A Decoupling Method Based on Phase-Shift Calculation by Encoding Color Fringe Pattern

Although the RGB channel requires fewer images for performing 3D measurement than the sinusoidal fringe phase-shift method, the coupling between the channels affect the measurement accuracy. Along these lines, a novel decoupling method was proposed, which was based on phase-shift calculation by encoding sinusoidal color fringe patterns. In our approach, every six sinusoidal fringes in the sinusoidal fringe phase-shift method are encoded into four sinusoidal color fringe patterns. These sinusoidal color fringes can replace six sinusoidal fringes without the effect of crosstalk. Compared with the traditional sinusoidal color fringe phase-shift method, a higher measurement accuracy was demonstrated. Moreover, there was no need for preprocessing and post-processing, and the calculation speed was faster.