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Fast template matching for intra prediction

: Venugopal, G.; Merkle, P.; Marpe, D.; Wiegand, T.


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Signal Processing Society:
IEEE International Conference on Image Processing, ICIP 2017. Proceedings : 17-20 September 2017, Beijing, China
Piscataway, NJ: IEEE, 2017
ISBN: 978-1-5090-2175-8
ISBN: 978-1-5090-2174-1
ISBN: 978-1-5090-2176-5
International Conference on Image Processing (ICIP) <2017, Beijing>
Conference Paper
Fraunhofer HHI ()

Intra prediction is an important step in video coding, where spatial redundancy is exploited for coding efficiency. The state-of-the-art H.265/High Efficiency Video Coding (HEVC) standard provides 35 intra prediction modes including 33 angular modes and a DC as well as a Planar mode. Although these intra prediction methods are quite efficient, there is still room for improvements, especially when complex image structures are involved. Template matching was proposed previously for H.264/Advanced Video Coding (AVC) with up to 11% BD-rate gain. However substantial decoder complexity increase from the implied search algorithm makes it less attractive for practical applications. In this paper, we propose a fast template matching intra mode for HEVC. The proposed mode is scalable in the sense of providing different trade-offs between decoder complexity and BD-rate gains. For a specific choice of parameters, fast template matching mode can achieve an average BD-rate gain of 1.15% with a maximum BD-rate gain of up to 4.6% at a 33% increase in decoder run-time. Overall, fast template matching can provide the same coding gain as conventional template matching approaches, but with significantly less decoder complexity.