Sensors & Transducers (Dec 2014)

Fast Adaptive Coding Unit Depth Range Selection Algorithm for High Efficiency Video Coding

  • Fang Shuqing,
  • Yu Mei,
  • Chen Fen,
  • Xu Shengyang,
  • Jiang Gangyi

Journal volume & issue
Vol. 183, no. 12
pp. 245 – 252

Abstract

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The emerging high-efficiency video coding standard employs a new coding structure characterized by coding unit, prediction unit and transform unit. It improves the coding efficiency significantly, but also introduces great computational complexity on the decision of optimal coding unit, prediction unit and transforms unit sizes. To reduce the encoding complexity, a fast adaptive coding unit depth range selection algorithm is proposed. In the proposed scheme, first of all, the average depth error between adjacent and their co-located largest coding unit are utilized to determine depth range of current largest coding unit. And then, depth scaling factor in the previous and back frame are obtained to shrink the depth range. Furthermore, we also propose a depth range correction algorithm for reducing misjudgment of changes in the larger sequences. Experimental results show that the former algorithm can save encoding time of about 10% more than Shen’s algorithm with a BD-bitrates loss of 0.81 % and a BD-PSNR loss of 0.026 dB. Correction algorithm can save same encoding time of Shen’s algorithm with a BD-bitrates lowering 0.76 % and a BD-PSNR improvement of 0.028 dB.

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