DocumentCode :
1517961
Title :
Enhanced Adaptive Loop Filter for Motion Compensated Frame
Author :
Yoo, Young-Joe ; Seo, Chan-Won ; Han, Jong-Ki ; Nguyen, Truong Q.
Author_Institution :
Dept. of Inf. & Commun. Eng., Sejong Univ., Seoul, South Korea
Volume :
20
Issue :
8
fYear :
2011
Firstpage :
2177
Lastpage :
2188
Abstract :
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.
Keywords :
adaptive filters; filtering theory; image coding; interpolation; motion compensation; motion estimation; video coding; adaptive interpolation filter; coding efficiency; deblocking filtering; enhanced adaptive loop filter; motion compensated frame; optimized loop filter; rate-distortion cost; residual signal; Adaptive filters; Encoding; Indexes; Interpolation; Pixel; Redundancy; Video coding; Adaptive loop filter; inter coding; motion compensation;
fLanguage :
English
Journal_Title :
Image Processing, IEEE Transactions on
Publisher :
ieee
ISSN :
1057-7149
Type :
jour
DOI :
10.1109/TIP.2011.2155075
Filename :
5768079
Link To Document :
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