Orders > Conference proceedings > 12th international workshop on systems, signals and image processing
(from Chapter 1: Invited Addresses and Tutorials on Signals, Coding,
 Systems and Intelligent Techniques)
| Full Citation and Abstract
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Title: |
Efficient gradient-based mode selection for intra4x4 coding in H.264/AVC |
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Author(s): |
J. C. Pujol-Alcolado, A. Martin-Navas, M. de-Frutos, F. Diaz-de-Maria |
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Address: |
Department of Signal Processing and Communications
Universidad Carlos III de Madrid, Spain
jpujol @ tsc.uc3m.es, amartin @ tsc.uc3m.es, mfrutos @ tsc.uc3m.es, fdiaz @ tsc.uc3m.es |
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Reference: |
SSIP-SP1, 2005 pp. 339 - 343 |
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Abstract/
Summary |
The H.264/AVC standard offers new tools for achieving higher compression factors than preceding standards. One of these tools is the intra 4x4 predictive coding, which allows predicting a block using nine spatial modes. A full search approach leads to an optimum solution in terms of rate-distortion; however, it can be computationally very expensive. A very efficient algorithm for Intra4x4 coding is proposed, based on selecting a reduced number of modes by means of a gradient filtering and an undemanding post-processing. The results show that our method achieves a performance very close to FS in terms of quality and bit-rate, while reducing the coding time up to a factor of 2.5. |
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