| Title | Parallel Intra Prediction for Video Coding |
| Author | Andrew Segall, Jie Zhao (Sharp Labs of America, U.S.A.), Tomoyuki Yamamoto (Sharp Corporation, Japan) |
| Page | pp. 310 - 313 |
| Keyword | intra prediction, video coding, parallel |
| Abstract | In this paper, we propose an intra-prediction system that is both parallel friendly and with high coding efficiency. This is achieved by combining a novel prediction strategy that reduces serial dependencies and a novel, multi-directional and adaptive prediction system. The resulting technique is compared with state-of-the-art ITU-T H.264/MPEG-4 AVC. We observe a 2x and 8x increase in parallelism for 8x8 and 4x4 partitions, respectively, and an average rate increase of less than 0.08% for predictive coding scenarios. |
| Title | Quantization Noise Reduction in Hybrid Video Coding by a System of Three Adaptive Filters |
| Author | Matthias Narroschke (Panasonic R&D Center Germany GmbH, Germany) |
| Page | pp. 314 - 317 |
| Keyword | Video coding, Noise reduction, Quantization noise, Wiener filter |
| Abstract | Hybrid video coding algorithms, e.g. H.264/MPEG-4 AVC, apply
prediction and subsequent prediction error coding introducing quantization noise. The quantized prediction error signal and the prediction signal are added for reconstruction. Deblocking filters reduce quantization noise of the reconstructed signal at block boundaries. To further reduce quantization noise, adaptive Wiener filters are applied to the deblocked signal. In this paper, the adaptive Wiener filter is extended to a system of three adaptive filters in order to improve the quantization noise reduction. A first filter is applied to the deblocked signal, a second filter to the quantized prediction error signal, and a third filter to the prediction signal. The three filtered signals are added for reconstruction. For a set of thirteen test sequences, the system of three adaptive filters achieves an average bit rate reduction at the same quality of 1.9% compared to the adaptive Wiener filter and of 4.9% compared to no Wiener filter. For particular sequences, a bit rate reduction of 6.1% is achieved compared to the adaptive Wiener filter and of 17.1% compared to no Wiener filter. |
| Title | Spatio-Temporal Prediction in Video Coding by Non-Local Means Refined Motion Compensation |
| Author | Jürgen Seiler, Thomas Richter, André Kaup (University of Erlangen-Nuremberg, Germany) |
| Page | pp. 318 - 321 |
| Keyword | Video Coding, Prediction, Signal Extrapolation |
| Abstract | The prediction step is a very important part of hybrid video codecs. In this contribution, a novel spatio-temporal prediction algorithm is introduced. For this, the prediction is carried out in two steps. Firstly, a preliminary temporal prediction is conducted by motion compensation. Afterwards, spatial refinement is carried out for incorporating spatial redundancies from already decoded neighboring blocks. Thereby, the spatial refinement is achieved by applying Non-Local Means denoising to the union of the motion compensated block and the already decoded blocks. Including the spatial refinement into H.264/AVC, a rate reduction of up to 14 % or respectively a gain of up to 0.7 dB PSNR compared to unrefined motion compensated prediction can be achieved. |
| Title | A Novel Video Coding Scheme for Super Hi-Vision |
| Author | Shun-ichi Sekiguchi, Akira Minezawa, Kazuo Sugimoto (Information Technology R&D Center, Mitsubishi Electric Corporation, Japan), Atsuro Ichigaya, Kazuhisa Iguchi, Yoshiaki Shishikui (Science & Technology Research Laboratories, NHK, Japan) |
| Page | pp. 322 - 325 |
| Keyword | video coding, SHV, motion compensation prediction, intra prediction, transform |
| Abstract | We propose a novel video coding scheme targeting Super Hi-Vision (SHV) video sources. While it takes a conventional block-based MC + Transform hybrid coding approach that is suitable for hardware implementation of a SHV video codec, the proposed scheme achieved significant coding efficiency improvement by introducing several coding tools such as intra prediction and adaptive transform. According to our experimental analysis, the proposed scheme achieves significant bit-rate saving compared to the state-of-the-art AVC/H.264 high profile. |