Digital watermarking by a holographic technique.

  title={Digital watermarking by a holographic technique.},
  author={Nobukatsu Takai and Yuto Mifune},
  journal={Applied optics},
  volume={41 5},
A holographic technique is applied for digital watermarking by a computer. A digital-watermark image to be hidden is phase modulated in a random fashion, and its Fourier-transformed hologram is superposed on a content image. The watermark is reconstructed by means of a holographic-reconstruction technique from the bit-map image that hides it. In the study the processes of constructing and reconstructing a digital hologram are described on the basis of the theory of Fourier optics. The… CONTINUE READING
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