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Block merging for quadtree-based video coding

: Oudin, S.; Helle, P.; Stegemann, J.; Bartnik, C.; Bross, B.; Marpe, D.; Schwarz, H.; Wiegand, T.


Cheng, I. ; Institute of Electrical and Electronics Engineers -IEEE-; IEEE Signal Processing Society:
IEEE International Conference on Multimedia and Expo, ICME 2011. Vol.1 : Barcelona, Spain, 11 - 15 July 2011
Piscataway/NJ: IEEE, 2011
ISBN: 978-1-61284-348-3
ISBN: 978-1-61284-350-6
ISBN: 978-1-61284-349-0
International Conference on Multimedia and Expo (ICME) <2011, Barcelona>
Fraunhofer HHI ()

Quadtree-based block partitioning together with motion-compensated prediction has proven to be an efficient approach in video compression. However, when dealing with spatially neighboring blocks in uniformly displaced regions, quadtree-based partitioning may lead to redundant sets of transmitted motion parameters. This paper proposes and describes a simple but efficient block merging algorithm that aims at removing those redundancies by using only a single parameter set for a whole motion-compensated region of contiguous blocks. Simulation results show that our proposed merging technique works more efficiently than the conceptually similar direct mode as, e.g., specified in H.264/AVC. Due its efficiency and simplicity, our proposed merging approach has been adopted into the first test model of the high efficiency video coding (HEVC) standardization project, as currently pursued by ITU-T VCEG and ISO/IEC MPEG.