ABSTRACT

This chapter addresses the active and passive projector nonlineargamma compensation methods for phase error reduction. The active method modies fringe patterns before their projection to ensure sinusoidality; and the passive method, in contrast, compensates for the phase error after capturing those distorted sinusoidal fringe patterns. Our study nds that the active method tends to provide more consistent high-quality fringe patterns regardless the amount of projector’s defocusing; yet the eectiveness of a passive method is diminished if measurement condition deviates from calibration condition.