Physics

Observational error

Projector

Mathematics

System of measurement

Psychotherapist

Algorithm

Optics

Statistics

Astronomy

Shadow (psychology)

Residual

Calibration

Structured-light 3D scanner

Artificial intelligence

Psychology

Structured light

Scanner

Computer science

Quantum mechanics

Computer vision

Projection (relational algebra)

Digital Light Processing

Applied Optics

This paper introduces a structured light system with two projectors and one camera for three-dimensional (3D) shape measurement to alleviate problems created by a single projector such as the shadow problem. In particular, we developed (1) a system calibration framework that can accurately calibrate each such camera-projector system; (2) a residual error correction method based on the system error function; and (3) a data fusion method utilizing the angle between the projection direction and surface normal. Experimental results demonstrate that the proposed dual-projector structured light system improves the measurement accuracy besides extending the measurement range of a single projector system.

Three-dimensional shape measurement using a structured light system with dual projectors