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

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