NDLI: Empirical channel matched quantizer design and UEP for robust image transmission

Content Provider	IEEE Xplore Digital Library
Author	Chandramouli, R. Ranganathan, N. Ramadoss, S.J.
Copyright Year	1998
Description	Author affiliation: Center for Microelectron. Res., Univ. of South Florida, Tampa, FL, USA (Chandramouli, R.)
Abstract	Summary form only given. Channel matched quantization for image transmission over time varying channels reduces the effects of channel errors. The presence of variable length codes in compression standards like the JPEG cause error propagation due to bit errors. Unequal error protection (UEP) schemes have emerged as an effective method to combat catastrophic loss in the received signal due to burst and random errors. An empirical channel matched quantizer design algorithm that jointly optimizes the distortion due to quantization-channel noise and a new efficient UEP scheme for image transmission are proposed. The baseline JPEG encoder is used to compress the 8-bit gray level images before transmission. A slow frequency non-selective Rayleigh fading channel is considered in this study. A quantization table optimized for human visual quality is used for very low channel bit error rates. For higher bit error rates, the quantization table is matched to the channel conditions by multiplying its entries by the optimal quantization multiplication factor, M/sup / such that the average number of received image blocks in error is minimized. M/sup / is computed for each bit error rate ranging from 10/sup -4/ to 10/sup -1/ through empirical modeling of the trade-off between the quantization and the channel noise. In order to enhance the performance of the proposed system, a new UEP scheme that limits the error propagation due to variable length encoding is used. This scheme works by packing the output bits of the JPEG coder into slots of fixed size.
File Size	51881
File Format	PDF
ISBN	0818684062
ISSN	10680314
DOI	10.1109/DCC.1998.672245
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-03-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Robustness Quantization Bit error rate Image communication Image coding Transform coding Code standards Error correction codes Algorithm design and analysis Design optimization
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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