Augmented Lagrangian Digital Image Correlation (2D_ALDIC)
- Jin Yang1
AL-DIC(Augmented Lagrangian DIC) is a fast, parallel-computing hybrid DIC algorithm, which combines advantages of local subset DIC method (fast computation speed, and parallel computing) and finite-element-based global DIC method (guarantee global kinematic compatibility and decrease noise). Advantages of AL-DIC algorithm  It's a fast algorithm using distributed parallel computing.  Global kinematic compatibility is added as a global constraint in the form of augmented Lagrangian, and solved using Alternating Direction Method of Multipliers scheme.  Both displacement fields and affine deformation gradients are correlated at the same time.  No need of much manual experience about choosing displacement smoothing filters.  It works well with compressed DIC images and adaptive mesh. See our paper: Yang, J. & Bhattacharya, K. Exp Mech (2019). https://doi.org/10.1007/s11340-018-00459-y;  Both accumulative and incremental DIC modes are implemented to deal with image sequences, which is especially quite useful for very large deformations.
Prerequisites & Installation AL-DIC MATLAB code was tested on MATLAB versions later than R2018a. Both single thread and parallel computing features are included in AL-DIC code. Please download and unzip the code to the MATLAB working path. Then, execute the mail file main_ALDIC.m.
Related Publication: Augmented Lagrangian Digital Image Correlation Jin Yang Experimental Mechanics https://doi.org/10.1007/s11340-018-00457-0 eng