IEEE Trans Image Process - Enhanced adaptive loop filter for motion compensated frame.

Tópicos

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Resumo

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.

Resumo Limpo

propos adapt loop filter remov redund current motion compens frame residu signal minim thus code effici increas loop filter coeffici offset optim frame set block minim total energi residu signal result motion estim compens optim loop filter offset appli set block filter process give code gain base upon ratedistort cost propos loop filter use motion compens frame wherea convent adapt interpol filter aif appli refer frame interpol subpixel valu anoth convent scheme adapt loop filter alf use deblock filter enhanc qualiti reconstruct frame minim energi residu signal propos loop filter can use combin aif alf experiment result show propos algorithm provid averag bit reduct compar convent havc scheme propos scheme combin aif alf code gain increas even

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