NDLI: Improved MPEG-4 visual texture coding using double transform coding

Content Provider	IEEE Xplore Digital Library
Author	Chung-Neng Wang Tihao Chiang Chi-Min Liu Hung-Ju Lee
Copyright Year	2001
Description	Author affiliation: Nat. Chiao Tung Univ., Hsinchu, Taiwan (Chung-Neng Wang)
Abstract	MPEG-4 Visual Texture Coding (VTC) was recently adopted as an image coding technique using a wavelet-based approach. For images with significant texture and sharp contrast, MPEG-4 VTC spreads the signal energy over several wavelet trees. To improve the coding efficiency of zerotree entropy coding, we propose a double transformation coding (DTC) approach. The wavelet trees are reorganized as a sequence of wavelet blocks, which are categorized into four groups where the similarity among the blocks within a group is increased. For each class, we use an adaptive Karhunen Loeve Transform (KLT) bases to predict the quantized AC coefficients of the same class. The classification process is based on the variances of the quantized DC coefficients considering the spatial orientation. Thus, the classification information can be computed at the decoder. At the same time, the property of continuous scalability is maintained using the new approach. For the same bitrate we found that the DTC achieved a coding gain over MPEG-4 VTC by about 0.5-1.0 dB in PSNR.
Sponsorship	IEEE Circuits & Syst. Soc
Starting Page	227
Ending Page	230
File Size	409318
Page Count	4
File Format	PDF
ISBN	0780366859
DOI	10.1109/ISCAS.2001.922026
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-05-06
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	MPEG 4 Standard Transform coding Frequency Discrete wavelet transforms Laboratories Image coding Wavelet coefficients Entropy coding Wavelet transforms Decoding
Content Type	Text
Resource Type	Article

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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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