NDLI: Directional Filtering Transform for Image/Intra-Frame Compression

Content Provider	IEEE Xplore Digital Library
Author	Xiulian Peng Jizheng Xu Feng Wu
Copyright Year	1992
Abstract	While directional adaption is introduced into traditional transforms, different orders of two 1-D transforms will result in different results of one 2-D transform. Based upon an anisotropic image model, this paper analyzes the effect of transform orders in terms of theoretical coding gain. Our results reveal that the transform orders have little effect on the coding gain with full decomposition, good directional modes and good interpolation. However, in practical compression schemes, since high-pass bands are not decomposed fully because of the consideration on complexity, different transform orders have different coding performances, which can be solved by an adaptive transform order. Motivated by our analyzed results, a directional filtering transform (dFT, in order to distinguish from the common usage on DFT) is proposed in this paper to better exploit correlations among samples in H.264 intraframe coding. It provides an evenly distributed set of prediction modes with an adaptive transform order. Both interblock and intrablock correlations are exploited in this scheme. Experimental results in H.264 intraframe coding demonstrate its superiority both objectively and subjectively.
Sponsorship	IEEE Signal Processing Society
Page Count	12
File Size	2580015
Starting Page	2935
Ending Page	2946
File Format	PDF
ISSN	10577149
Volume Number	19
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Filtering Image coding Discrete wavelet transforms Interpolation Wavelet transforms Decoding Anisotropic magnetoresistance Adaptive filters Discrete cosine transforms Asia lifting-based wavelet transform Adaptive directional filtering adaptive lifting order H.264 intraframe coding
Content Type	Text
Resource Type	Article
Subject	Computer Graphics and Computer-Aided Design Software

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