Three-dimensional shape profiling by sinusoidal phase-shifting methods is affected by the non-linearity of the projector. To overcome this problem, the defocused projection of binary patterns has become an important alternative to generate sinusoidal fringe patterns. In this paper, we present an efficient technique to generate binary fringe patterns where we use the symmetry and periodicity properties of binary-coded sinusoidal intensity. This reduces the search-space for the optimization problem. The patterns are projected out-of-focus to generate quasi-sinusoidal patterns, which can be used together with a phase-shifting algorithm to retrieve 3-D shape measurements. Simulations and experimental results show the feasibility of the proposed scheme.

Date Published: 30 August 2017
PDF: 9 pages
Proc. SPIE 10403, Infrared Remote Sensing and Instrumentation XXV, 1040312 (30 August 2017); doi: 10.1117/12.2275355

Published in SPIE Proceedings Vol. 10403:
Infrared Remote Sensing and Instrumentation XXV
Marija Strojnik; Maureen S. Kirk, Editor(s)