Study on Calculation Method of Computer-Generated Hologram for Volume Data

• Material Type: 博士論文
• Title: Study on Calculation Method of Computer-Generated Hologram for Volume Data
• Author/Editor: 盧, 子祥
• Author Heading: 盧, 子祥
• Publication, Distribution, etc.: Hokkaido University
• Publication Date: 2019-03-25
• Publication Date (W3CDTF): 2019-03-25
• Alternative Title: ボリュームデータの計算機合成ホログラム計算法に関する研究
• Contributor: 坂本, 雄児; 山本, 強; 荒木, 健治; 長谷山, 美紀
• Degree grantor/type: 北海道大学
• Date Granted: 2019-03-25
• Date Granted (W3CDTF): 2019-03-25
• Dissertation Number: 甲第13524号
• Degree Type: 博士(情報科学)
• Conferring No. (Dissertation): 甲第13524号
• Text Language Code: eng
• Alias of Author: Lu, Zixiang
• NDC: 500
• Target Audience: 一般
• Note (General): Volume data are widely used in many areas, especially biomedical science and ge- ology. Visualizing volume data is very important to enable intuitive understanding of three-dimensional structures, making them easier to analyze. However, current visualization technologies of volume data cannot satisfy the requirements of hu- mans. In this thesis, I propose three CGH calculation methods for volume data : polygon-based, MIP-based, and volume rendering based methods. In the polygon- based CGH calculation method, first I do the surface extraction. The CGHs of volume data were generated using a ray tracing method. In the MIP-based CGH calction method, I use a modified ray tracing method to generate holograms of MIP models. In volume rendering based CGH calculation method, I attempt to ap- ply the diffuse reflection model to render the volume data. I calculate the CGHs for volume data using a point light based CGH method. I can display the recon- structed images and animations using an electro-holography device. These three methods can display the depth and motion parallax well. The polygon-based CGH calculation method can obtain clear reconstructed images, and I can combine the models with our own ideas by using the 3DCG editing softwares. The color and material of polygonal models can be designed independently. Compared with the polygon-based CGH calculation method, the MIP-based CGH calculation method can only generate a single-color hologram. Using the same series of volume data, the polygon-based CGH calculation method can generate a variety of holograms, can express the 3D sense of objects better than the MIP-based method. In addition, the materials of objects can be correctly expressed by the polygon-based method. The volume rendering based method can display the transparent objects and multi- layer objects well. Compared with polygon-based and MIP-based CGH calculation methods, the detail of holograms calculated by the volume rendering based CGH calculation method is better. For the computing speed, the MIP-based method is much faster than the polygon-based and volume rendering based CGH calculation methods. It is possible to generate the CGHs in real-time. The calculation time of volume rendering based method is very long. To increase the speed of calculation, I propose an elemental holograms based CGH calculation method. And I reconstruct the holographic images on an eyepiece-type electro-holographic display device.; (主査) 教授 坂本 雄児, 特任教授 山本 強, 教授 荒木 健治, 教授 長谷山 美紀; 情報科学研究科(メディアネットワーク専攻)
• DOI: 10.14943/doctoral.k13524; https://doi.org/10.14943/doctoral.k13524
• Persistent ID (NDL): info:ndljp/pid/11288196; https://dl.ndl.go.jp/pid/11288196
• Collection: 障害者向け資料
• Collection (Materials For Handicapped People:1): テキストデータ
• Collection (particular): 国立国会図書館デジタルコレクション > デジタル化資料 > 博士論文; https://dl.ndl.go.jp/collections/A00014
• Acquisition Basis: 博士論文（自動収集）
• Date Accepted (W3CDTF): 2019-06-03T12:31:31+09:00
• Date Created (W3CDTF): 2019-03
• Format (IMT): PDF
• Access Restrictions: 国立国会図書館内限定公開
• Service for the Digitized Contents Transmission Service: 図書館・個人送信対象外
• Availability of remote photoduplication service: 可
• Periodical Title (URI): http://dx.doi.org/10.14943/doctoral.k13524; http://hdl.handle.net/2115/74268
• Is Referenced By (URI): http://hdl.handle.net/2115/74266
• Data Provider (Database): 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp

• Summary, etc.: Volume data are widely used in many areas, especially biomedical science and ge- ology. Visualizing volume data is very important to enable intuitive ...