26.Image Processing by John G. Webster (Editor)

By John G. Webster (Editor)

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The type of redundancy that fractal coding methods use is that of similarity across scale. This is based on the assumption that important image features, including straight edges and corners, do not change significantly under change of scale (see Fig. 6). For example, a small part of a straight edge in an image may look similar to a larger part of the same edge in that image. Encoding. Just like any image-coding system, a fractal coding system has an encoder and a decoder. In the encoder, an image is first partitioned into small nonoverlapping blocks, called range blocks.

18. G. A. Rakuljic V. Leyva A. Yariv Optical data storage by using orthogonal wavelength-multiplexed volume holograms, Opt. , 17: 1471–1473, 1992. 19. A. Pu et al. Storage density of peristhropic multiplexing, OSA Annu. , Dallas, TX, 1994. 20. K. Curtis A. Pu D. Psaltis Method for holographic storage using peristrophic multiplexing, Opt. , 19: 993–994, 1994. 21. D. Psaltis et al. Holographic storage using shift multiplexing, Opt. , 20: 782–784, 1995. 22. G. Barbastathis et al. Holographic 3D disks using shift multiplexing, Proc.

46) and (47) yields where or Equation (49) describes the trade-off between storage density and the read data rate under the situation. At a relatively modest data rate, n limited and Eq. (49) is approximated by Equation (51) teaches that Dd will be constant first and then fall off when Eq. (50) no longer holds. See Fig. 18. Also, it is quite clear from Eqs. (49) and (51) that the larger SNRpg is with respect to SNR and the smaller the media noise index is, the higher the storage density will be.

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