Visual Quality Balancing between Enhanced High-resolution and OrdinaryJPEG-decoded Images in Steganographic Image Compression System

URI http://harp.lib.hiroshima-u.ac.jp/it-hiroshima/metadata/12415
ファイル
タイトル
Visual Quality Balancing between Enhanced High-resolution and OrdinaryJPEG-decoded Images in Steganographic Image Compression System
著者
氏名 古川 功
ヨミ フルカワ イサオ
別名 Isao FURUKAWA
氏名 鈴木 純司
ヨミ スズキ ジュンジ
別名 Junji SUZUKI
キーワード
steganography, image enhancement, JPEG compression, Watson’s model, JND
抄録

 The steganographic image compression system provides a coding method that is compatible with standard JPEG, but allows only users who know that the information of higher frequency components is embedded to obtain enhanced high-resolution images at the same time. Until now, the main focus has been on improving the quality of high-resolution images by embedding as many codes as possible in lower frequency DCT coefficients. However, this conventional method leads to greater degradation in JPEG-decoded low-resolution images, and it is not appropriate to prioritize high-resolution images over low-resolution images because of the inherent duality of providable resolution images by the system. Therefore, in this study, we employ Watson’s model to evaluate the distortion caused by embedding enhancement codes to lower frequency, and extend the perceptual model to higher frequency by extrapolating DCT frequency sensitivity values to calculate visual distortion of higher frequency DCT coefficients when they are discarded due to a constraint of payload. In addition, we propose a visual quality balancing (VQB) algorithm for low- and high-resolution images by successively comparing their perceptual distances during enhancement code embedding. Finally, we demonstrate the effectiveness of the proposed algorithm through simulation experiments on standard test images with 4K resolution.

掲載雑誌名
広島工業大学紀要. 研究編
56
開始ページ
35
終了ページ
48
出版年月日
2022-03
出版者
広島工業大学
ISSN
1346-9975
NCID
AA11599110
本文言語
英語
資料タイプ
紀要論文
著者版フラグ
権利情報
publisher
区分
it-hiroshima