Search Word(s) in Title, Keywords, Authors, and Abstract: Mode Decision

A Fast Rough Mode Decision Algorithm for HEVC
Wei-Xin Yao, Dan Yang, Gui-Fu Lu and Jun Wang
Page: 492~499, Vol. 15, No.3, 2019
10.3745/JIPS.01.0042
Keywords: HEVC, Intra Prediction, Rough Mode Decision, Video Coding
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HEVC is the high efficiency video coding standard, which provides better coding efficiency contrasted with the other video coding standard. But at the same time the computational complexity increases drastically. Thirtyfive kinds of intra-prediction modes are defined in HEVC, while 9 kinds of intra prediction modes are defined in H.264/AVC. This paper proposes a fast rough mode decision (RMD) algorithm which adopts the smoothness of the up-reference pixels and the left-reference pixels to decrease the computational complexity. The three step search method is implemented in RMD process. The experimental results compared with HM13.0 indicate that the proposed algorithm can save 39.7% of the encoding time, while Bjontegaard delta bitrate (BDBR) is increased slightly by 1.35% and Bjontegaard delta peak signal-to-noise ratio (BDPSNR) loss is negligible.


Evaluation of the Image Backtrack-Based Fast Direct Mode Decision Algorithm
Yungho Choi and Neungsoo Park
Page: 685~692, Vol. 8, No.4, 2012
10.3745/JIPS.2012.8.4.685
Keywords: H.264/AVC, Bi-Directional Prediction, Image Backtracking, Fast Algorithm, Mode Decision
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B frame bi-directional predictions and the DIRECT mode coding of the H.264 video compression standard necessitate a complex mode decision process, resulting in a long computation time. To make H.264 feasible, this paper proposes an image backtrackbased fast (IBFD) algorithm and evaluates the performances of two promising fast algorithms (i.e., AFDM and IBFD). Evaluation results show that an image backtrackbased fast (IBFD) algorithm can determine DIRECT mode macroblocks with 13% higher accuracy, as compared with the AFDM. Furthermore, IBFD is shown to reduce the motion estimation time of B frames by up to 23% with a negligible quality degradation