FAST INTER-MODE DECISION FOR H.264 ENCODERS BASED ON SPATIAL-TEMPORAL CORRELATION AND CODED BLOCK PATTERNS

• Main Authors: Yao-Cheng Kuo, 郭耀程
• Other Authors: Pao-Chi Chang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/93494600607998350985

碩士 === 國立中央大學 === 通訊工程研究所 === 100 === The H.264/AVC video coding standard employs several new coding techniques to achieve better coding efficiency than previous standards. However it also greatly increases computational complexity at the encoder, especially for motion estimation and mode decision. Undoubtedly, it is a challenge to utilize H.264/AVC for real-time video applications. In this thesis, we propose an efficient inter mode decision algorithm based on spatial and temporal correlation of blocks and Coded Block Patterns (CBP). The characteristics of mode distribution at different values of CBP and the amount of skip mode of spatial and temporal neighboring blocks in multiple reference frames are utilized to the early determination of the type of the current macroblock. The search candidates during inter mode decision can be significantly reduced hence encoding time saving is achieved. The proposed algorithm can significantly reduce the computational complexity while keeping the video quality. The experimental results show that the proposed algorithm can save up to 86% of total encoding time compared to fast full search in H.264/AVC reference software with negligible performance degradation.