Fringe-carrier method is used in automatic fringe-order numbering of dynamic in-plane moire patterns. In experiment both static carrier and dynamic moire patterns are recorded. The image files corresponding to instants are set up to assign fringe orders automatically. Subtracting the carrier image from the modulated ones, the moire patterns due to the dynamic deformations are restored with fringe-order variation displayed by different grey levels.
"Automatic Fringe Detection Of Dynamic Moire Patterns", Proc. SPIE 1135, Image Processing III, (11 October 1989); doi: 10.1117/12.961659; https://doi.org/10.1117/12.961659