Efficient H.264-to-HEVC transcoding based on motion propagation and post-order traversal of coding tree units

Franche, Jean-François et Coulombe, Stéphane. 2018. « Efficient H.264-to-HEVC transcoding based on motion propagation and post-order traversal of coding tree units ». IEEE Transactions on Circuits and Systems for Video Technology, vol. 28, nº 12. pp. 3452-3466.
Compte des citations dans Scopus : 8.

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Résumé

In this paper, we propose a fast H.264-to-HEVC transcoder composed of a motion propagation algorithm and a fast mode decision framework. The motion propagation algorithm creates a motion vector candidate list at the coding tree unit (CTU) level and, thereafter, selects the best candidate at the prediction unit level. This method eliminates computational redundancy by pre-computing the prediction error of each candidate at the CTU level and reusing the information for various partition sizes. The fast mode decision framework is based on a post-order traversal of the CTU and includes several mode reduction techniques. In particular, the framework permits the early termination of the rate distortion cost computation, a highly complex task, when a mode is unpromising. Moreover, a novel method exploits the data created by the motion propagation algorithm to determine whether a coding unit must be split. This allows the pruning of unpromising sub-partitions. Compared with a cascaded pixel-domain transcoding approach, the experimental results show that the proposed solution using one reference frame is on average 8.5 times faster, for an average Bjøntegaard delta-rate (BD-Rate) of 2.63%. For a configuration with four reference frames, the average speed-up is 11.77 times and the average BD-Rate is 3.82%.

Type de document:	Article publié dans une revue, révisé par les pairs
Professeur:	Professeur Coulombe, Stéphane
Affiliation:	Génie logiciel et des technologies de l'information
Date de dépôt:	23 janv. 2018 16:22
Dernière modification:	17 janv. 2020 15:30
URI:	https://espace2.etsmtl.ca/id/eprint/16177

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