Accuracy enhancement of three-dimensional reconstruction using phase-shifting shadow moiré

Abstract

An iterative algorithm and a denoising method for accuracy enhancement of three-dimensional (3-D) reconstruction processes by shadow moire is proposed. Using traditional shadow moire for 3-D reconstruction leads to a nonuniform phase shift error. The proposed iterative algorithm eliminates this error by using three phase-shifted interferograms and obtains precise phase information. Moreover the proposed denoising method, which is based on undecimated wavelet transform, effectively eliminates noise and grating patterns while retaining useful information. The proposed phase shifting shadow moire method is compared with the structured lighting method, which is a common method for 3-D reconstruction, and it is further compared with traditional shadow moire. The methods are simulated in a 3ds-Max environment. The simulation results show that the proposed shadow moire technique achieves greater accuracy in comparison with the traditional shadow moire and structured lighting techniques and also it has higher accuracy than existing typical phase-shifting algorithms.