Fast Intra-Prediction Model Selection for H.264 Codec

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal

19 Scopus Citations
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Original languageEnglish
Pages (from-to)99-110
Journal / PublicationProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2003
Externally publishedYes


TitleMultimedia Systems and Applications VI
PlaceUnited States
CityOrlando, FL
Period8 - 9 September 2003


We investigate the encoding speed improvement for H.264 with a special focus on fast intra-prediction mode selection in this work. It is possible to adopt the rate-distortion (RD) optimized mode in H.264 to maximize the coding gain at the cost of a very high computational complexity. To reduce the complexity associated with the intra-prediction mode selection, we propose a two-step fast algorithm. In the first step, we make a course-level decision to split all possible candidate modes into two groups: the group to be examined further and the group to be ignored. The sizes of these two groups are adaptively determined based on the block activities. Then, in the second step, we focus on the group of interest, and consider an RD model for final decision-making. It is demonstrated by experiment results that the proposed scheme performs 5 to 7 time faster than the current H.264 encoder (JM5.0c) with little degradation in the coding gain.

Research Area(s)

  • Encoder complexity, H.264/JVT, Intra mode decision, Intra prediction