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Lossless Image Coding via one-dimensional Grammar Based codes

Lossless Image Coding via One-Dimensional Grammar Based Code...

引用

2000 International Conference on Communication Technology(WCC2000·ICCT2000)

作者： En-hui Yang Jianghong Guo Department of Electrical and Computer Engineering University of Waterloo WaterlooON N2L 3G1Canada

ISBN: (纸本)0780363949

＜正＞In this paper,lossless image coding is considered from an information theoretic point of *** new coding schemes are *** the first,coding scheme,an image is first scanned in a quadrant by quadrant manner and then encoded by using a one-dimensional grammar based code which has been developed recently by Yang and Kieffer and is called the improved sequential algorithm（or simply the YK algorithm）.In the second coding scheme,an image is first,predicted by using a context template, then scanned in a quadrant by quadrant manner,and finally encoded by using the YK *** the third coding scheme,an image is first scanned in a quadrant by quadrant manner and then encoded by using a modified YK algorithm,which also includes a 2-D arithmetic code as an option to remove local 2-D *** of the nature of the YK algorithm and the scanning method,all three coding schemes can remove effectively global redundancy existing in ***,it is proved that all three coding schemes are universal and outperform asymptotically any finite 2-D block code and any finite context 2-D arithmetic code as the image size gets larger and *** small images,however,the second coding scheme is slightly more effective in removing local redundancy occurring in images than does the first,coding scheme,and the third one is the best among the *** results on bi-level images confirm our theoretic results:for images of size 512×512,our results are Comparable with those afforded by JBIG 1;for some images of size 1024×1024, our results are better than those afforded by JBIG1.

关键词： image coding arithmetic codes redundancy sequential codes prediction theory context-free grammars data compression lossless image coding one-dimensional codes grammar-based codes information theory improved sequential algorithm YK algorithm context template image scanning image prediction 2D arithmetic code local 2D redundancy global redundancy bi-level images 512 pixel 262144 pixel 1024 pixel 1048576 pixel

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