| Title |
A Coding Mode Image Characteristics-based Fast Direct Mode Decision Algorithm |
| Authors |
최영호(Choi, Yung-Ho) ; 한수희(Han, Soo-Hee) ; 김낙교(Kim, Lark-Kyo) |
| DOI |
https://doi.org/10.5370/KIEE.2012.61.8.1199 |
| Keywords |
Image ; Characteristics ; Direct mode ; B frame coding ; Macroblock ; H.264 |
| Abstract |
H.264 adopted many compression tools to increase image data compression efficiency such as B frame bi-directional predictions, the direct mode coding and so on. Despite its high compression efficiency, H.264 can suffer from its long coding time due to the complicated tools of H.264. To realize a high performance H.264, several fast algorithms were proposed. One of them is adaptive fast direct mode decision algorithm using mode and Lagrangian cost prediction for B frame in H.264/AVC (MLP) algorithm which can determine the direct coding mode for macroblocks without a complex mode decision process. However, in this algorithm, macroblocks not satisfying the conditions of the MLP algorithm are required to process the complex mode decision calculation, yet suffering a long coding time. To overcome the problem, this paper proposes a fast direct mode prediction algorithm. Simulation results show that the proposed algorithm can determine the direct mode coding without a complex mode decision process for 42% more macroblocks and, this algorithm can reduce coding time by up to 23%, compared with Jin's algorithm. This enables to encode B frames fast with a less quality degradation. |