimation through iterative optimizations, the white surface calibration target was positioned at various poses and reconstructed with initial camera and projector calibration data. Each 3D reconstructions was fitted with an ideal virtual ideal plane that was further used to create the pixel-wise phase-to-coordinate mapping. To optimize the calibration accuracy, various angled poses of the calibration target are employed to refine the initial results. Experimental findings validate that the proposed approach offers high calibration accuracy for a structured light system using a telecentric lens.