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Quality Enhancement of Conventional Compression with a Learned Side Bitstream

Takahiro NARUKO, Hiroaki AKUTSU, Koki TSUBOTA, Kiyoharu AIZAWA

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Summary :

We propose Quality Enhancement via a Side bitstream Network (QESN) technique for lossy image compression. The proposed QESN utilizes the network architecture of deep image compression to produce a bitstream for enhancing the quality of conventional compression. We also present a loss function that directly optimizes the Bjontegaard delta bit rate (BD-BR) by using a differentiable model of a rate-distortion curve. Experimental results show that QESN improves the rate by 16.7% in the BD-BR compared to Better Portable Graphics.

Publication
IEICE TRANSACTIONS on Information Vol.E106-D No.8 pp.1296-1299
Publication Date
2023/08/01
Publicized
2023/04/25
Online ISSN
1745-1361
DOI
10.1587/transinf.2022EDL8096
Type of Manuscript
LETTER
Category
Image Processing and Video Processing

Authors

Takahiro NARUKO
  Hitachi, Ltd.
Hiroaki AKUTSU
  Hitachi, Ltd.
Koki TSUBOTA
  The University of Tokyo
Kiyoharu AIZAWA
  The University of Tokyo

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