Fast inter-mode decision and selective quarter-pel refinement in H.264 video coding
Yükleniyor...
Dosyalar
Tarih
2008
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
IEEE
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In H.264 video coding standard, there exist several inter - prediction modes that use macroblock partitions with variable block sizes. Choosing a rate-distortion optimal coding mode for each macroblock is essential for the best possible coding performance, but also prohibitive due to the heavy computational complexity associated with the required rate-distortion calculations. Likewise, sub-pel motion refinement improves the coding efficiency, but becomes a major computational bottleneck when integer-pel search is executed fast. In this paper, we present a simple strategy to reduce the complexity of quarter-pel refinement and inter-mode decision with minimum loss of coding efficiency. Based on the results of the half-pel motion estimation step, our method evaluates the likelihood of each inter-coding mode being optimal. Then, quarter-pel refinement and actual rate and distortion are computed for only those coding modes with sufficient chance of being optimal. We claim that this method minimizes optimal mode estimation error at a given level of refinement and mode decision complexity. Simulation results show that the algorithm speeds up quarter-pel search and inter-mode selection modules by a factor of about 6 with less than 0.12 dB PSNR loss.
Açıklama
Anahtar Kelimeler
Mode decision, Quarter-pel refinement, H.264 video coding, Motion estimation, Rate-Distortion, Computational complexity, Computational modeling, Cost function, Estimation error, PSNR, Prediction methods, Rate distortion theory, Video coding, Fast inter-mode decision, Half-pel motion estimation step, Integer-pel search, Inter-prediction modes, Macroblock partitions, Mode decision complexity, Optimal mode estimation error, Rate-Distortion calculations, Rate-Distortion optimal coding mode, Selective quarter-pel refinement, Sub-pel motion refinement, Acoustics, Electric distortion, Image quality, Motion Picture Experts Group standards, Programming theory, Signal distortion, Signal processing, Speech, Visual communication, Inter-mode decision, Image coding
Kaynak
2008 IEEE International Conference on Acoustics, Speech and Signal Processing
WoS Q Değeri
N/A
Scopus Q Değeri
N/A
Cilt
Sayı
Künye
Ateş, H. F. (2008). Fast inter-mode decision and selective quarter-pel refinement in H.264 video coding. Paper presented at the 2008 IEEE International Conference on Acoustics, Speech and Signal Processing, 1045-1048. doi:10.1109/ICASSP.2008.4517792
