Intra prediction with adaptive CU processing order in HEVC

The High Efficiency Video Coding (HEVC) utilizes Z-scan order to process coding units (CUs). For intra prediction, this order cannot fully exploit the spatial correlation between adjacent CUs. After transform and quantization, the residue still contains lots of energy along edges which consumes many...

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Bibliographic Details
Published in2014 IEEE International Conference on Image Processing (ICIP) pp. 3724 - 3728
Main Authors Amin Zheng, Au, Oscar C., Yuan Yuan, Haitao Yang, Jiahao Pang, Yonggen Ling
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.10.2014
Subjects
adaptive CU processing order
Buildings
Encoding
HEVC
Image edge detection
intra prediction
Prediction algorithms
Signal processing algorithms
Video coding
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Summary:The High Efficiency Video Coding (HEVC) utilizes Z-scan order to process coding units (CUs). For intra prediction, this order cannot fully exploit the spatial correlation between adjacent CUs. After transform and quantization, the residue still contains lots of energy along edges which consumes many bits for compression. To effectively reduce the residue energy along edges, a novel intra prediction approach is proposed, where the CU processing order is changed adaptively. Two additional orders are introduced in this paper besides traditional Z-scan order. Up to 1.9% bit saving is achieved in our experiments on HEVC test model. We also propose two fast order selection algorithms and the observed gains are obtained with 27% and 2% encoding time increase compared to HEVC, respectively.
ISSN:1522-4880
2381-8549
DOI:10.1109/ICIP.2014.7025756