Effective compression scheme for electro-holography based on vector quantization of point-light-sources

2019 Fiscal Year Final Research Report

• Project/Area Number: 19K21536
• Project/Area Number (Other): 18H06468 (2018)
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund (2019); Single-year Grants (2018)
• Review Section: 1001:Information science, computer engineering, and related fields
• Research Institution: Tokyo Metropolitan University
• Principal Investigator: Nishitsuji Takashi 首都大学東京, システムデザイン研究科, 助教 (70826833)
• Project Period (FY): 2018-08-24 – 2020-03-31
• Keywords: ホログラフィ / 電子ホログラフィ / 3次元映像 / 圧縮符号化 / 点群 / ベクトル量子化

Outline of Final Research Achievements

In electronic holography, which is capable of reproducing the most physiologically natural three-dimensional images, the amount of data to be transmitted and the huge amount of computation required to generate a computer-generated hologram (CGH) for image reproduction are important issues for practical use. In this study, we have developed a compression method for point clouds that can reduce both computational and transmission costs in a method that transmits point clouds, which are generally small amounts of 3D information, instead of transmitting CGH. Focusing on the simplicity of the CGH calculation process for a continuous point cloud in the depth direction, we transmit a vector quantized point cloud in the depth direction. The proposed method reduces the transmission rate by a maximum of 80-90% and increases the speed by a maximum of 110 times compared to a simple calculation method.

Free Research Field

光学，計算機工学

Academic Significance and Societal Importance of the Research Achievements

電子ホログラフィは高臨場感の3次元映像再生を実現できることから，遠隔地間で質感などを共有できるテレコミュニケーション技術としての期待が高い．このような技術が普及すれば，テレワークはもとより，医療，教育など，現在では対面が前提となっているシステムにおいて，同等のコミュニケーションをリモートで実施可能になり，移動や接触に伴う種々のリスク・コストを軽減できる．一方，通信容量や計算機性能の向上だけでは電子ホログラフィの要求性能到達は容易ではない．そのため，伝送・計算量削減を同時に考慮する本研究は，電子ホログラフィ実用化に重要な貢献をなすものであり，本研究に基づく今後の技術発展も十分に期待できる．