Optics Express · 2006 · 251 citations · 0 references
Geometric ModelingOptimum 3-Frequency SelectionColor ChannelsLight Field ImagingEngineeringAbsolute 3DOptical PropertiesOptic DesignColorimetryGeometrical OpticInterferometryOptical System DesignRgb ChannelsComputational ImagingFreeform OpticPhotometric StereoOptical SystemsDigital Holography
The paper introduces a novel color fringe projection system that simultaneously captures absolute 3D shape and color, addressing crosstalk between color channels. The system employs optimum 3‑frequency interferometry, encoding three fringe sets of varying pitch into the RGB channels of a digital light projector and capturing them with a 3‑chip color CCD, then uses phase‑shifting analysis to compute sub‑wavelength phase and absolute phase per pixel while simultaneously recording color data. The method yields full‑field absolute 3D shape and color, with preliminary results demonstrating effective mitigation of color‑channel crosstalk.
We present a novel color fringe projection system to obtain absolute 3D shape and color of objects simultaneously. Optimum 3-frequency interferometry is used to produce time efficient analysis of the projected fringes by encoding three fringe sets of different pitch into the primary colors of a digital light projector and recording the information on a 3-chip color CCD camera. Phase shifting analysis is used to retrieve subwavelength phase information. Absolute phase across the field is calculated using the 3-frequency method independently at each pixel. Concurrent color data is also captured via the RGB channels of the CCD. Thus full-field absolute shape (XYZ) and color (RGB) can be obtained. In this paper we present the basis of the technique and preliminary results having addressed the issue of crosstalk between the color channels.