Three-dimensional measurement method based on reusing equally spaced binary stripes

To eliminate the effect of nonlinear errors on measurement results, this paper presents a new method, to our knowledge, to overcome the nonlinear response of commercial projectors and cameras by using binary stripes for coding. The method shifts the generated equally spaced binary stripes by a fixed number of pixel points to obtain different stripe maps, followed by sequential projection of these binary stripes with a digital projector. The acquired binary stripes are reused in the 3D reconstruction combined with the phase-shift method and can be reduced to sinusoidal stripes with different phase shifts by a specific superposition method. In this paper, this method is combined with the traditional four-step phase-shift method for experiments. The results show that the accuracy of the wrapped phase obtained by the method proposed in this paper is 13.88% higher than that obtained by the traditional 16-step phase-shift method. Similarly, the accuracy of the standard ball measurement is increased by 21.05%. Additionally, the point cloud on the surface of the complex object obtained by the proposed method is smoother and more delicate than that obtained by the traditional 16-step phase-shift method.