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Content-Adaptive Feature-Based CU Size Prediction for Fast Low-Delay Video Encoding in HEVC

Mallikarachchi, T, Talagala, Dumidu, Kodikara Arachchi, Hemantha and Fernando, Warnakulasuriya (2016) Content-Adaptive Feature-Based CU Size Prediction for Fast Low-Delay Video Encoding in HEVC IEEE Transactions on Circuits and Systems for Video Technology.

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Abstract

Determining the best partitioning structure of a Coding Tree Unit (CTU) is one of the most time consuming operations in HEVC encoding. Specifically, it is the evaluation of the quadtree hierarchy using the Rate-Distortion (RD) optimization that has the most significant impact on the encoding time, especially in the cases of High Definition (HD) and Ultra High Definition (UHD) videos. In order to expedite the encoding for low delay applications, this paper proposes a Coding Unit (CU) size selection and encoding algorithm for inter-prediction in the HEVC. To this end, it describes (i) two CU classification models based on Inter N N mode motion features and RD cost thresholds to predict the CU split decision, (ii) an online training scheme for dynamic content adaptation, (iii) a motion vector reuse mechanism to expedite the motion estimation process, and finally introduces (iv) a computational complexity to coding efficiency trade-off process to enable flexible control of the algorithm. The experimental results reveal that the proposed algorithm achieves a consistent average encoding time performance ranging from 55% – 58% and 57% – 61% with average Bjøntegaard Delta Bit Rate (BDBR) increases of 1.93% – 2.26% and 2.14% – 2.33% compared to the HEVC 16.0 reference software for the low delay P and low delay B configurations, respectively, across a wide range of content types and bit rates.

Item Type: Article
Subjects : Electronic Engineering
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
NameEmailORCID
Mallikarachchi, TUNSPECIFIEDUNSPECIFIED
Talagala, Dumidud.talagala@surrey.ac.ukUNSPECIFIED
Kodikara Arachchi, HemanthaH.Kodikaraarachchi@surrey.ac.ukUNSPECIFIED
Fernando, WarnakulasuriyaW.Fernando@surrey.ac.ukUNSPECIFIED
Date : 20 October 2016
Identification Number : 10.1109/TCSVT.2016.2619499
Copyright Disclaimer : (c) 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
Uncontrolled Keywords : HEVC, CU size, low-delay, motion classification, RD optimization, video coding
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 03 Feb 2017 15:18
Last Modified : 19 Jul 2017 09:45
URI: http://epubs.surrey.ac.uk/id/eprint/813452

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