Fast Transform Unit Decision for HEVC

Jangbyung KANG  Jin-Soo KIM  Jae-Gon KIM  Haechul CHOI  

IEICE TRANSACTIONS on Information and Systems   Vol.E97-D   No.8   pp.2205-2208
Publication Date: 2014/08/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.E97.D.2205
Type of Manuscript: LETTER
Category: Image Processing and Video Processing
HEVC,  transform unit,  fast encoding,  

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For the High Efficiency Video Coding (HEVC) standard, a fast transform unit (TU) decision method is proposed. HEVC defines the TU representing a region sharing the same transformation, and it supports various transform sizes from 4×4 to 32×32 by using a quadtree of TUs. The various sizes of TUs can provide good coding efficiency, whereas it may dramatically increase encoding complexity. Assuming that a TU with highly compacted energy is unlikely to be split, the proposed method determines an appropriate TU size according to the position of the last non-zero transform coefficient. Experimental results show that this reduces encoding run time by 17.2% with a negligible coding loss of 0.78% BD-rate for the random-access scenario.