Enhanced Adaptive Loop Filter for Motion Compensated Frame

We propose an adaptive loop filter to remove the redundancy between current and motion compensated frames so that the residual signal is minimized, thus coding efficiency increases. The loop filter coefficients and offset are optimized for each frame or a set of blocks to minimize the total energy o...

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Bibliographic Details
Published in:IEEE transactions on image processing 2011-08, Vol.20 (8), p.2177-2188
Main Authors: Young-Joe Yoo, Chan-Won Seo, Jong-Ki Han, Nguyen, T. Q.
Format: Article
Language:English
Subjects:
Adaptive filters
Adaptive loop filter
Applied sciences
Coding
Detection, estimation, filtering, equalization, prediction
Encoding
Energy conservation
Exact sciences and technology
Filtering
Filtration
Frames
Gain
Image processing
Indexes
Information, signal and communications theory
inter coding
Interpolation
motion compensation
Offsets
Pixel
Redundancy
Signal and communications theory
Signal processing
Signal, noise
Studies
Telecommunications and information theory
Video coding
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Description
Summary:We propose an adaptive loop filter to remove the redundancy between current and motion compensated frames so that the residual signal is minimized, thus coding efficiency increases. The loop filter coefficients and offset are optimized for each frame or a set of blocks to minimize the total energy of the residual signal resulting from motion estimation and compensation. The optimized loop filter with offset is applied for the set of blocks where the filtering process gives coding gain based upon rate-distortion cost. The proposed loop filter is used for the motion compensated frame whereas the conventional adaptive interpolation filter (AIF) is applied to the reference frames to interpolate the subpixel values. Another conventional scheme adaptive loop filter (ALF), is used after deblocking filtering to enhance quality of reconstructed frames, not to minimize energy of residual signal. The proposed loop filter can be used in combination with the AIF and ALF. Experimental results show that proposed algorithm provides the averaged bit reduction of 8% compared to conventional H.264/AVC scheme. When the proposed scheme is combined with AIF and ALF, the coding gain increases even further.
ISSN:1057-7149
1941-0042
DOI:10.1109/TIP.2011.2155075