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

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Title: Study on Calculation Method of Computer-Generated Hologram for Volume Data
Other Titles: 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
Authors: 盧, 子祥1 Browse this author
Authors(alt): Lu, Zixiang1
Issue Date: 25-Mar-2019
Abstract: 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.
Conffering University: 北海道大学
Degree Report Number: 甲第13524号
Degree Level: 博士
Degree Discipline: 情報科学
Examination Committee Members: (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
Degree Affiliation: 情報科学研究科(メディアネットワーク専攻)
Type: theses (doctoral)
Appears in Collections:課程博士 (Doctorate by way of Advanced Course) > 情報科学院(Graduate School of Information Science and Technology)
学位論文 (Theses) > 博士 (情報科学)

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