2018 Fiscal Year Annual Research Report
Light field 3D display using non-planar holographic lens array screen
| Project/Area Number |
18H03281
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| Research Institution | National Institute of Information and Communications Technology |
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Principal Investigator |
ボワズ ジャキン 国立研究開発法人情報通信研究機構, 電磁波研究所電磁波応用総合研究室, 研究員 (00726325)
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| Co-Investigator(Kenkyū-buntansha) |
大井 隆太朗 国立研究開発法人情報通信研究機構, 電磁波研究所電磁波応用総合研究室, 主任研究員 (40443254)
奥井 誠人 国立研究開発法人情報通信研究機構, 電磁波研究所電磁波応用総合研究室, 主任研究員 (40450689)
山本 健詞 国立研究開発法人情報通信研究機構, 戦略的プログラムオフィス研究企画推進室, プランニングマネージャー (70402469)
涌波 光喜 国立研究開発法人情報通信研究機構, 電磁波研究所電磁波応用総合研究室, 主任研究員 (70726140)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Keywords | Light field display / Micro-lens array / Calibration / 3D rendering |
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| Outline of Annual Research Achievements |
1) Design and development of fringe-printer device was completed. Initially, preliminary experiments were conducted for deciding the parameters for fringe-printer. Then the design and development of fringe-printer was carried out using the decided parameters. The fringe printer was tested for resolution and aberration free performance. A computer program for calculation of the holograms and controlling the fringe-printer device was also developed. All the above together, will enable fabrication of transmission type holographic micro-lens array sheet with large size and wide view-angle.
2) Curved lens-array screens pose severe challenges in calibration of the 3D display system, due to its non-flat nature. A new algorithm and procedure has been developed to calibrate light-field display with cylindrical shaped lens-array screen. A display system with cylindrical lens-array screen of 10cm x 10cm with 100 x 200 micro lenses was built to test the method. The developed method was successful and the reconstructed images from the cylindrical lens-array sheet were crisp and sharp.
3) High-performance parallel computing routines were developed to render 3D animations at high-speeds. The developed routines use GPU for rendering and could achieve significant improvement in rendering 3D scenes. 3D light-field data of 4096 x 2160 pixels could be rendered in less than a minute.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
By the help of preliminary experiments a fringe-printer device capable of printing 800 line-pair/mm with a MTF of 50% was successfully designed, developed and tested. An algorithm has been developed that can calibrate a curved light-field display system with cylindrical lens-arrays. High performance parallel computing routines to synthesis light field data from 3D scenes has also been developed and successfully tested. With the above achievements, the project has progressed as planned.
Using the device and techniques developed above, we will be able to fabricate holographic lens array sheets of various parameters and test its performance as a curved display system. This is planned to be achieved in the second year of the project.
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| Strategy for Future Research Activity |
1) Fabrication of transmission type holographic optical elements using the already developed fringe-printer device will be done. Simple optical functions like grating, flat-mirror etc will be tested first to understand the performance and limitation of the printing device.
2) Once the parameters are well understood, micro-lens array sheets of dimensions 10 cm x 10 cm will be fabricated. For this, the already developed computer program will be used to calculate the hologram and control the printing.
3) A curved 3D display will be built using projector and fabricated lens-array sheet (in cylindrical form). The already developed method will be used to calibrate the display system. The display system will be tested for reconstruction properties like, viewing-angle, size of 3D scene, depth of 3D scene, blur characteristics etc.
4) Necessary modification and optimizations will be implemented in the fabrication step to improve the performance. At the end a large size display of 20cm x 20cm will be tested.
5) It is also planned to improve the performance further by using multiple projectors in the display. The spatial multiplexing technique will be used for this purpose. A new calibration method will be developed, that can align pixels from multiple projectors.
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Research Products
(6 results)
