Keita Ashizawa

アシザワケイタ | Keita Ashizawa

Affiliation and department：
Homepage URL (1)： http://asssy.sakura.ne.jp/

Research field (3)： Applied mathematics and statistics , Basic mathematics , Perceptual information processing

Research keywords (4)：画像情報処理 , 画像圧縮 , ウェーブレット解析 , 応用数学

Research theme for competitive and other funds (3)：

2024 - 2027 符号化部からフィードバック設計した可逆画像圧縮方式の開発
2021 - 2024 空撮画像や点群データのための可逆圧縮方式の開発
2017 - 2019 点列データの相関を利用した効率的な信号圧縮法の開発

Papers (17)：

Masayoshi Nakagawa, Yoshiki Takasan, Keita Ashizawa, Katsu Yamatani. A computationally efficient method to improve the quality of JPEG images based on linear modelling. JSST2024 Conference Proceedings. 2024
Keita Ashizawa, Katsu Yamatani. A new pre-coding approach for MPROT-based image compression. JSST2023 Conference Proceedings. 2023. 48-50
Kensuke Fujinoki, Keita Ashizawa. Directional lifting wavelet transform for image edge analysis. Signal Processing. 2023. 109188-109188
森田雅貴, 芦澤恵太, 山谷克. エッジと平行方向の直流成分に対するハール変換を用いたモスキートノイズの軽減方法. 画像電子学会誌. 2020. 49. 1. 3-11
K. Fujinoki, K. Ashizawa. Directional Lifting-based Wavelet Transforms and their Applications. Proceedings of Ninth International Conference on Information. 2018. 47. 50

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MISC (17)：

森田雅貴, 芦澤恵太, 山谷克. Edge Direction Prediction by Principal Component Analysis of Gradient Data and Its Application to Image Compression. 画像電子学会年次大会予稿集(CD-ROM). 2022. 50th
Kensuke Fujinoki, Keita Ashizawa. Directional Lifting Wavelet Transform for Image Edge Analysis. 2021
藤ノ木健介, 芦澤恵太. 重複ウェーブレット変換と画像処理への応用. 統計数理研究所共同研究リポート「複雑系の逆問題とその周辺」. 2017. 1-10
Ashizawa Keita, Harada Takuya, Yamatani Katsu. A Block-based Lossy Image Compression Using The Wavelet Transform (Wavelet analysis and signal processing). RIMS Kokyuroku. 2016. 2001. 83-94
芦澤恵太, 森田雅貴. DCTとウェーブレット変換を縦横に組み合わせた直交変換をブロック毎に用いる適応的画像圧縮法. 平成28年度数学協働プログラム:ウェーブレット理論と工学への応用. 2016. 15-27

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Lectures and oral presentations (15)：

離散ウェーブレット変換係数の線形量子化の拡張と圧縮画像への効果について
(日本応用数理学会第20回研究部会連合発表会 2024)
遷移域を有する階段関数によるDWT係数量子化とその圧縮画像への影響
(画像電子学会第307回研究会 2024)
A new pre-coding approach for MPROT based image compression
(The 42nd JSST Annual International Conference on Simulation Technology (JSST2023) 2023)
Edge enhancement with directional wavelet transform
(The 10th International Congress on Industrial and Applied Mathematics (ICIAM 2023) 2023)
Improvement of Coding Procedures for Haar Transform-based Lossy Image Compression
(The 10th International Congress on Industrial and Applied Mathematics (ICIAM 2023) 2023)

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Education (3)：

2003 - 2006 Shizuoka University Graduate School of Science and Engineering
2001 - 2003 Shizuoka University Graduate School of Science and Engineering
1997 - 2001 Shizuoka University Faculty of Engineering Department of Systems Engineering

Professional career (1)：

博士(理学) (静岡大学)

Work history (8)：

2023/04 - 現在 Shizuoka Institute of Science and Technology Faculty of Informatics Department of Computer Science
2019/04 - 2023/03 Maizuru National College of Technology Department of Electrical and Computer Engineering
2013/04 - 2019/03 Maizuru National College of Technology Department of Electrical and Computer Engineering
2016/08 - 2017/03 Meijo University Faculty of Urban Science
2011/01 - 2013/03 Maizuru National College of Technology Department of Electrical and Computer Engineering

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Association Membership(s) (3)：

THE JAPAN SOCIETY FOR INDUSTRIAL AND APPLIED MATHEMATICS , THE INSTITUTE OF IMAGE INFORMATION AND TELEVISION ENGINEERS , THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS

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