A Single-Chip 4K 60-fps 4:2:2 HEVC Video Encoder LSI Employing Efficient Motion Estimation and Mode Decision Framework with Scalability to 8K

Takayuki Onishi, Takashi Sano, Yukikuni Nishida, Kazuya Yokohari, Ken Nakamura, Koyo Nitta, Kimiko Kawashima, Jun Okamoto, Naoki Ono, Atsushi Sagata, Hiroe Iwasaki, Mitsuo Ikeda, Atsushi Shimizu

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

A professional-image-quality video encoder LSI for broadcasting and content distribution has been developed with single-chip 4K 60-fps 4:2:2 high-efficiency video coding (HEVC) encoding capability and 8K ultrahigh definition television scalability. Edge-based intramode pruning and statistically adaptive multiblock-size motion estimation (ME) efficiently reduce HEVC's high computational complexity for real-time processing, while a deeply centralized-mode decision framework maintains high compression performance. Internal reference image caches with 797-Gb/s image feed capability support the 768-GOPS ME computation of distributed motion vector search. Interchip pictures and data exchange features with high-speed data buses are also used for multichip 8K encoding configuration. A subjective evaluation showed that the proposed encoder LSI maintained the same visual quality as an encoder LSI complying with the previous standard while reducing bit rate by 40%. The chip was designed and fabricated in a 28-nm CMOS technology and used to build industry-leading 4K and 8K broadcasting systems.

Original languageEnglish
Article number8388869
Pages (from-to)1930-1938
Number of pages9
JournalIEEE Transactions on Very Large Scale Integration (VLSI) Systems
Volume26
Issue number10
DOIs
Publication statusPublished - 2018 Oct
Externally publishedYes

Keywords

  • Digital video broadcasting
  • high-efficiency video coding (HEVC)
  • motion estimation (ME)
  • multichip configuration
  • video codecs

ASJC Scopus subject areas

  • Software
  • Hardware and Architecture
  • Electrical and Electronic Engineering

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