Autoexposure for three-dimensional shape measurement using a digital-light-processing projector

Generic nonsinusoidal phase error correction for three-dimensional shape measurement using a digital video projector.

A structured light system using a digital video projector is widely used for 3D shape measurement. However, the nonlinear gamma of the projector causes the projected fringe patterns to be nonsinusoidal, which results in phase error and therefore measurement error. It has been shown that, by using a small look-up table (LUT), this type of phase error can be reduced significantly for a three-step...

Mechanical performance of three-dimensional bio- nanocomposite scaffolds designed with digital light processing for biomedical applications

Introduction: The need for biocompatible and bioactive scaffolds to accelerate the regeneration and repair of fractured bones has been considered for bone tissue engineering applications during recent decades. The new methods were developed to produce scaffolds to improve the tissue quality, size of cavities, control the porosity and increase the scaffold compressive strength u...

Uniaxial three-dimensional shape measurement with projector defocusing

Absolute three-dimensional shape measurement using coded fringe patterns without phase unwrapping or projector calibration.

This paper presents a novel stereo-phase-based absolute three-dimensional (3D) shape measurement that requires neither phase unwrapping nor projector calibration. This proposed method can be divided into two steps: (1) obtain a coarse disparity map from the quality map; and (2) refine the disparity map using wrapped phase. Fringe patterns are modified to encode the quality map for efficient and...

High-resolution, high-speed three-dimensional shape measurement using projector defocusing

Yuanzheng Gong Song Zhang Iowa State University Department of Mechanical Engineering Ames, Iowa 50011 E-mail: [email protected] Abstract. We present a high-resolution, high-speed three-dimensional (3-D) shape measurement technique that can reach the speed limit of a digital fringe projection system without significantly increasing the system cost. Instead of generating sinusoidal fringe patterns...