The Evaluation of Low Bit Rate and Multi-Component Image Compression Algorithms for Inclusion in the National Imagery Transmission Format Standard (NITFS)
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چکیده
The discrete wavelet transform has proven to be an effective technique for the compression of digital imagery at very low rates. This has lead to increasing interest in commercial, intemational, medical, and governmental arenas in the wide-spread use and standardization of this technology. As the popularity of wavelet based image compression systems grows, issues regarding the transmission of wavelet-compressed imagery must be addressed. The analysis, correction, and containment of bit errors in the transmission of wavelet-compressed imagery represents a challenging area of research. The focus of this paper is to investigate transmission error effects in an adaptive wavelet image coder that utilizes universal trellis-coded quantization (UTCQ) [I, 21 and adaptive arithmetic coding [3 51 to generate coded -5 -3 bitstrearns, and propose a re-initialization mechanism for error recovery. Bit error rates (BERs) in the 10 to 10 range are considered and the visual manifestations of bit errors in the reconstructed image are shown. The usage of a trellis quantizer complicates error containment since corrupted quantization indices may lead to loss of tracking of the trellis state and propagation of decoding error. Comparisons to NZTFS-JPEG, where restart intervals are mandated to minimize error propagation, are made.
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تاریخ انتشار 1996