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

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

By John G. Webster (Editor)

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Object-Based Coding Scheme. Audiovisual information consists of the coded representation of natural or synthetic objects that can be manifested audibly and/or visually. On the sending side, audiovisual information is compressed, composed, and multiplexed in one or more coded binary streams that are transmitted. On the receiver side, these streams are demultiplexed, decompressed, composed, and presented to the IMAGE AND VIDEO CODING 15 Fig. 10. Processing stages in an audiovisual terminal. end user.

Holographic storage using shift multiplexing, Opt. , 20: 782–784, 1995. 22. G. Barbastathis et al. Holographic 3D disks using shift multiplexing, Proc. SPIE, 2514: 1995, pp. 355–362. 23. G. Barbastathis M. Levene D. Psaltis Shift multiplexing with spherical reference waves, Appl. , 35: 2403–2417, 1996. 24. V. N. Morozov Theory of holograms formed using a coded reference beam, Sov. J. Quantum. , 7: 961–964, 1977. 25. A. A. Vasil’ev S. P. Kotova V. N. Morozov Pseudorandom signals as key words in an associative holographic memory, Sov.

38) and (48) yields HOLOGRAPHIC STORAGE 23 Equation (52) provides the relationship among all the material parameters when the optics limit is reached. ) nor is there any significant dependence on medium thickness except for the absorption term, ead . Because it might be easier to develop media with a smaller media noise index than a larger n, we show in Fig. 19 the trade-off of χ versus n under an optics-limited situation. Several characteristics stand out clearly: (1) the required n to reach optics-limited performance is about 10 − 3 to 10 − 2 depending on the desired transfer rate (this we believe is an achievable goal for photopolymers); (2) we can make up the lack of a large n by means of lower noise index to reach the optics-limited capacity; and (3) relatively larger values of n are needed for larger transfer rates, no matter how small the noise index is.

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