High speed 3-D Surface Profilometry Employing Trapezoidal HSI Phase Shifting Method with Multi-band Calibration for Colour Surface Reconstruction

TL;DR

This paper introduces a high-speed 3D surface profilometry technique using a novel HSI-based phase shifting method with multi-band calibration, enabling accurate color surface reconstruction from single images.

Contribution

It develops a new optical measurement approach with a color calibration method for hue, improving accuracy on non-monochromatic surfaces in high-speed 3D profilometry.

Findings

Measurement accuracy within 2.5% of the range.

Repeatability of 3.0% within +/- 3 sigma.

Effective single-shot 3D reconstruction demonstrated.

Abstract

This article presents a new optical measurement method employing a HSI (Hue, Saturation and Intensity) colour model to form trapezoidal structured patterns for morphology reconstruction of a measured object at a high speed. Profilometry on objects having non-monochromatic surfaces is considered as one of the remaining most challenges faced by the currently existing structured-light projection methods since the surface reflectivity to red, green and blue light may vary significantly. To address this, an innovative colour calibration method for hue component is developed to determine the accurate reflectivity response of the measured surface. The trapezoidal colour pattern is calibrated to compensate the hue-shifted quantity induced by the reflective characteristics of the object's surface. The developed method can reconstruct precise 3-D surface models from objects by acquiring a single-shot image, which can achieve high-speed profilometry and avoid in-situ potential measurement disturbances such as environmental vibration. To verify the feasibility of the developed methodology, some experiments were conducted to confirm that the measurement accuracy can be controlled within 2.5% of the overall measurement range and the repeatability of 3.0% within +/- 3*sigma can be achieved.