NDLI: Lossless interpolation optimization for H.264 decoder

Content Provider	IEEE Xplore Digital Library
Author	Ci Wang Ji Li Yuwen He
Copyright Year	2010
Description	Author affiliation: School of EE, Shanghai Jiaotong University, China (Ci Wang; Ji Li; Yuwen He)
Abstract	To improve compression capacity, motion compensation (MC) is utilized in H.264, which includes 6-tap FIR for 1/2-pel interpolation and 2-tap filter for 1/4-pel interpolation. MC uses up most decoding time, and is the expensive part of H.264 decoder. Some consumer electronics, such as smartphones, may not have enough processing capability to decode high definition video program in real time. MC must be simplified at first to reduce its computational cost for real time decoding. As for interpolation cost, 1/2-pel interpolation is the dominant one for it adopts larger tap filter and is more often used than the 1/4-pel interpolation. In this paper, we proposed an interpolation mechanism to adaptively adjust tap length of 1/2-pel interpolation filter considering image content's variation. For low frequency signal, there is strong correlation among adjacent pixels, so it is possible to use a short filter to replace original one, without introducing additional interpolation error. Therefore, we examine the frequency spectrum of image blocks and design an optimal filter at the criterion of the least interpolation distortion and tap length. We further adopted different simplification strategies for different kind picture interpolation, because the interpolation distortion in the reference pictures will be propagated into whole group of pictures and significantly reduce video quality. The experimental results show that the proposed algorithm can reduce more than 20% interpolation costs while with neglectable quality degradation.
Starting Page	148
Ending Page	151
File Size	451077
Page Count	4
File Format	PDF
ISBN	9781424474547
e-ISBN	9781424474561
DOI	10.1109/APCCAS.2010.5774733
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-12-06
Publisher Place	Malaysia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Interpolation Decoding Pixel Optimization Finite impulse response filter Adaptive filters Computational efficiency adaptive interpolation H.264 decoder interpolation filter
Content Type	Text
Resource Type	Article

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