International Workshop on Holography and Related Technologies 2013 (IWH2013), Kitami, 17a-3(2013.10.17).

Development of an integrated design system for computer holography
Shumpei Murata,1) Kyoji Matsushima,1) Daichi Fujita1), and Sumio Nakahara2)
1)
Department of Electrical and Electronic Engineering, Kansai University
2)
Department of Mechanical Engineering, Kansai University
3-3-35 Yamate-cho, Suita, Osaka 564-8680, Japan

1. Introduction
Recently, various rendering techniques for creating polygon-based high-definition computer-generatedholograms (HD-CGH) have been reported. By using these techniques, several HD-CGHs such as “Shion” [1],“Metal Venus II” [2], and “Brothers” [3] are created and reported. Furthermore, in digitized holography thatrecords the field of a real-existing physical object by digital holography and reconstructs it as CGHs [4], aCGH named “Hamsters” is reported, in which several resized real objects and virtual objects are arranged in
the scene [5]. We call these techniques for creating CGHs Computer Holography. The 3D scene in computer
holography is composed of various material sources such as polygon-meshes, real-existing object field,pictures, photos, and multi-viewpoint images. However, these holograms are currently designed andproduced by researchers in computer holography, because programing is required for creating CGHs, andthus, programming skills and knowledge of wave optics is necessary for the creation. As a result, it is very
difficult for designers, who are non-expert in computer holography but expert in art & design, to design andcreate their own holographic works. In this paper, we report development status of an integrated design
system for computer holography that is designed both for non-expert designers and expert researchers incomputer holography. In this paper, we present the outline of the system and an example of creating
HD-CGHs by using the interactive design tool included in our integrated system.
2. The integrated design system
The Integrated design system consists of an interactive design tool and programming libraries for saving thedesigned 3D scenes as XML-format files. The interactive design tool is intended to be used by designers who
are non-expert in computer holography but expert in art & design. Thus, the tool has a GUI that makes it
possible to preview the 3D scene, arrange source materials and set parameters of the materials. Designers cancreate the scene only by adding and editing the materials, as they verify the 3D scene on the PC screen.
The programming library included in the system is C++ class libraries in that components corresponding
to source materials are defined and handled. These components composing a 3D scene have types such as 3D
objects expressed by polygon-mesh models, 2D objects by digital images or digital wave-fields of a realobject. Each type has common parameters such as the position in the scene and specific parameters such asshading parameters. The scene data expressed as components and the lists is easily saved as XML-format
files and reused by using methods implemented in the library. Therefore, a 3D scene designed and saved byartists using the interactive design tool, can be reused by researchers in order to create CGHs by their
original codes or algorithms.
3. Making of a hologram using the interactive design tool
The 3D scene is shown in Fig.1. This scene is only composed of polygon-meshed 3D objects without anyother type of materials. Each 3D object is rendered by UV texture mapping. The main window of the tool isshown in Fig.2. The component list is indicated on the upper-right pane of the window. By pressing “Edit” or“Add” button, the parameter setting panel for the selected components is opened, as shown in Fig.3. In thispanel, designers set the material file such as polygon mesh files prepared by using conventional CG modeler.
Designers also set the positions in the scene and some other detailed parameters. This sequence is repeated asInternational Workshop on Holography and Related Technologies 2013 (IWH2013), Kitami, 17a-3(2013.10.17).

Table.1 Parameters of “Aqua3”2121212132

Units: mm

21212121104

CGH

Number of pixels

131,072×65,536

Pixel pitches

0.8µm×1.0µm

Number of segment

2×4

Number of objects
Viewing angle(H×V)

1047°×37°

Fig.1 the 3D scene of a hologram “Aqua3”

checking the scene preview in the main window. When finishing the scene design, designers set hologram
parameters such as sampling number or intervals required to start calculation of the wave-field for the scene.
As a result, only using this tool, designers can synthesize the field of the designed 3D scene. The opticalreconstruction of the hologram designed by this tool is shown in Fig.4.
4. Conclusion
We are developing the integrated design system for computer holography that is mainly for non-expert
designers in computer holography. The interactive tool included in the system makes it possible to produce ahologram with high designability. This work was supported by research grants from the JSPS (KAKENHI,24500113) and the MEXT strategic research foundation at private universities (2013-2017).
References[1] K. Matsushima, H. Nishi, S. Nakahara, “Simple wave-field rendering for photorealistic reconstruction inpolygon-based high-definition computer holography,” J. Electron. Imaging 21, 023002 (2012).
[2] H. Nishi, K. Matsushima, S. Nakahara: “Advanced rendering techniques for producing specular smoothsurfaces in polygon-based high-definition computer holography”, SPIE Proc. 8281, 828110 (2012).
[3] K. Matsushima, S. Nakahara, Y. Arima, H. Nishi, H. Yamashita, Y. Yoshizaki, K. Ogawa: “Computerholography: 3D digital art based on high-definition CGH”, International Symposium on Display Holography
2012 (ISDH2012), J. Phys.: Conf. Ser. 415, 012053(2013).
[4] K. Matsushima, Y. Arima, S. Nakahara: “Digitized holography: modern holography for 3D imaging of virtualand real objects”, Appl. Opt. 50, H278-H284 (2011).
[5] D. Fujita, K. Matsushima, and S. Nakahara, "Digital resizing of reconstructed object images in digitized
holography," OSA Topical Meeting on Digital Holography andThree-Dimensional Imaging 2013, Hawaii, DW2A.7(2013).

Fig.2 The main window of theinteractive design tool.

Fig.4 Optical reconstruction of “Aqua3” designed Fig.3 The panel for component
parameters.
by the interactive design tool.