Three-dimensional imaging based on Gray-code light projection: characterization of the measuring algorithm and...

Area of Science:

• Optics and Photonics
• Metrology
• Computer Vision

Background:

• Existing profilometers using multifrequency gratings have limitations with surfaces exhibiting discontinuities.
• Three-dimensional (3-D) imaging systems are crucial for detailed surface analysis.

Purpose of the Study:

• To describe a 3-D imaging system integrating Gray-code projection with an existing profilometer.
• To enhance the measurement flexibility for objects with surface discontinuities.
• To analyze the resolution and systematic errors of the Gray-code method for 3-D profiling.

Main Methods:

• Implementation of a Gray-code projection technique for 3-D imaging.
• Integration of the Gray-code method with a multifrequency grating-based profilometer.
• Detailed study of resolution and systematic error analysis for optimal parameter setting and calibration.

Main Results:

• The Gray-code method effectively evaluates 3-D profiles of objects with significant surface discontinuities.
• A suitable calibration procedure was developed, achieving an accuracy of 0.2 mm (0.1% of the field of view).
• Experimental results demonstrate the system's capability for accurate 3-D profiling.

Conclusions:

• The Gray-code projection system significantly increases the flexibility of 3-D profilometry for complex object topographies.
• The developed calibration procedure ensures high accuracy in 3-D measurements.
• This integrated system offers a robust solution for advanced 3-D surface analysis.