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70. Fast mode decision for MPEG-4 AVC/H.264 using spatio-temporal correlation.

Author

Choi, Kiho, Lee, Sunyoung, and Jang, Euee S.

Abstract

The latest video coding standard, MPEG-4 AVC/H.264 provides the best performance in compression efficiency among existing video coding standards. To achieve higher compression efficiency, AVC/H.264 standard employs a variety of encoding tools but at the expense of greater computational complexity of the encoder. In this paper, we propose a fast mode decision algorithm for the design of a fast AVC/H.264 encoder by exploiting spatio-temporal correlation of macro block (MB) mode types. Through the statistical analysis of encoding mode types in AVC/H.264 JM 11.0, we found that the best mode type of the current MB is highly correlated with the mode types of spatially neighboring MBs and temporally collocated MBs. The experimental results showed that AVC/H.264 encoder using our proposed method produced about 66 % speedup without noticeable visual degradation compared to the AVC/H.264 JM 11.0 encoder. [ABSTRACT FROM PUBLISHER]

Published
2012
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74. Adaptive search range adjustment scheme for fast motion estimation in AVC/H.264.

Author

Lee, Sunyoung, Choi, Kiho, and Jang, Euee S.

Subjects
*ESTIMATION theory, *VIDEO coding, *MACHINE theory, *PARTITION coefficient (Chemistry), *ENCODING, *ELECTRONIC data processing
Abstract

AVC/H.264 supports the use of multiple reference frames (e.g., 5 frames in AVC/H.264) for motion estimation (ME), which demands a huge computational complexity in ME. We propose an adaptive search range adjustment scheme to reduce the computational complexity of ME by reducing the search range of each reference frame-from the (t-1)'th frame to the (t-5)'th frame-for each macroblock. Based on the statistical analysis that the 16×16 mode type is dominantly selected rather than the other block partition mode types, the proposed method reduces the search range of the remaining ME process in the given reference frame according to the motion vector (MV) position of the 16×16 block ME. In the case of the (t-1)'th frame, the MV position of the 8×8 block ME-in addition to that of 16×16 block ME-is also used for the search range reduction to sub-block partition mode types of the 8×8 block. The experimental results show that the proposed method reduces about 50% and 65% of the total encoding time over CIF/SIF and full HD test sequences, respectively, without any noticeable visual degradation, compared to the full search method of the AVC/H.264 encoder. [ABSTRACT FROM AUTHOR]

Published
2011
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