Photometric DIC: a unified framework for global Stereo Digital Image Correlation based on the construction of textured digital twins

An innovative approach allowing to rigorously address surface curvature and lighting effects in Digital Image Correlation (DIC) is proposed. We draw inspiration from the research work Computer Vision (CV) regarding physical modelling of a camera adopt it bring novel significant capabilities for full-field measurements experimental solid mechanics. It gives rise unified framework global stereo DIC that we call Photometric (PhDIC). based on irradiance equation relies considerations explicit assumptions, which stands clear breakthrough compared usual grey level conservation assumption. Most importantly, allows define Twin Region Interest, makes possible compare model with different observations (real images taken viewpoints). This results consistent formalism throughout framework, suitable large-deformation large-strain displacement measurements. The potential PhDIC illustrated real case. Multi-view are first used measure (or scan) shape albedo (sometimes called intrinsic texture) an open-hole plate. kinematic basis considered measurement associated Finite-Element mesh. Results two completely sets pictures. Eventually, large structure measured using well-chosen single image.