Detented quantization to suppress flicker artifacts in periodically inserted intra-coded pictures in H.264 video coding
被引:11
作者:
Chono, Keiichi
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Chono, Keiichi
Senda, Yuzo
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Senda, Yuzo
Miyamoto, Yoshihiro
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Miyamoto, Yoshihiro
机构:
来源:
2006 IEEE International Conference on Image Processing, ICIP 2006, Proceedings
|
2006年
关键词:
video coding;
transforms;
quantization;
motion compensation;
D O I:
10.1109/ICIP.2006.312711
中图分类号:
TP18 [人工智能理论];
学科分类号:
081104 ;
0812 ;
0835 ;
1405 ;
摘要:
periodically inserted Intra-coded Pictures (I-pictures) in H.264 video coding. An H.264 encoder periodically inserts I-pictures for channel hopping and random access. The coding noise pattern for I-pictures differs from that of previously appearing Predictive-coded Pictures (P-pictures) because, unlike with P-pictures, inter-frame prediction is not used with I-pictures. This discontinuity in coding noise patterns generates intra-flicker and heavily degrades subjective video quality at low bit rates. We propose Detented Quantization (DQ) to reduce the discontinuity in coding noise patterns between P-pictures and I-pictures. DQ stabilizes the representation levels of input coefficients in I-pictures on the basis of a derivation of those of the intercoded images produced from previous P-pictures. Simulation results show that DQ reduces intra-flicker by more than 50% in H.264 video coder JM8.6, and it significantly improves subjective video quality.