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Bilateral adaptive quantization in HEVC

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Abstract

In this paper, we proposed an adaptive quantization algorithm for High Efficiency Video Coding (HEVC) to boost the encoding performance. The transform coefficients in a Transform Unit (TU) inherit the energy concentration property. However, they are equally quantized before entropy coding. With equal quantization technique, the energy distribution of transform coefficients and the scanning pattern following the quantization stage is not properly considered. In order to quantize the coefficients adaptively, we proposed an improved algorithm to quantize the coefficients. For each coefficient, both the magnitude and its ordinal number scanned in entropy coding process are taken into account. The quantization parameter of each coefficient in a TU is adaptively calculated by the bilateral factors accordingly. We tested our method on the latest HM16.0. An average performance of -0.27% on BD-Rate and 7.07% computing time saving are achieved in the case of the commonly used Low Delay P configuration, which demonstrated the effectiveness of the proposed algorithm.

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Acknowledgements

This work has been supported by NSFC Grant No. 61401337, 61222101, the Key Research and Development Program of Shaanxi province (2017KJXX-50), the 111 Project (B08038), and Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences. We would like to thank Ms. Yuan Jia from ISN lab of Xidian Univsity for her great help on paper revision, language editing and proof reading.

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  1. School of Telecommunications Engineering, State Key Laboratory of Integrated Service Networks, Xidian University, Xi’an, 710071, China

    Sanchun Li & Rui Song

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  1. Sanchun Li
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  2. Rui Song
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Correspondence to Rui Song.

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Li, S., Song, R. Bilateral adaptive quantization in HEVC. Multimed Tools Appl 78, 2385–2399 (2019). https://doi.org/10.1007/s11042-018-6312-y

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