T. S. Huang et al., "Design considerations in PCM transmission of lowresolution monochrome still pictures," Proc. IEEE, vol. 55, pp. 331--335, Mar. 1967.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....assignments with low implementation complexities. Various families of recursively defined index assignments have been extensively studied in the past, including the well known Natural Binary Code (NBC) Folded Binary Code (FBC) Two s Complement Code (TCC) and Gray Code (GC) 29] Huang [30] [32] computed distortion formulas for the Natural Binary Code and the Gray Code for uniform scalar quantizers and uniform scalar sources. He asserted that the Natural Binary Code was optimal among all possible index assignments for the uniform source [31] This was proven by Crimmins et al. 33] and ....

....Index Assignments: Here we specialize Theorem 2 to the FBC, the GC, the NBC, and the affine translates of the NBC. The formulas presented generalize those given in [49] for the uniform scalar quantizer case (the , notation is consistent with [49] and generalize those given in [30] and [32] to nonsymmetric channels. Also, by letting , the special cases of M EHES AND ZEGER: BINARY LATTICE VECTOR QUANTIZATION 91 Corollaries 2 4 for the uniform output distribution case are recovered. Corollary 6: Given the conditions of Theorem 2, the channel distortion of the affine translate of the ....

T. S. Huang et al., "Design considerations in PCM transmission of lowresolution monochrome still pictures," Proc. IEEE, vol. 55, pp. 331--335, Mar. 1967.

....NOISE As mentioned before, the addition 49 noise to a severely quantized image can help remove quantization distortion. This was tried for monochromatic images by Goodall [16] and Roberts [42] They found that black and white images can be quantized to 3 or 4 bits with good results. Huang et al. [20] point out that this noise addition succeeds because the eye objects more to structured noise than unstructured noise. The lesson is that it is best to transform quantization noise into random noise. Two examples of the addition of color noise are shown in figures 19 and 20. ....

Huang, T. S., O. J. Tretiak, B. T. Prasada, and Y. Yamaguchi, "Design Considerations in PCM Transmission of Low-Resolution Monochrome Still Pictures," Proc. IEEE, Vol. 55, No. 3, Mar. 1967, p. 331.

....the performance of such a system can be significantly affected by the choice of index assignment. The problem of algorithmically finding good index assignments has been previously studied in [1, 2, 3, 4, 5, 6] and analytic formulas have been found for binary symmetric channels and certain sources [7, 8, 9, 10, 11, 12]. The optimality of the Natural Binary Code was conjectured in [8] and proved in [10] for uniform scalar quantization of a uniform source, and later extended to binary lattice vector quantizers with equiprobable quantization points in [11] In this paper we derive an index assignment which ....

T. S. Huang et al., "Design Considerations in PCM Transmission of Low-Resolution Monochrome Still Pictures," Proceedings of the IEEE, vol. 55, pp. 331--335, March 1967.

....fact, many useful digital channels have bit error probabilities in the range 10 Gamma3 to 10 Gamma1 . One approach to circumventing loss of synchronization on noisy channels is to use fixed rate image compression techniques, and those not based upon finite state algorithms (see for example [3, 4, 5, 6, 7, 8]) However, some of these techniques have the disadvantages of not being progressive, not performing as well for good quality channels, or having extremely high computational complexity. Other techniques designed for protecting transmission of medical images across noisy channels include [9] In ....

T. S. Huang et al., "Design considerations in pcm transmission of low-resolution monochrome still pictures," Proceedings of the IEEE, vol. 55, pp. 331--335, Mar. 1967.

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T. S. Huang et al., "Design considerations in PCM transmission of lowresolution monochrome still pictures," Proc. IEEE, vol. 55, pp. 331--335, Mar. 1967.

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