Single-shot color phase shifting profilometry method robust against color crosstalk

Area of Science:

• Optics and Photonics
• Computer Vision
• Metrology

Background:

• Color fringe projection profilometry is susceptible to errors from object color and sensor chromatic aberrations.
• Standard phase shifting methods struggle with complex surface colors and crosstalk effects.

Purpose of the Study:

• To present a method for retrieving phase from a single composite color fringe pattern on colorful objects.
• To experimentally validate error reduction in RGB channel responses and color crosstalk.
• To demonstrate a two-step algorithm for processing these patterns.

Main Methods:

• Projection of a single composite RGB fringe pattern with small inter-channel phase shifts.
• Development and application of a two-step processing algorithm.
• Comparison with a standard temporal four-step phase shifting method.

Main Results:

• The proposed method effectively reduces phase retrieval errors caused by object color.
• Experimental validation confirms the efficacy of the composite RGB fringe pattern approach.
• The two-step algorithm successfully processes the generated fringe patterns.

Conclusions:

• The novel method offers improved phase retrieval accuracy for colorful surfaces.
• This technique minimizes errors associated with sensor color response and crosstalk.
• The developed algorithm is suitable for processing single composite color fringe patterns.