This study involvesrecording of transmission holograms of various objects which are processed to obtain phase holograms. Good quality holograms are obtained by optimizing the necessary parameters as presented in[29]. After replaying the hologram, distinctive fringes are observed in the reconstructed object wave at the back plane of the holographic plate. The fringes are recorded using a CCD camera interfaced with a computer. Three dimensional wavefront maps of the fringes reveal different surface profiles for all objects used in the study. Various errorsare measured for each recorded fringe pattern and found to varyaccording to the object used during hologram recording. This unique information is used as the input to generate sets of linear and 2–Dimensionalcodes that can be used for product authentication. Special scanners are proposed to read both the hologram and thebarcode for product verification.
展开▼
