title: Identification data reproduction in multilayered optical waveguide-type holographic memory cards.
abstract: The identification (ID) data reproduction was computationally examined for the compatibility with the aperture multiplexing and the telecentric system. The mask for the multiplexing caused shade in the reproduced ID data cell. The shading tolerance was improved by modulating the phase of the original image so that the ID data holograms diffract the light in the oblique direction or with the concentrating. The telecentric system reproduced all ID data cells in the same position of the image sensor and made a distinction among the cells impossible. This was solved by reproducing the cell point symmetrically from the corresponding ID data hologram in each 3x3 ID data block.
authors.affiliation: Department of Electrical and Computer Engineering, Oyama National College of Technology, 771 Nakakuki, Oyama, Tochigi 323-0806, Japan. senda@oyama-ct.ac.jp
authors.forename: Masakatsu
authors.initials: M
authors.lastname: Senda
authors.forename: Yuta
authors.initials: Y
authors.lastname: Aoki