 |
Technical Program
Paper Detail
| Paper: | TP-L3.7 |
| Session: | Image and Video Coding - I |
| Time: | Tuesday, October 10, 16:40 - 17:00 |
| Presentation: |
Lecture
|
| Title: |
DETENTED QUANTIZATION TO SUPPRESS FLICKER ARTIFACTS IN PERIODICALLY INSERTED INTRA-CODED PICTURES IN H.264 VIDEO CODING |
| Authors: |
Keiichi Chono; NEC Corporation | | | | | Yuzo Senda; NEC Corporation | | | | | Yoshihiro Miyamoto; NEC Corporation | | |
| Abstract: |
This paper describes a new flicker suppression method for 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 inter-coded 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. |
|
