R. Wang, E.A. Riskin, and R. Ladner, "Codebook organization to enhance maximum a posteriori detection of progressive transmission of vector quantized images over noisy channels," IEEE Trans. Image Processing, Vol.5, pp. 37--48, Jan. 1996.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....[152] 153] The method has also been applied to tree 50 IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 44, NO. 6, OCTOBER 1998 structured VQ [412] It can be combined with a maximum likelihood detector to further improve performance and permit progressive transmission over a noisy channel [411] [523]. Simulated annealing has also been used to design such quantizers [140] 152] 354] Another approach to joint source and channel coding based on a quantizer structure and not explicitly involving typical channel coding techniques is to design a scalar or vector quantizer for the source ....

R. Wang, E.A. Riskin, and R. Ladner, "Codebook organization to enhance maximum a posteriori detection of progressive transmission of vector quantized images over noisy channels," IEEE Trans. Image Processing, Vol.5, pp. 37--48, Jan. 1996.

.... the presence of channel noise has been to use, on a noisy channel, a source coder designed for a noiseless channel, but with an optimized index assignment and with no explicit channel coder [8] 20] 24] Other nonredundant methods exploiting specific quantizer structures can be found in [25] [27]. In [28] a random coding argument is used to give analytic bounds on the performance of an optimal index assignment. One appealing feature of index assignments is that they require no extra channel rate nor any extra storage to implement; index assignments are implicitly contained in the ....

R.-Y. Wang, E. A. Riskin, and R. Ladner, "Codebook organization to enhance maximum a posterori detection of progressive transmission of vector quantized images over noisy channels," in ICASSP'93 (Minneapolis, MN, Apr. 1993), vol. V, pp. 233--236.

....[152] 153] The method has also been applied to tree 50 IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 44, NO. 6, OCTOBER 1998 structured VQ [412] It can be combined with a maximum likelihood detector to further improve performance and permit progressive transmission over a noisy channel [411] [523]. Simulated annealing has also been used to design such quantizers [140] 152] 354] Another approach to joint source and channel coding based on a quantizer structure and not explicitly involving typical channel coding techniques is to design a scalar or vector quantizer for the source ....

R. Wang, E.A. Riskin, and R. Ladner, "Codebook organization to enhance maximum a posteriori detection of progressive transmission of vector quantized images over noisy channels," IEEE Trans. Image Processing, Vol.5, pp. 37--48, Jan. 1996.

....transmission indices to neighboring quantization codevectors. The channel coding performance of IA has been demonstrated in [4, 7, 11, 13, 14, 15] Furthermore, IA algorithms can also be used to reduce channel distortion in variations on VQ systems, such as fullsearch progressive transmission VQ [16] and weighted universal VQ [17] Computing the optimal index assignment is an NP hard problem; for the off line IA computation given a fixed codebook, we find that a Graph Covering heuristic [15, 18] provides the best average performance. Additionally, IA can provide an improved initial codebook ....

R.-Y. Wang, E. A. Riskin, and R. Ladner, "Codebook organization to enhance maximum a posteriori detection of progressive transmission of vector quantized images over noisy channels," IEEE Transactions on Image Processing, 1995. Submitted for publication.

....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 [8] some analytic justification is given for a joint source channel coding design method. Two of the most competitive techniques for protecting images from channel noise are found in [10] and [11, 12] Another approach to protecting image coders from channel noise is to divide the ....

R.-Y. Wang, E. A. Riskin, and R. Ladner, "Codebook organization to enhance maximum a posteriori detection of progressive transmission of vector quantized images over noisy channels," IEEE Transactions on Image Processing, vol. 5, pp. 37--48, Jan. 1996.

....the channel. An alternative technique uses Maximum A Posteriori (MAP) detection to exploit the residual redundancy after source coding without the overhead of channel coding [8, 9, 10] Several MAP based channel error correction techniques for memoryless channels have been studied in recent work [9, 11, 12, 13]. In contrast to memoryless channels which are characterized by uncorrelated errors, many real world channels, such as wireless channels, tend to have errors occuring in clusters separated by relatively long error free gaps [14] This tendency of a channel to generate clusters of errors is ....

.... codebook using one of several alternative techniques including Principal Component Partitioning (PCP) 18] PCP2 based codebook organization reorders the residual redundancy in the codeword bit planes thus enabling error correction using MAP techniques and helps reduce the impact of noise on VQ [13]. This paper considers the impact of burst errors generated by a Gilbert Elliott channel [19, 20] a commonly used model for channels with memory, on VQ distortion performance for progressive image transmission. The proposed coding scheme, combining PCP based VQ coding and MAP decoding, can be ....

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R.-Y. Wang, E. A. Riskin, and R. Ladner, "Codebook organization to enhance maximum a posteriori detection of progressive transmission of vector quantized images over noisy channels," IEEE Trans. on Image Proc., vol. 5, pp. 37--48, Jan. 1996.

....WA 98195 2500 Seattle, WA 98195 2350 amohr isdl.ee.washington.edu riskin isdl.ee.washington.edu ladner cs.washington.edu Abstract In this paper we study the effects of transmission noise on fixed length coded wavelet coefficients. We extend our previous work on maximum a posteriori detectors [1] to include interbitplane information and determine which transmitted codeword was most likely corrupted into a received erroneous codeword. We present a simple method of recovering from these errors once detected and demonstrate our restoration methodology on scalar quantized wavelet coefficients ....

R.-Y. Wang, E. A. Riskin, and R. Ladner, "Codebook organization to enhance maximum a posteriori detection of progressive transmission of vector quantized images over noisy channels," IEEE Trans. on Image Proc., vol. 5, pp. 37--48, Jan. 1996.

....WA 98195 2500 Seattle, WA 98195 2350 amohr isdl.ee.washington.edu riskin isdl.ee.washington.edu ladner cs.washington.edu Abstract In this paper we study the effects of transmission noise on fixed length coded wavelet coefficients. We extend our previous work on maximum a posteriori detectors [1] to include interbitplane information and determine which transmitted codeword was most likely corrupted into a received erroneous codeword. We present a simple method of recovering from these errors once detected and demonstrate our restoration methodology on scalar quantized wavelet coefficients ....

R.-Y. Wang, E. A. Riskin, and R. Ladner, "Codebook organization to enhance maximum a posteriori detection of progressive transmission of vector quantized images over noisy channels," IEEE Trans. on Image Proc., vol. 5, pp. 37--48, Jan. 1996.

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