DocumentCode :
1199303
Title :
Intra-Predictive Transforms for Block-Based Image Coding
Author :
Xu, Jizheng ; Wu, Feng ; Zhang, Wenjun
Author_Institution :
Dept. of Electron. Eng., Shanghai Jiao Tong Univ., Shanghai, China
Volume :
57
Issue :
8
fYear :
2009
Firstpage :
3030
Lastpage :
3040
Abstract :
This paper presents the theory and the design of intra-predictive transforms, which unify the inter-block prediction and block-based transforms in block-based image coding. Motivated by interpreting inter-block prediction as a transform with a larger size, we derive the concept of intra-predictive transforms. Conventional predictions and transforms can be viewed as special cases of intra-predictive transforms. Intra-predictive transforms are able to exploit both inter and intra-block correlations. We derive the tight upper bound of the coding gain of intra-predictive transforms for stationary Gaussian sources. It turns out that the coding gain can be greater than that of conventional transforms. The optimal intra-predictive transform that achieves the upper bound is also derived. We also design a practical intra-predictive transform using frequency-domain prediction that can achieve better performance in image coding while exhibiting low computational complexity. Experimental results confirm the effectiveness of the proposed intra-predictive transforms in block-based image coding systems and show the improvements over the current design.
Keywords :
block codes; frequency-domain analysis; image coding; transforms; block-based image coding; coding gain; computational complexity; frequency-domain prediction; inter-block prediction; intra-predictive transforms; stationary Gaussian sources; Image coding; Karhunen–LoÈve transform; Wiener prediction; intra prediction;
fLanguage :
English
Journal_Title :
Signal Processing, IEEE Transactions on
Publisher :
ieee
ISSN :
1053-587X
Type :
jour
DOI :
10.1109/TSP.2009.2018359
Filename :
4803779
Link To Document :
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