Color-fringe pattern profilometry using an efficient iterative algorithm

Color profilometry techniques: A review

“…Phase-shifting techniques have been frequently used in 3D imaging, because of their accuracy and speed, although, as it was mentioned before, some limitations are observed. In recent years the merging of color information has been increasingly used in an attempt to develop either a single-shot or multi-shot phaseshifting, able to encode supplementary surface data on an image or images to reduce the ambiguity presented in traditional grey-level phase-shifting on discontinuous surfaces [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29].…”

“…According to the topography of the tested area, the pattern will be distorted allowing to retrieve the phase of the object, and by extracting the color planes from the acquired image, three phase-shifted sinusoidal patterns are achieved. Then the traditional phase-shifting methods to retrieve the wrapped and unwrapped phases can be applied [15][16][17][18][19][20][21][22][23][24]. Fig.…”

“…Flores et al [18] also present a similar procedure, based on the encoding of three phase-shifted fringes onto the RGB channels of a single color pattern. An algorithm to reduce crosstalk is proposed, along with an iterative algorithm to retrieve the phase with higher precision.…”

Colored digital Moire technique for self-occluding shading in fringe projection profilometry

“…Since the FPP signal's nature has three variables -or more for distorting harmonics-the phase recovery from a single fringe pattern is an ill-posed problem in the Hadamard sense 5 . In order to overcome this issue, real-time applications need to introduce prior information like spatial phase carriers and/or color encoding as well as using two video projectors 3,[6][7][8][9][10][11][12][13][14] and references therein.…”

Optical Technology and Measurement for Industrial Applications Conference

“…*cyliu66@ym.edu.tw; phone 886-2-28267020 Single-shot fringe projection measurements are insensitive to signal noises because only one image needs to be captured. The single-shot fringe projection methods can be generally classified into discrete and continuous coding processes [14][15][16][17][18][19][20]. The discrete coding patterns present a digital shape with the same intensity value and the shape dimension determines from the intensity of the measured object surface.…”