Argos

Heaviside-Enriched Displacement Fields

Standard DIC assumes continuous displacement inside each subset, which smears out discontinuities across several pixels. Argos adds a Heaviside step function to the correlation model, allowing a sharp jump to be identified within each subset.

The subset shape function is augmented with a jump vector and a Heaviside function:

Based on: F. Bourdin, J.C. Stinville, M.P. Echlin, P.G. Callahan, W.C. Lenthe, C.J. Torbet, D. Texier, F. Bridier, J. Cormier, P. Villechaise, T.M. Pollock, V. Valle, Measurements of plastic localization by heaviside-digital image correlation, Acta Materialia, Vol. 157, pp. 307–325, 2018. DOI

U_x displacement field computed on a dataset from A. Rouwane, D. Texier, J.-N. Périé, J.-E. Dufour, J.C. Stinville et al., "High resolution and large field of view imaging using a stitching procedure coupled with distortion corrections", Optics and Laser Technology, Vol. 177, 2024. Dataset courtesy of Damien Texier.

Fracture & Discontinuity Analysis

Dedicated post-processing for cracks, twins and slip bands.

The fracture tab exposes the full enrichment output: crack opening displacement (intensity and direction), crack angle α, opening direction β, and a crystallographic decomposition into screw (longitudinal) and edge (transverse) components relative to the crack front.

Dataset from A. Rouwane, D. Texier, J.-N. Périé, J.-E. Dufour, J.C. Stinville et al., Optics and Laser Technology, Vol. 177, 2024. Courtesy of Damien Texier.

Strain Post-Processing

Customizable derivative kernels and built-in criteria.

Compute the full strain tensor (ε_xx, ε_yy, ε_xy) from displacement fields using separable gradient operators.

• Separable gradient kernels — Sobel, Scharr, centered finite differences, or custom
• Custom expressions — built-in math parser for user-defined strain criteria

Dataset from A. Rouwane, D. Texier, J.-N. Périé, J.-E. Dufour, J.C. Stinville et al., Optics and Laser Technology, Vol. 177, 2024. Courtesy of Damien Texier.

Mosaic Stitching & Batch Mode

Large-area analysis from tiled acquisitions.

Assemble multi-tile acquisitions into a seamless mosaic before running DIC.

• Automated grid layout — row/column organization with configurable overlap, handles missing tiles
• Batch mode — process each tile pair independently without stitching, for high-throughput analysis

Dataset from A. Rouwane, D. Texier, J.-N. Périé, J.-E. Dufour, J.C. Stinville et al., Optics and Laser Technology, Vol. 177, 2024. Courtesy of Damien Texier.

Under the Hood

Core engine specifications.