A novel and calibration-simple structured light 3D reconstruction system based on parallel-axis-display system

Abstract

Triangular stereo model and phase-height model are two commonly used methods in the field of 3D reconstruction. The former requires complex and time-consuming system calibration, and the projector’s nonlinear errors can significantly affect measurement accuracy. The latter requires strict geometric constraints or the use of a high-precision displacement platform to establish the relationship between phase and height for 3D reconstruction. This paper proposes a 3D reconstruction model based on a parallel-axis-display screen system, composed of a projector, camera, and display screen. The model uses the display screen as a reference plane and only requires that the optical axes of the projector and camera be parallel to each other and perpendicular to the display screen. This geometric condition is easy to achieve, and there is no need to establish the relationship between phase and height. Additionally, the model effectively addresses the projector’s nonlinear response errors. For any point in space, its coordinates can be calculated based on the geometric relationships in the system, without the need for complex system parameters. Experimental measurements of standard gauge blocks and sphere confirm the validity of the proposed parallel-axis-display screen system.