APSIPA Transactions on Signal and Information Processing > Vol 9 > Issue 1

Video bit-rate requirements for 8K 120-Hz HEVC/H.265 temporal scalable coding: experimental study based on 8K subjective evaluations

Yasuko Sugito, Science and Technology Research Laboratories, NHK, Japan, sugitou.y-gy@nhk.or.jp , Shinya Iwasaki, Science and Technology Research Laboratories, NHK, Japan, Kazuhiro Chida, Science and Technology Research Laboratories, NHK, Japan, Kazuhisa Iguchi, Science and Technology Research Laboratories, NHK, Japan, Kikufumi Kanda, Science and Technology Research Laboratories, NHK, Japan, Xuying Lei, Fujitsu Laboratories Ltd., Japan, Hidenobu Miyoshi, Fujitsu Laboratories Ltd., Japan, Kimihiko Kazui, Fujitsu Laboratories Ltd., Japan
 
Suggested Citation
Yasuko Sugito, Shinya Iwasaki, Kazuhiro Chida, Kazuhisa Iguchi, Kikufumi Kanda, Xuying Lei, Hidenobu Miyoshi and Kimihiko Kazui (2020), "Video bit-rate requirements for 8K 120-Hz HEVC/H.265 temporal scalable coding: experimental study based on 8K subjective evaluations", APSIPA Transactions on Signal and Information Processing: Vol. 9: No. 1, e5. http://dx.doi.org/10.1017/ATSIP.2020.4

Publication Date: 03 Feb 2020
© 2020 Yasuko Sugito, Shinya Iwasaki, Kazuhiro Chida, Kazuhisa Iguchi, Kikufumi Kanda, Xuying Lei, Hidenobu Miyoshi and Kimihiko Kazui
 
Subjects
 
Keywords
Temporal scalable video codingRequired bit-rateSubjective evaluation8K ultrahigh definition120 Hz high frame-rate
 

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In this article:
I. INTRODUCTION 
II. GENERAL 8K SUBJECTIVE EVALUATION METHOD 
III. 8K 120-Hz VIDEO ENCODER FEATURES 
IV. EXPERIMENT 1: REQUIRED BIT-RATE FOR 8K 120-Hz VIDEOS 
V. EXPERIMENT 2: APPROPRIATE BIT-RATE ALLOCATION FOR 8K 60-Hz TEMPORAL SCALABLE VIDEOS 
VI. CONSIDERATIONS 
VII. CONCLUSIONS 

Abstract

8K video parameters were designed to provide an immersive experience; meanwhile, special considerations are necessary to assess the entire screen subjectively. This paper studies the video bit-rate required for 8K 119.88-Hz (120-Hz) and 59.94-Hz (60-Hz) the high efficiency video coding (HEVC)/H.265 temporal scalable coding based on subjective evaluation experiments. To investigate the appropriate bit-rate for both 8K 120- and 60-Hz videos for broadcasting purposes, we compress 8K 120-Hz test sequences using software that emulates our real-time HEVC encoder and conduct two types of experiments. The experimental results demonstrate that the required video bit-rate for 8K 120-Hz temporal scalable coding is estimated to be 85–110 Mbps, which is equivalent to the practical bit-rate for 8K 60-Hz videos, and the appropriate bit-rate for 8K 60-Hz video in 8K 120-Hz video at 85 Mbps is assumed to be ~80 Mbps. From the analyses of the encoded videos, it is confirmed that the experimental results are primarily influenced by the image quality on the slice boundary positioned at the middle of the screen height. When conducting the experiments, we determined settings referring to an initial 8K subjective assessment; we further mention requirements for future 8K subjective evaluations from the experimental results.

DOI:10.1017/ATSIP.2020.4