Rectify Oblique Multi-view Image with a Planar Calibration Target for In-plane Displacement and Strain Fields

In this paper, we demonstrate a 3D projective transformation to rectify oblique multi-view image with a planar calibration target for in-plane displacement and strain field measurement. The multi-camera semi-circular DIC system captures oblique multi-view image from three different view angles. Produce front view image from oblique projective image. The front view image can be analyzed by the DIC method to extract the in-plane displacement and strain field. The displacement can also be computed from contour maps obtained before and after the in-plane translation motion of rigid body. The experimental results show the measurement method is implemented to rectify oblique multi-view image for in-plane displacement and strain field.