Accurate calibration method for a structured light system

High-resolution, High-speed 3-D Dynamically Deformable Shape Measurement Using Digital Fringe Projection Techniques

“…Following the work by Zhang & Huang (2006b), a number of calibration approaches have been developed (Gao et al, 2008;Huang & Han, 2006;Li et al, 2008;Yang et al, 2008). All these techniques are essentially the same: to establish the one-to-one mapping between the projector and the camera.…”

Optimal checkerboard selection for structured light system calibration

“…However, because the calibration only needs to be performed once, the speed is not a big factor to be considered in this study. To alleviate the problems induced the centerline detection used in Zhang and Huang's method, and the three wavelength method adopted by Li et al, 13 we use a digital multiple-wavelength phase-shifting algorithm. 16 For a three-step phase-shifting algorithm, only three images are required to compute the phase.…”

“…Because the projector and camera calibration are independent (to some extent), the calibration accuracy is significantly improved, and the calibration speed is drastically increased. Following this work, a number of calibration techniques have been proposed, [12][13][14][15] but they are essentially the same in that all of these techniques are to establish the correspondences between the projector and the camera point by point. Once the system is calibrated, the xyz coordinates can be computed from the "absolute" phase.…”

“…To further alleviate the problem induced the centerline detection used in Zhang and Huang's method and the method adopted by Li et al, 13 we use a digital multiple-wavelength phase-shifting method for our study. 16 The advantage of this digital multiple-wavelength algorithm is that the noise level is comparable to that of a single-wavelength phase-shifting technique while the absolute phase is obtained pointwise with sub pixel accuracy.…”

“…To alleviate this problem, Li et al used an optimal wavelength selection approach. 13 For this approach, because only three wavelengths are used, the fringe noises play a significant role for accurate projector image generation because the longest-wavelength fringe images must be used.…”