Analysis and Compensation for Lateral Chromatic Aberration in a Color Coding Structured Light 3D Measurement System

Area of Science:

• Optical Metrology
• 3D Imaging Systems
• Computer Vision

Background:

• Color-coding enhances structured light 3D measurement efficiency.
• Lateral chromatic aberration (LCA) significantly reduces measurement accuracy in these systems.

Purpose of the Study:

• To analyze LCA in structured light 3D measurement.
• To propose and verify a method for compensating LCA-induced errors.

Main Methods:

• Constructed a 3D error map of LCA using projective transformation and calibration with a flat board.
• Compared RGB circle coordinates with white circle coordinates to quantify LCA errors.
• Compensated projector image coordinates using the 3D error map and tri-linear interpolation.

Main Results:

• Developed a method to accurately map and compensate for LCA in 3D measurements.
• Experimental verification demonstrated the effectiveness of the proposed compensation technique.
• Achieved higher accuracy in 3D coordinate recalculation after compensation.

Conclusions:

• The proposed method effectively compensates for lateral chromatic aberration in structured light 3D measurement systems.
• This approach significantly improves measurement accuracy, addressing a key limitation.
• The technique offers a viable solution for enhancing precision in 3D optical metrology.