High temporal and spatial resolution in time resolved speckle interferometry

► Use of the least squares approach for 2-step and 4-step processing algorithms. ► Use of orthogonal-triangular decomposition instead of pseudo-inverse matrix. ► Re-referencing with data acquired during deformation results in lower quality. ► 4-step phase stepped data processed with 1-, 2- and 4-step algorithms. ► Use of pixel-wise temporal histories if full-field speckle interferometry analysis fails.