Searching discontinuous and jump points in physical discontinuities with adaptive phase unwrapping

This study proposes a method of detecting discontinuous points in physical discontinuities in light intensity fringe pattern (IFP). After changing the experimental conditions, several images were captured with CCD and converted into wrapped phase maps with phase shifting technology (PST). In low-noise wrapped phase maps, discontinuous and jump points were searched directly; and in high-noise wrapped phase maps, these points were searched after filtering. Noise discontinuous points were screened by image comparison to correctly select physical discontinuous points. The location of physical discontinuities was marked according to the assembly principle to prevent diffusion on both sides along the discontinuous line by phase unwrapping from crossing the line. In doing so, the surface appearance of the specimen was phase unwrapped successfully. © 2012 CAD Solutions, LLC.