Digital image processing for three dimensional reconstruction

Membrane wall models occur in studies of respiratory and cardiovascular mechanics. To obtain the properties of elastomer and soft tissue membranes, and to validate numerical simulations, we need surface deformation information. This study examines an imaging method for reconstructing static surfaces. Rigid calibration and test objects, together with a latex membrane have grid lines drawn on them. They are photographed with a CCD camera, directly and through a mirror. The reconstructed locations of the grid crossing points are accurate for the rigid objects, and fitting a quadratic function to the membrane data provides information about surface stretch and shape.