Imaging Components, Systems, and Processing

Gradation representation method using binary-weighted computer-generated hologram

[+] Author Affiliations
Masato Fujiwara, Hiromitsu Araki, Hiroaki Niwase, Yuki Maeda

Kochi University, Graduate School of Integrated Arts and Sciences, Kochi, Japan

Naoki Takada

Kochi University, Science Department, Natural Sciences Cluster, Research and Education Faculty, Kochi, Japan

Shohei Ikawa

Kochi University, Faculty of Science, Kochi, Japan

Hirotaka Nakayama

National Astronomical Observatory of Japan, Center for Computational Astrophysics, Mitaka, Tokyo, Japan

Takashi Kakue, Tomoyoshi Shimobaba, Tomoyoshi Ito

Chiba University, Graduate School of Engineering, Inage-ku, Chiba, Japan

Opt. Eng. 56(2), 023105 (Feb 24, 2017). doi:10.1117/1.OE.56.2.023105
History: Received December 6, 2016; Accepted February 6, 2017
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Abstract.  We propose a simple gradation representation method for a reconstructed three-dimensional (3-D) image without controlling the brightness of the reference light. In the proposed method, we use multiple bit planes comprised of binary-weighted computer-generated holograms (CGHs) with various light transmittances. Binary-weighted CGH is generated by changing the white in the conventional binary CGH to gray. The light transmittance of a binary-weighted CGH is less than that of a conventional binary CGH. The object points of a 3-D object are assigned to multiple bit planes according to the gray level of the object points. The multiple bit planes are displayed sequentially in a time-division multiplex manner. Consequently, the proposed method realizes a gradation representation of a reconstructed 3-D object.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Masato Fujiwara ; Naoki Takada ; Hiromitsu Araki ; Shohei Ikawa ; Hiroaki Niwase, et al.
"Gradation representation method using binary-weighted computer-generated hologram", Opt. Eng. 56(2), 023105 (Feb 24, 2017). ; http://dx.doi.org/10.1117/1.OE.56.2.023105


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