Phase retrieval in digital speckle pattern interferometry by application of two-dimensional active contours called...

Area of Science:

• Optical Metrology
• Interferometry
• Image Processing

Background:

• Digital speckle pattern interferometry (DSPI) is a powerful technique for non-contact measurement.
• Phase retrieval from fringe patterns is crucial for quantitative analysis in DSPI.
• Existing methods for phase retrieval from single fringe patterns have limitations.

Purpose of the Study:

• To develop a novel and robust phase retrieval method for digital speckle pattern interferometry.
• To accurately reconstruct phase maps from single closed-fringe patterns.
• To overcome limitations of existing phase retrieval techniques.

Main Methods:

• A novel phase retrieval approach based on estimating the local sign of the quadrature component.
• Fringe denoising using a weighted smoothing spline method.
• Sign estimation via local fringe orientation analysis and segmentation using 2D active contours (snakes).

Main Results:

• The proposed method successfully retrieves phase maps from single closed-fringe patterns.
• The technique demonstrates robustness in handling absent fringe jumps.
• Performance evaluation shows comparable or superior results to spiral-phase and Fourier-transform methods.

Conclusions:

• The developed phase retrieval technique offers an effective solution for analyzing single fringe patterns in DSPI.
• The method provides accurate phase map reconstruction, even in challenging scenarios.
• This approach enhances the capabilities of digital speckle pattern interferometry for quantitative measurements.