Algorithm

Structured-light 3D scanner

Optical engineering

Computer graphics (images)

Image processing

Telecommunications

Computer science

Projection (relational algebra)

Structured light

Scanner

Image resolution

Software

Physics

Optics

Image (mathematics)

Artificial intelligence

Digital Light Processing

Programming language

Frame rate

Projector

Computer vision

Frame (networking)

Optical Engineering

We describe a high-resolution, real-time 3-D shape measurement system based on a digital fringe projection and phase-shifting technique. It utilizes a single-chip digital light processing projector to project computer-generated fringe patterns onto the object, and a high-speed CCD camera synchronized with the projector to acquire the fringe images at a frame rate of 120 frames/s. A color CCD camera is also used to capture images for texture mapping. Based on a three-step phase-shifting technique, each frame of the 3-D shape is reconstructed using three consecutive fringe images. Therefore the 3-D data acquisition speed of the system is 40 frames/s. With this system, together with the fast three-step phase-shifting algorithm and parallel processing software we developed, high-resolution, real-time 3-D shape measurement is realized at a frame rate of up to 40 frames/s and a resolution of 532×500 points per frame.

High-resolution, real-time three-dimensional shape measurement