(A) study on computer generated hologram identification tag system using fast simulated annealing and reconstruction-error reduction methods

Abstract

In this thesis, computer generated hologram ID tag system using fast simulated annealing method is introduced. The fast simulated annealing method greatly reduces the reconstruction error rate and generation time. The reconstruction algorithm of kinoform CGH ID tag by using electrical method is newly proposed. And the experimental results from the proposed reconstruction method are shown and analyzed. One-dimensional and two-dimensional barcode systems are most widely used as identification tag. But, because of low data storage capacity and low data security, their applications are restricted. In this thesis, the basic concept of hologram ID that improves the weakness of the previous barcode systems is proposed, and the process of generation and reconstruction of the hologram ID pattern is described. The conventional simulated annealing methods (original simulated annealing and low-error simulated annealing methods) have been adopted and analyzed for the purpose of hologram pattern generation. But, in the case of original simulated annealing, the reconstruction error rate is saturated relatively high value of about 10%. Although low-error simulated annealing provides the reconstruction results with a lower error rates and faster generation time than one of original simulated annealing, it is still serious problem for the purpose of hologram ID tag that the generation time increases exponentially as data size of original data increases. So, a kinoform CGH generation method with fast simulated annealing is proposed and described in this thesis. By using the simulation results, fast simulated annealing method is compared with original simulated annealing and low-error simulated annealing methods. And it is verified that fast simulated annealing can greatly save the elapsed time to approach saturation region. In this thesis, we successfully apply multilevel kinoform computer-generated hologram (CGH) patterns, which are recorded on a fine texture pape...